SPA-4
Facilities
Inputs ​ Stereo line level, stereo balanced
Outputs Stereo pair multi-way locking binding posts

Masterclass SPA-4 Stereo Power Amplifier & MPA-4 Balanced Mono Power Amplifier
The popularity of the Masterclass series has resulted in over seventeen years of continuous production. Offering an excellent price/performance ratio it is easy to see why it remains so successful. With an abundance of headroom, the MPA-4 mono power amplifiers deal easily with heavy complex music, allowing the low level detail to be heard clearly and accurately. Boasting a fully balanced circuit design, it can be the engine room of a fully balanced hi fi system.

The SPA-4 is a stereo version of the MPA-4 and uses the same class A circuit. The only differences are power output and the additional flexibility of both single ended and balanced inputs. Not every music lover can accommodate two substantial power amplifiers in their listen space, so a single SPA-4 could be the solution. One of the noticeable abilities of the SPA-4 is how well it works with smaller loudspeaker designs as well as large ones. Control and soundstage are two key elements of the SPA-4 making it a fine power amplifier.

MPA-4
Facilities
Inputs ​ Mono balanced
Outputs Single pair multi-way locking binding posts

Specifications
Input Sensitivity 1Volt for full output
Power output 165 Watts into 8 Ohms both channels working
Frequency response +/-0dB 15Hz-30kHz
Bandwidth -3dB points 2Hz-200kHz
Signal to noise >85dB
Gross weight (packed) 25kgs x 2
Dimensions 250 x 430 x 360mm (hwd)

Specifications
Input Sensitivity 1Volt for full output
Power Output 75 Watts into 4 Ohms both channels working
Frequency Response +/-0dB 15Hz-30kHz
Bandwidth -3dB points 2Hz-200kHz
Signal to Noise >85dB
Gross Weight (packed) 25kgs
Dimensions 250 x 430 x 350mm (hwd)