The BasX A4 is a four channel power amplifier that delivers 100 watts / channel into 8 Ohms and 130 watts / channel into 4 Ohms, all channels driven, with a rated THD+N of < 0.02%, and an A-weighted S/N ratio of 115 dB. The BasX A4 features a heavy-duty linear power supply, high-quality Class A/B amplification, transparent fault protection, and a trigger input and output. High quality industry standard unbalanced RCA inputs enable the BasX A4 to be used with almost any preamp or processor and audiophile grade five way speaker terminals accept banana plugs, spade lugs, or bare wire. These features combine to enable the BasX A4 to deliver true audiophile performance and sound quality at an amazingly affordable price.

The BasX A4 is the perfect solution if you need a high quality amp to power your Dolby Atmos and DTS:X height channels. It is also an excellent choice to power your surrounds if you're building a new system and you've already committed to a more powerful amp, like our XPA-3, to power your front channels or to power two pairs of zone speakers.

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):

• 100 watts RMS per channel; into 8 Ohms

• 175 watts RMS per channel; into 4 Ohms

Power Bandwidth (at rated power; 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 (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)

Downloads

Download Product Manual