The Audiophonics HPA-S500ET power amplifier unveils a Class D architecture based on a pair of Purifi 1ET7040SA modules and a custom-designed power supply to enable the amplifier to deliver its full potential. Like all Audiophonics Workshop products, the HPA-S500ET is meticulously designed and assembled by hand in our workshop in France.

With this model, you get a powerful, high-performance amplification solution, capable of powering demanding audio systems while delivering incredibly fine, linear sound reproduction. There's no compromise between power and sonic precision. Purifi modules feature a particularly rigorous design for exceptional measured performance.

All components are housed in a sturdy, solid aluminum enclosure, with openings and heat sinks for efficient heat dissipation. Its design also limits the impact of interference on the signal.

Audiophonics interface card

The two modules are controlled in phase opposition, to cancel the "Power Supply Pumping" effect. This makes for greater power supply stability, distributing current draw alternately on each rail, thus increasing its capacity. We opted for two-level voltage regulation, to optimize the power supply to the AOPs and the auxiliary voltage supplied to the modules. One Audiophonics OPA1656 is used per channel. These are very low-distortion PDUs, offering maximum transparency with very low THD. They are mounted on a socket so they can be replaced if necessary. To suit all applications, we've opted for three gain settings, switchable via jumper on the underside of the unit.

Balanced & Single-ended connectors

Designed for easy integration, the HPA-S500ET features both balanced XLR and single-ended RCA stereo inputs. Bipolar selectors make it easy to change input sources, and even allow independent control of channels. On the output side, insulated Audiophonics terminal blocks (developed in partnership with AEC Connectors) with 24k gold-plated contacts ensure an excellent connection between amplifier and loudspeaker. A dual 5-12V trigger module lets you integrate the amplifier into an automatic on/off chain for your entire audio system.

1	ON/OFF button
2	Power input
3	Trigger
4	Right channel speaker output
5	Left channel speaker output
6	Right channel XLR input
7	Right channel input selector
8	Right channel RCA input
9	Left channel XLR input
10	Left channel input selector
11	Left channel RCA input