The 250.4 is a Class-H switching power amplifier dedicated to fixed installations. It features four independent 250 W channels driving both 4 Ω loads and 70 V/100 V lines.
Unlike most of 100 V amplifiers, the 250.4 does not use any output transformer, so the signal fed to the speakers is pure and natural. In addition, it uses a Class-H technology which gives a significant loss of weight and a gain of efficiency.
One of the most popular applications is having two independent zones including low impedance loads on channel 1 and 2 for proximity speakers, and 100 V line on channel 3 and 4 for long distance transducers.
All connectors and settings are located on the rear panel. Control Leds on the front panel give a real time status of the amplifier.
A switchable band-pass filter can eliminate hum and noise on the 100 V line when necessary.
The balanced inputs features XLR connectors and the outputs got screw terminals.
A time delay protects the loads from current transients when the power supply is switched on. The amplifier is also protected against overvoltage, short circuit and overheating.
||250W x 4
|THD (1 kHz/-3 dBv)
|S/N Ratio (Ref. 1kHz, A-Weighted)
||DUAL / MONO (Ch1 & 2) and (Ch3 & 4)
|Crosstalk (Below Rated Power)
|Input Level (balanced, 1 kHz)
||0 ± 1.5 dBv
|Input Level max. (balanced, 1 kHz)
||20 dBv ± 1.5 dBv
||(L/H Filter OUT) 20Hz~20kHz ±1dB /
(L/H Filter IN) 200Hz~10kHz ± dB
||Inputs: XLR balanced
Outputs: Screw terminals
||AC: 115~230V 50/60Hz
|Dimension (W x D x H)
||483 x 353 x 88.5 mm (19” x 13.9” x 3.5”)