BasX A4

Circuit Topology
The BasX A4 is a four channel power amplifier. The BasX A4 combines classical audiophile amplifier architecture, based on a heavy-duty linear power supply, and a carefully designed high current short signal path Class A/B output stage, with advanced microprocessor-controlled monitoring and protection circuitry, to deliver superb sound quality at a truly reasonable price.
Audio Specifications
Power Output (ALL channels driven):
100 watts RMS per channel; 20 Hz – 20 kHz; THD < 0.1%; into 8 Ohms.
130 watts RMS per channel; 1 kHz; THD < 1%; into 4 Ohms.
Power Output (two channels driven):
120 watts RMS per channel; into 8 Ohms.
175 watts RMS per channel; into 4 Ohms.
Power Bandwidth (at rated power; 4 Ohm - 8 Ohm load): 20 Hz to 20 kHz (+ / – 0.02 dB)
Broad Band Frequency Response: 10 Hz to 80 kHz +0/-1.8 dB
THD + noise: < 0.02% (A-weighted); ref rated power
Signal to Noise Ratio (8 Ohm load):
> 115 dB; ref rated power; (A-weighted).
Minimum Recommended Load Impedance (per channel): 4 Ohms
(which equals one 4 Ohm load or two paralleled 8 Ohm loads).
Damping Factor (8 Ohm load): > 500.
Input Sensitivity (for rated power; 8 Ohm load): 1.2 V.
Gain: 29 dB.
Input Impedance: 27 kOhms.
Input And Output Connections
Input Connections: Unbalanced (RCA); one each per channel.
Speaker Output Connections: Audiophile grade 5-way binding posts.
Trigger:
Trigger Input: 5 – 12 V (AC or DC); <10 mA input current required.
Trigger Output: 12 VDC; can drive any load up to 120 mA.
Power Requirements
115 VAC or 230 VAC @ 50 / 60 Hz (automatically detected).
Front Panel Controls and Indicators
Standby: push button.
Status LEDs: one per channel; blue.
Status LEDs change to red to indicate a fault condition.
Standby LED: amber.
Rear Panel Controls
AC Power switch: rocker switch (switches AC main power).
Status LEDs switch: disables front panel Status LEDs.
Protection
The BasX A4 is protected against excessive operating temperature, shorted speaker connections, ground faults, and other common fault conditions.
Mechanical
Dimensions:
17” wide x 4” high x 15-1/2” deep (not including connectors).
21-1/2” wide x 8” high x 21” deep (boxed).
Weight:
26 lbs (unboxed)
32 lbs (boxed)