Audio Database

MA-7
Commentary

Monaural power amplifier equipped with MOS FET output stage.

Pure class A operation of output 30W (8 Ω) and class AB operation of output 120W (8 Ω) can be switched by the switch on the back panel.

The phase inversion circuit for bridge connection is built-in, and BTL connection can be easily made with the change-over switch and attached cord.
In the BTL connection, two MA-7 units are connected in series to realize high power of 350W (8 Ω).
In addition, we have improved sound quality by canceling distortion components from two amplifiers and by eliminating harmful components caused by ground potential because no load current flows through the ground line, thereby realizing clean earth.

The input sensitivity is set to 1 V to enable direct input from CD players.

An inverted switch is mounted on the rear panel to invert the output phase by 180 ° without changing the connection of the speakers.
By controlling the phase of each band, you can fine-tune the sound connection near the crossover.

Model Rating
Type Monaural power amplifier
Rated output Class AB : 120W (8 Ω)
Pure Class A : 30W (8 Ω)
Total harmonic distortion factor Not more than 0.008%
Frequency characteristic 1 Hz to 100 kHz + 0 -1dB
Input Sensitivity / Impedance 1.0V/56k Ω
Damping factor 250 or More (8 Ω)
Signal-to-noise ratio (IHF-A) 120dB
Power consumption (Electrical Appliance and Material Control Law) 150W
External dimensions Width 208x Height 163x Depth 359 mm
Weight 10kg