AUDIOPHONICS HPA-Q400ET 4-Channel Class D Amplifier Purifi

We're proud to present the Audiophonics HPA-Q400ET, a 4-channel Class D power amplifier based on four Purifi 1ET400A modules. This ready-to-install, ready-to-use version is aimed at audiophiles and home theater perfectionists looking for a foolproof amplification solution, with considerable power reserves and impeccable linearity. Purifi modules are among the most rigorous Class D amplification solutions on the market, with measured performance that is nothing short of exceptional.

The result is a high level of sound reproduction, suitable for use with demanding loudspeakers for both Hi-Fi and home cinema applications, for large listening rooms or for studio applications requiring considerable headroom without compromising on the precision and richness of the audio message.

All components are housed in a sober, robust 100% aluminum case with openings and heat sinks to promote heat dissipation. Its design also limits the impact of interference on the signal.

Audiophonics interface card

Purifi amplifier modules are grouped in pairs and driven in phase opposition, to cancel the "power-supply pumping" effect. This makes for greater power supply stability, distributing current calls alternately on each rail, thus increasing its capacity.

We've opted for 2-level voltage regulation, to optimize the power supply to the OPAs and the auxiliary voltage supplied to the modules. This allows the OPAs to be supplied with a high voltage (18V) for better overall performance, and enables them to supply the voltage required to reach the amplifier's maximum output level. While maintaining the auxiliary voltage required by the modules.

One Texas Instruments LM4562 OPA per channel is used, providing precision and musicality. They are socket-mounted, allowing replacement if necessary.

To suit all uses, we've opted for 4 gain settings, adjustable by jumper on the interface board.

Connections

High-performance and versatile, the HPA-Q400ET Purifi amplifier features four inputs on XLR connectors, with four pairs of speaker terminals at the outputs. This means it can be used for everything from high-fidelity listening to bi-amplification and multi-channel home-cinema applications.

1	ON/OFF switch
2	Speaker output
3	Speaker output
4	Power input
5	Trigger input
6	Speaker output
7	Speaker output
8	XLR input
9	XLR input
10	Fuse
11	Trigger output
12	XLR input
13	XLR input