The BasX A3+ is a three-channel power amplifier that delivers 140 watts/channel into 8 Ohms and 200 watts/channel into 4 Ohms, all channels driven, with a rated THD+N of <0.02%, and an A-weighted S/N ratio of 112 dB. The BasX A3+ features a heavy-duty linear power supply, high-quality Class A/B amplification, transparent fault protection, and a trigger input and output.

The BasX A3+ offers both individual unbalanced RCA inputs and balanced XLR inputs for each channel, so it can be used with almost any preamp or processor, and any AVR that has preamp outputs. Audiophile grade five way speaker terminals accept banana plugs, spade lugs, or bare wire. These features combine to enable the BasX A3+ to deliver true audiophile performance and sound quality at an amazingly affordable price.

The BasX A3+ is the ideal choice to power a 3.1 channel system, to upgrade the front three channels of a surround sound receiver, or for anywhere where three channels of great sounding clean power are needed.

Circuit Topology

• The BasX A3+ is a three channel power amplifier. The BasX A3+ 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):
140 watts RMS per channel; 20 Hz – 20 kHz; THD < 0.1%; into 8 Ohms
200 watts RMS per channel; 1 kHz; THD < 1%; into 4 Ohms

• Power Output (two channels driven):
150 watts RMS per channel; into 8 Ohms
250 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): > 112 dB; ref rated power; (A-weighted)

• Minimum Recommended Load Impedance (per channel): 4 Ohms (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): 1.25

• Gain: 29 dB

• Input Impedance: 27 kOhms

Input And Output Connections

• Input Connections:
Unbalanced (RCA); one each per channel
Balanced (XLR); 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
• 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 A3+ 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:
25 lbs (unboxed)
31 lbs (boxed)

Downloads

User Manual