The BasX A7+ is a seven-channel power amplifier that delivers 90 watts per channel into 8 Ohms and 125 watts per channel into 4 Ohms, all channels driven, with a rated THD+N of < 0.02% and an A-weighted signal-to-noise ratio of 112 dB. It features a robust linear power supply with an oversized toroidal transformer, a refined Class A/B output stage, transparent fault protection, and both 12V trigger input and output for system integration.

New for the A7+ are balanced XLR inputs on every channel, in addition to standard unbalanced RCA inputs—offering improved noise rejection and wider compatibility with processors and receivers that support preamp outputs. High-quality five-way speaker terminals accept banana plugs, spade lugs, or bare wire, making it easy to connect to your preferred speaker setup.

The A7+ is designed to provide clean, reliable power in a wide range of systems. Use it to power a full 7.1 surround sound setup, an immersive Atmos or DTS:X configuration, or upgrade an AVR with preamp outputs for dramatically improved dynamics and headroom. With stable operation into both 8 and 4 Ohm speaker loads, it’s a versatile amplifier that adapts to your needs.

This combination of real-world flexibility, solid engineering, and high-end performance at an accessible price point makes the BasX A7+ a powerful addition to any serious home theater system.

Circuit Topology

The BasX
A7+ is a seven channel power amplifier that 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 affordable price.

Audio Specifications

• Power Output (ALL channels driven):

90 watts RMS per channel; 20 Hz – 20 kHz; THD < 0.02%; into 8 Ohms.

125 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.

• Gain: 29 dB.

• Power
Bandwidth (at rated power; 4 Ohm - 8 Ohm load): 

20 Hz to 20 kHz (+ / – 0.07 dB).

• Broad Band Frequency Response:

5 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).

> 95 dB; ref 1 watt; (A-weighted.

• Minimum Recommended Load Impedance (per
channel): 

4 Ohms (equals one 4 Ohm speaker or two paralleled 8 Ohm speakers).

• Damping Factor: 

(8 Ohm load): > 500.

• 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

Environmental

Dimensions: 

17” wide x 4-1/4” high x 15-1/2” deep (unboxed; including feet).

Weight: 

28 pounds (unboxed).

User Manual

User Manual