Bryston 4B3 Cubed Amplifier


4B³ förstärkare
Bryston 4B³ är en stereokanalförstärkare med dubbla kanaler som är internationellt välrekommenderad som passar även till de finaste och mest sofistikerade ljudsystemen. Det är för närvarande vår mest populära Cubed Series-modell.

1 998kr/mån

Så funkar leasing

  1. Leasing erbjuds företag på köp från 2 400 kr till 2 000 000 kr.
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Räkneexempel för varukorg 90 000.00 kr

1 998 kr per månad i 48 månader. Restvärde 9 000 kr. Uppläggningsavgift 450 kr.

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Power Capabilities:
300W into 8Ω
500W into 4Ω
900W into 8Ω (Bridged Mono)

Active extremely low distortion input buffer
Balanced and Single Ended audio inputs
Selectable gain at 23 or 29dB
Regulated power supplies to all voltage gain stages
Independent power supplies for each channel
Convection cooled and housed in a fully aluminum chassis.
No fans or other moving parts
Bridging switch configures amplifier into a single 900W Channel
Harmonic Distortion: ≤.005% from 20Hz to 20kHz at 300W
Noise below full output: -110dB single ended, -113dB balanced
Slew Rate: >60V/µS
Power Bandwidth: .5Hz to >100kHz
Damping Factor: >500 at 20Hz (8Ω)
Switchable Gain: 23dB or 29dB
Available with silver or black faceplate (3U + .55”)
17” (without handles) or 19” (with handles) faceplate available (non-rack mountable)
Rack mountable Pro Edition available in black (see Cubed Pro for more details)


Bryston Ltd.

Bryston Ltd. has been designing and manufacturing state of the art specialty electronics to both the consumer and professional audio marketplaces for over 35 years.
Bryston has a major commitment in producing the most accurate and reliable product available by maintaining an extensive research and development division which is constantly looking for ways to improve the performance, value, and reliability of our products.

Bryston engineers are never constrained by design costs for functionality. On the contrary, Bryston challenges their engineers to create the finest products they can; to source and use the best components; to move Bryston equipment ever-closer to perfection, while maximizing performance and reliability.

Following in the fine tradition of artisan craftsmanship worldwide, every audio component is handcrafted by people who take tremendous pride in building the very best. Each component is hand selected and installed, every wire is cut and bent by hand, and every connection is hand soldered.

In the consumer market Bryston manufactures state of the art audio electronics intended to provide the owner with the most musically accurate and reliable performance available. In the professional market Bryston offers amplifiers for recording studios, radio and television broadcast facilities, and sound reinforcement applications such as stadiums and arenas, etc.

Each of Bryston’s fully assembled products is extensively tested before shipment. During 100 hours of continuous testing, Bryston amplifiers are monitored through a range of input cycles and thermal stress levels to duplicate a broad spectrum of operational loads. If any failures occur, Bryston will catch them during the manufacturing process, before you begin using the product.

Bryston’s dedication to creating the most reliable products is clearly evident in their 20 year analog and 5 year digital warranty.

Bryston products allow you to enjoy a generation of sound, music, and incredible performance. Bryston is based in Peterborough, Ontario, Canada, just northeast of Toronto, and is sold through over 150 dealers in North America and 60 countries worldwide.


MARCH 2018

Canadian Power

Bryston amplifiers are living legends. They represent high end sound combined with famous stamina, embellished with a 20 year warranty.

Yes, I admit it I have been enthusiastic about amplifiers forever, but I definitely do pay attention to price and performance. In fact with efficient loudspeakers I appreciate it when, after numerous relevant listening trials, and even public demonstrations on the “World of HiFi”, when reserves are available and the amp does not continually work at its threshold. The latter was and is not a problem with the products of the Canadian Brand Bryston because they represent, likewise both in the professional as well as in the high fidelity area, the highest delivery and can-do qualities, as well as “audiophile punch.” I like to call it “Quality with a Bang.”

The ideal amplifier is a straightforward “wire” which amplifies but otherwise does nothing to subtract or add anything to the signal. Period. And as a synonym for this in this industry one has seen the name Bryston for four decades. However this is not my first Bryston contact, but nonetheless my first test for which I have downright jumped to the front of the line because I always found the classics, the 3B and the 4B (see box) more than interesting, in fact desirable. In due course the possibly record-breaking 14BSST, the holder of the performance record of

STEREO magazine, was already a sensation.

An Honorable Family

Now I have it in front of me, the youngest reincarnation of the 4B and the matching second largest preamplifier from Canada, the BP-17, both in the “cubed” version “3.” And much has happened. They appear, perhaps due to the altered living ambience of the well
situated customer base, not only quite different, but also under the hood it appears worthy of exhibiting rather than pragmatic. It is discernable that the engineers specifically did everything to reach “the very best”, components, cabinetry, and workmanship are indeed of the finest. The preamp is totally symmetrical and completely implemented in manufacturing friendly SMD technology, which leads to extremely short signal paths. The apparently available plug-in positions on the main circuit board for phono and DAC options are noticeably vacant, so therefore we have the basic version in front of us, which is available for 4,490 Euro, but which can naturally also be retrofitted making it future-proof and budget friendly. Long life cycles and the 20 year warranty speak for themselves, something will only be altered when it makes sense, and when one is convinced about it.

The Bryston power amplifier, in classic Class AB power amp concept, believe it or not, is dominated and supplied by two huge stacked toroidal transformers. Okay, there is an unwritten law that the quality of an amplifier can be judged by the quality of the power supply, which here in the 4B3 can certainly be categorized as extraordinarily ambitious. The specified 300 Watts into 8 Ohms certainly acknowledges this, but it’s actually 311, and 500 Watts into 4 Ohms, and for short periods it can mobilize even 624 Watts, per channel of course. The load resistance slowly

starts to glow here. The amplification factor is switchable between 23 and 29 dB, and additionally the 4B3 amp can be bridged. The innovations of the “Cubed” generation are embodied in an especially sophisticated negative feedback concept and once again improved suppression of HF, common mode, and negative power supply impact.

Modular High-tech Preamplifier

The completely symmetrical Class A preamplifier is the result of over two year meticulous development based on the BP-17, combined with the best analogue technology of Bryston, among which are special superior and patented input buffers (amplifier components) in the entire “Cubed” array, as well as a new symmetrical volume control of extreme precision and channel uniformity, while borrowing from

the B-135 amplifier and the SP-3 processor. The development team around CEO and co-owner Chris Russell honored the deceased co- developer Dr. Ioan Alexandru Salomie by naming the input circuitry “Salomie” after him. Although the applicable DAC module

is not built into our test sample, Bryston attaches importance to strict separation of current and ground separation in analog and digital circuitry.
Earlier Bryston components, naturally especially the 4B, had the reputation of providing fabulous sound, in durable irrepressible straight forward form; the components were uncomplicated and appropriate like a hammer. They had a certain wood cutter’s charm, and as an academician who knows how to fell a tree, because he’s done it already, without meaning it disrespectful, of impressive simplicity, and reaching this is indeed a complex art. With the actual, modern, and extensively reconfigured generation this is only somewhat the case. Perhaps one notices it during the turn-on ritual of the power amplifier, which is not quite simple and sometimes only succeeds after getting used to it.

Our measuring laboratory as well as our photo studio specifically required editorial support in order to turn on the extremely high-performance power amplifier, although both of these deal daily with amplifiers. This is due to the built-in circuit breaker which, contrary to expectations, is not a normal main switch and should be left continually switched on. It is responsible for a 20 second delay for the next try as well as providing a self-diagnosis sequence, a check for the connected line voltage, and also for the amplifier stages, before activating the amp, while additionally requiring the activating of the front switch. Surprisingly, in turn, the preamp does not feature a “hard” power switch at all. That is not necessarily self-explanatory, but only problematical once, and quickly becomes a matter of course for the owner. In any case the electrical protection of the components is perfect. And different from many other amplifiers, the Bryston amps arrived with marked and even matching net phase which speaks for a thought-out and very constant manufacturing organization.

In our STEREO listening room the Brystons unleash a kind of incredible elemental force whose pronounced rhythm, texture, and aesthetics is

stunning with closer listening. At first the bass attracts attention, then the combination takes the Aurum Vulkan speakers in its grip, and elicits profound depths as well as crisp impulses of exceptional quality. Although the rest of the spectrum may be a bit less spectacular, it is completely praiseworthy, and provides enormous clarity, plasticity, and accuracy. I’ll be damned if these aren’t simply the best all- around amplifiers about which the demanding listener, at still affordable prices, dreams about!

The new Bryston amplifiers, for me the superstar is the power amp, which comes very close to the top references, is with its classic construction uncompromisingly modern,

and not despite, but especially as before, synonymous for reliability and long life expectancy. Soundwise with their tonal naturalness, the riveting dynamic character, the consistent unerring effect- free neutrality, and the tranquility in the sonic image, these Bryston amps belong to the absolute upper chamber of international amplifier manufacturing.

This also means that they project the emotions of an Amanda McBroom into a room if they are indeed in a recording, and in no way creating some and adding them. Consequently they literally omit nothing, the thoroughness of revealing embedded detail is astonishingly good, accompanied by thrilling rhythm, which is rare enough, and then only available from fast AND bass efficient amplifiers.

They are an exemplary sovereign tower of strength, which when required are capable of unleashing unexpected explosive enormous power; likewise admirable as well as endearing. Because for me they combine in a unique manner professional as well as audio qualities, and should absolutely be listened to when one is thinking about the acquisition of ultra-high karat amplifiers. The legend surrounding this brand, Bryston, is indeed absolutely true and justified, since it has been available for decades, a treasured entity and an augmentation to the top offers. Superb.

Tom Frantzen.


Bryston Ltd. in Peterborough, Ontario, Canada, is a 1962 founded industrial enterprise which originally dealt with medical technology, but since the middle of the 1970 years devoted itself especially to the manufacturing of amplifiers for professional as well as audiophile purposes. The reliability of the brand is renowned. Every completed component undergoes a 100 hour test and warm-up procedure, and only components which survive this are delivered, which among others is the reason for the unusual 20 year warranty. The key product of the Canadians was, is, and will undoubtedly continue to be the 4B stereo power amplifier which for generations has always been improved, developed further, and lovingly cared for. While we see the newest generation 4B3 in the above test, on the right one can find the photo of the original version of 1976, a difference of over 40 years… Of course time did not stand still, the technical advances led to higher performance, greater bandwidth, more rapid signal processing, and better signal to noise and distortion behavior, thereby achieving higher dynamics and better sound, although as before, the older Brystons remain extremely robust amplifiers. Better successors, as is well known, don’t change this. On the contrary, the new component generation will continue to perpetuate the successful Bryston saga on the highest level.

Translated from the German by Peter Ullman

Test: Pre amplifier and power amplifier combination

Test: Bryston BP17 Cubed and Bryston 4B Cubed Power Amp Combination
By MARTIN MERKENS | May 16, 2018

Bryston – a name like the echo of thunder! In my “HiFi-youth” (over 30 years ago) one referred to the, at that time young, firm in one breath with American heavyweights like Threshold or Mark Levinson. Now the brand new Bryston BP173 preamp stands in front of me and is most anxious to demonstrate, together with my Bryston 4B3 power amp which I have been using for almost a year, what an actual Bryston combination can achieve.

So it goes.

Threshold sank into insignificance after the departure of Nelson Pass who started his own firm with Pass Labs. Mark Levinson drifted pricewise to – let’s say – “very ambitious” domains. With one leg firmly embedded in the professional arena, Bryston did not have to go along with the trends and modes of the High-End, nor take the route to straight Cost-No-Object-HiFi.

Bryston remained down-to-earth. The price was that the Canadians suffered presence in the consumer area, and that they disappeared from the radar of many HiFi enthusiasts, and also from mine.

My first reacquaintance with Bryston took place a few years ago. I was allowed to test loudspeakers for a magazine. As a working tool I had among others a Bryston 4BSST2 professional power amp at my disposal, and the more I worked with the rather unobtrusive power amp, the more different loudspeakers I connected to it, the better I liked it. The “thing” stayed away from any kind of interference, played perfectly with every kind of loudspeaker, and to the last detail produced the characteristics of each of the different speakers.

Thereby I always had the impression that each speaker was the soundwise limiting factor, never the amplifier, and moreover the Bryston amp painlessly forgave rough handling. A “short circuit” while reconnecting a loudspeaker cable? No problem. Frequent turning On and Off (after I found the power switch) it did no bear a grudge. The 4BSST2 remains in fond memory as a soundwise superior, ultra reliable workhorse.

hen my colleague Jörg Dames tested the large Bryston mono 7B3 amplifiers. At this time I made the decision to acquire the subsequently released successor to the 4BSST2 amp, the 4B3 amplifier which has now been in use by me for some time. When the time came to test the new Bryston BP173 preamp together with the 4B3 amp, I needed very little coaxing.

I had a small controversy with my colleague Jörg Dames whether Bryston components look better in silver or black. He believes in silver, I believe in black. The consequence is that my Bryston 4B3 is black while the test sample of the 17BP3 came in silver, which is apparent in the photos of this test.

Let’s take a closer look at the preamp: The front of the BP173 consists of a 6.2 mm thick aluminum front panel. That thickness suffices to accommodate a few elegant curvatures and chamfers – especially because it is a short U-profile – so that the upper and lower edge is larger, and the front appears to be thicker than it really is.

The rest of the cabinet has the correct color (black) and consists of stable sheet metal. It is very substantial, looks absolutely upscale, but is far removed from the – at least partially worthy of discussion – material battle of other high end components. I like that.

Despite that, the Bryston BP173 preamp is able to exhibit a decent weight of five kilograms due to its inner parts, and especially due to its power supply. The toroidal power transformer that Bryston uses here would stand in good stead in many a power amplifier. Otherwise there is much air space in the cabinet.

This is primarily due to the printed circuit boards being assembled with SMD components. This, in turn, assures the shortest signal paths and requires little room. There is so much room that Bryston offers an optional MM phono board and a DAC board, which are installed on the main printed circuit board, for the BP173 preamp.

The labeling for the additional inputs, specifically the configuration changes to the available inputs which accompany the optional boards, are already printed on the front panel, which can at first be confusing.

What else is there to report? That the Bryston BP173 preamp has a regulated preamp output besides five single ended outputs, and one unregulated Rec-Out output.

Beyond this there are two balanced inputs, and two balanced preamp outputs. Of course there is also a remote control (BR2: 485 Euro) which controls, as needed, not only the preamp but also other Bryston components.

This makes the remote control a bit confusing, especially because the captions on the inputs do not agree with those on the front of the preamp.

The 4B3 power amplifier is of a different caliber. The front consists of a massive 12.7 mm aluminum front panel, however this material is not an end in itself because the 4B3 amp is also available in a pro version with a wider front panel for installation in a 19 inch rack.

Because the front panel must support a major portion of the 26 kilogram which the amplifier weighs, its material thickness is certainly justified. In the 4B3 amp the power supply also contributes a considerable part of the overall weight. Two giant toroidal transformers, which for reasons of space saving are located on top of each other, also add substantially to the overall weight.

Not only the toroidal transformers, but also the 2 x 300 watt into 8 ohms output stage exhibits a neat double mono construction. In contrast to the preamp things are quite snug here. Between the large heatsinks located on the sides, there are transformers, many filter and buffer capacitors, various circuit boards which are loaded partially with conventional parts and wires and partially with SMD parts.

Besides the actual output stages there is a board with an elaborate current limiting circuit in order to prevent fuses from blowing when the amplifier is switched on, as well as a few boards for control and regulation circuits. As a professional component the 4B3 amp is built for extremely high operational reliability.

The professional requirements also manifest themselves on the rear of the 4B3 amplifier. The Bryston amp accepts single ended signals via two RCA inputs, while for balanced signals there is a pair of combination inputs which will accept XLR plugs as well as 1⁄4 inch phone plugs.

Naturally there are also loudspeaker terminals as well as further connections with which the amp can be remotely controlled. Small rocker switches facilitate switching between single ended and balanced input, and for choosing the amplification factor (26 dB for a source with balanced output, 29 dB for a source with single ended output) or for operating the amp in balanced mode, in which case it delivers mono 900 watts into 8 ohms.

Incidentally the large switch next to the left loudspeaker terminal is not the main switch, but a “Master Circuit Breaker.” It must be set to “ON” when one plugs in the amp.

Then it conducts a small individual test. In the meantime the LED on the backside blinks green, when it jumps to red, the 4B3 amplifier can be turned on with the main switch on the front.

The Bryston BP173 preamp is taking the place in my HiFi rack of my EAR Yoshino 868 preamp, not the newest semiconductor technology of the year 2017, but rather tube technology appropriate to the seventies, incidentally also a preamp of a studio supplier.

The Bryston 4B3 already had a fixed place in my HiFi rack. The first measures from the Bryston combination (BP173 and 4B3) make clear that the Canadians follow very modern sound ideals. Tonally the Bryston combo shows itself to be absolutely neutral. I am certain that under this aspect one cannot add any characteristic.

It is neither “warm” nor analytically “cool”, rather in matters of tonality so little is mixed in as one would hope from studio equipment. Apart from the tonality the BP173/4B3 combination does display a few significant characteristics – further down below I will illuminate the 4B3 separately, which, so much I am allowed to reveal, qualifies as something extraordinary.

The Bryston BP173/4B3 Combination in Soundcheck

So let’s go to the combination: I start my listening session with Paula Morelenbaum’s album Telecoteco (listen to it on Amazon). The Bryston components reveal the track “O Samba O E Tango” with such energy that it’s simply thrilling. Foremost the speed and dynamics of the synthetic bass runs impress me.

Then there is Madonna, American Life (listen to it on Amazon), simply the test track for crisp synthetic bass. The peculiar abrupt stops of the lower tones, which characterize some of the collected tracks here, such as “American Life” or “Die Another Day”, are brilliantly reproduced by the Canadian amplifier duo. The representation comes across crisply controlled.

However there are not only synthetic basses, so why not once again (light) classics? The music for the ballet Le Sacre Du Printemps offers a broad spectrum of instruments. I am going back to the recording of Pierre Boulez with the Cleveland Orchestra (listen to it on Amazon).

Plucked contrabasses celebrate rapturous ecstatic activities, forcefully called to order and to stop by the tympanis. Once again the Brystons transport the dynamics of the whole in an impressive manner. Ok, I have heard the whole already a bit mightier and urgent.

However from an austere pragmatic viewpoint that is absolutely correct, the Bryston combination adds nothing artificially, nor do I have the impression that it withholds anything.

The next discipline is the midrange where according to my experience the reproduction of the most natural of all “musical instruments” the human voice is most critical. Despite spring breaking out, I feel a bit in apocalyptic mood, for which Lucinda Williams is quite appropriate.

Incidentally she increasingly withdraws from the influence of the music industry with its unbearable profit maximization for artists and consumers, and produced her last albums under her own label.

And look at that: for a reasonable price it is possible to offer superbly produced vinyl, which at the same time is accompanied by a code for the download of the music as a highly resolved wav-file.

Since the Bryston BP173 arrived without the phono option my Linnenberg Teleman DAC is put to use and takes on the digital data of the album The Ghosts of Highway 20 (listen to it on Amazon). The understated brittle voice of Ms. Williams comes near, intensive, raw, and melancholic. That gets under your skin.

Electric guitars and percussion accompany the song – on this album for my taste a bit too smoothly, but the amplifier combination can’t be blamed for that. On the contrary everything is extremely listenable – from the details of the voice, over the playing of the electric guitars, to the percussion, the Bryston combo satisfies across the entire line.

Together with my EAR- Yoshino 868 the Bryston 4B3 amp reproduces the voice of Ms. Williams here and there still more emphatically, however the tube preamp is tuned a bit warmer and therefore has a marked foible for voices. Therefore it cannot be considered quite as neutral as the Bryston BP173 preamp.

However at both edges of the frequency spectrum, as well as at the upper end, in the heights, the pure Bryston combination performs more clearly than with the EAR-Yoshino 868 in front.

Here the character of the Canadians is similar as in the basses, very clear, controlled and precise, and at the same time they effectively make an impression after every tone. Where brushes are on cymbals, i.e. steel meets bronze alloy, the Bryston BP173 and the Bryston 4B3 combo leave not a miniscule doubt what is going on, presume nothing, and truthfully follow the decay of every beat.

In reference to spatiality, the Bryston BP173 and 4B3 combination moves the stage quite close to the listener, one sits rather near the front. At the same time they present the stereo panorama comparatively wide, and sort the goings-on very well. Ms. Williams stands close to me on the stage, her companions stand with a bit of space right and left next to her. Furthermore the percussion is only moved a bit back. Generally the room
expands more in width than in depth, whereby also the spatial perspective functions cleanly, however the overall room does not go too far back.

Primus inter pares: The Bryston 4B3 Amplifier

That the described character of the Bryston combination primarily refers to the BP173 preamp is shown by the Bryston 4B3 amplifier in connection with other partners. If, for example, the Linnenberg Teleman DAC, which is equipped with a high quality volume control, takes over the control of the amplifier, it becomes clear that the Bryston 4B3 is the secret star of the combination.

With the Linnenberg Teleman DAC the bass maintains in comparison to the BP173 its exemplary control and precision but gains in substance and force. Especially when it goes into the deep bass, an increased authority is noticeable, but at the same time the Bryston 4B3 amp has absolute control of the loudspeakers.

The heavy 300-mm- woofer, part of the Spendor Classic 100, which I sometimes connect for tests, is controlled perfectly by the 4B3 and succeeds in dragging the perceived infrasonic synthetic basses of James Blake cover version of the Feist Songs “Limit to our Love” (Album James Blake) (listen to it on Amazon) into my listening room without anything acting rudimentarily or uncontrolled.

The large chassis do carry out visible thwacks, and I am waiting for my neighbors to come running into the street because they think the house is falling down.

On the other side the Bryston 4B3 also gets along quite well with light horn loaded broad band speakers like Tune Audio Prime, which is unusual. Usually one connects such loudspeakers to single ended 300B amplifiers which offer almost no damping factor, so that the already tight speakers have enough room to “freely” perform and sound more substantial.

The Bryston 4B3 amplifier masters the art of getting along with subwoofers of any kind, while not sounding swaggering, anemic, but simply always right.

This “right” also applies to other frequency domains. In interaction with my EAR Yoshino 868 tube preamp the Bryston 4B3 amplifier demonstrates how fascinating voices can sound.

The 4B3 amp provides the finest details of articulation and convinces both with the throaty voice of Buika (Album Nina De Fuego) as well as with the rhythmically accentuated Song of Ulita Kanu (The Moon on My Doorstep) or with Leonard Cohen’s creaking speech song (Live in London).

In the process the Canadian 4B3 amplifier supplies details, rhythm, voice formation, and articulation – simply everything respective to the voice – incredibly plastic and intensive. Zaz album Zaz (listen to it on Amazon) makes clear with the opener “Les Passants” that the Bryston 4B3 amp also performs incredibly fine within the high frequency range.

The glockenspiel at the beginning of the selection was recorded almost painfully high as well as loud – but nonetheless through the 4B3 amp it is acceptable, and sounds exceptionally clear and clean.

Also in matters of spatiality the Bryston 4B3 amplifier with its connected electronics, respectively the loudspeakers, scales, i.e. performs very well. With the Linnenberg Teleman component the reproduction is less wide, but deeper and very plastic, between the individual tonal sources there appears to be more air.

Test Report: Bryston BP173 and 4B3

The new Bryston BP173 is a preamp for pragmatists. It sounds clear and straight, and yet tendentially unpretentious-austere rather than ethereal-subtle. At the same time it does not favor any frequency range – neither tonal, nor does it impart specific ranges more resolution, fine dynamics, or whatever.

The BP173 preamp always displays the same high precision in the bass, in the middles, and in the heights. The spatial representation goes more easily into the width, is very precise, and a sense of depth is a bit less pronounced. That is convincing and appropriate for the clear, immediate, yes, direct character of the BP173 preamp.

The 4B3 power amplifier is for me the absolute test highlight. Since this is after all my “daily work power amplifier”, I was able to collect experiences with different loudspeakers as well as with diverse electronics connected to it. Besides the highest tonal neutrality, I can attest the Bryston 4B3 amp especially high “transparency.”

One is precisely aware when electronic components attached to it are changed, and conversely on the other side the 4B3 amp reliably divulges everything from the connected loudspeakers. The 4B3 amplifier is highly efficient, stable with any load, and is certainly appropriate for any dynamic excesses one wants to stage in the four walls of one’s home.

On the other side the Bryston 4B3 amp is extremely finely resolving, finely dynamic, and incredibly “fast.” In the bass region it offers extreme control, and also masterfully drives the cones of heavy subwoofers, however it gets along equally well with broadband speakers, which it does not “over control.”

In the middle the Canadian performs cleanly, transparently, powerfully, and highly resolving. There also appear to be no limits in the higher ranges. Whoever owns this amplifier is able to change and exchange many components of her/his audio system – the 4B3 power amplifier will undoubtedly be the last component that one will want to change in order to achieve some improvement.

I am actually of the opinion that the Bryston 4B3 amp in sum is actually one of the best power amplifiers in the market – at the very least when it comes down to an amplifier that should behave in the ideal case like an “amplifying wire”, i.e. as neutral and transparently as possible. Grandiose.

Bryston 4B Cubed Award – Australia


Ytterligare information


Silver, Black


Power Capabilities:
300W into 8Ω
500W into 4Ω
900W into 8Ω (Bridged Mono)

Active extremely low distortion input buffer
Balanced and Single Ended audio inputs
Selectable gain at 23 or 29dB
Regulated power supplies to all voltage gain stages
Independent power supplies for each channel
Convection cooled and housed in a fully aluminum chassis.
No fans or other moving parts
Bridging switch configures amplifier into a single 900W Channel
Harmonic Distortion: ≤.005% from 20Hz to 20kHz at 300W
Noise below full output: -110dB single ended, -113dB balanced
Slew Rate: >60V/µS
Power Bandwidth: .5Hz to >100kHz
Damping Factor: >500 at 20Hz (8Ω)
Switchable Gain: 23dB or 29dB
Available with silver or black faceplate (3U + .55”)
17” (without handles) or 19” (with handles) faceplate available (non-rack mountable)
Rack mountable Pro Edition available in black (see Cubed Pro for more details)

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