Real Sound Amplifiers RSA-F33EX, RSA-M3EX and RSA-V1EX

Real, new-generation class-D amplifiers with latest highly accurate PWM switching devices

By employing the latest developed class-D amplifier devices, power MOS-FET achieves ideal highly accurate current switching in the power stage, and high-voltage gate driver IC with excellent time-axis control maximizes the ultimate PWM switching. The exceptional performance of the class-D devices ensures ultimate real-sound with quality damping in the mid to low ranges even when driving low-efficiency speakers. Furthermore, the sweet and rich tonal character in the mid to high ranges of the amplifier is almost like the tone of the best triode tube amplifiers.

Superb power source of RSA-F33EX / RSA-M3EX / RSA-V1EX ensures the real musical sound

In order to maximize the potential of the unprecedented high performance of this amplifier (power utilization in the power stage at maximum output; 96%), we daringly employed a classical and very simple plus/minus power source composed of minimal numbers of high quality components, such as only transformers, bridge-diodes and capacitors.

Specially selected parts of low-pass filter contribute to the Real-Sound

The sound of this class-D amplifier owes a lot to the individual parts of low-pass filter in the final stage of the amplifier. The capacitor and the coil employed for the low-pass filter were custom-ordered after careful listening tests and guarantee the excellent musical sound of RSA-M3EX.

Wooden base-chassis and insulators to realize rich and beautiful instrument-like sound

In an unusual endeavour for an audio amplifier, natural wood was used for the base chassis and insulators.

 Read the review from Jeff's Place here

6moons review on the M3EX here and the V1EX here







Maximum output

120 W × 2 (4Ω), 90 W × 2 (6Ω), 
60 W × 2 (8Ω)

100 W × 2 (4 Ω), 75 W × 2 (6Ω), 
50 W × 2 (8Ω)

Frequency response

10 Hz - 30 kHz ±1dB (6Ω, 1W)

Harmonic distortion ratio

0.02% (at 1 kHz, 80% output)

Input sensitivity, gain

300 mVrms, 37.3 dB (at MAX volume, 6Ω, 1kHz, unbalanced input)

Line input terminals

XLR input: 1 RCA inputs: 3

Speaker terminal


Power voltage

220 V AC, 50 Hz

Electrical consumption

With no signal: 15 W, during maximum output: 215 W (8 Ω, 100 Hz)

With no signal: 15 W, during 
maximum output: 180 W 
(8Ω, 100 Hz)

External dimensions

450 mm (width) × 130 mm (height) 
× 422 mm (depth)

440 mm (width) × 125 mm (height) 
× 414 mm (depth)

440 mm (width) × 120 mm (height) 
× 414 mm (depth)




14.5 kg