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Class D Switching Power Amplifiers and Power D/A conversion

The New Hypex Fusion Plate amps
The New Hypex Fusion Plate amps
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Old 19th October 2018, 04:13 PM   #1051
triode_al is offline triode_al  Netherlands
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Join Date: May 2004
Location: Westland
Originally Posted by jarkaa View Post
Just received a pair of FA122 amps.

On both modules automatic start with signal detection does not work.

When modules are switched off from the mains the presets disappear.

I have been waiting for response from hypex for a week now.

Other fusionamps are exhibiting also various other problems. Company has released products without proper testing and a lot of quality problems.
I had this too, intermittent start-up timing.
I then figured out it has to do with the fact I have a 1x buffer after the volume. The whole gain architecture has to be taken into account. My main speaker is 97 dB.
  • For the coupling to the Hypex I made a special 20 dB line out amplifier, and now the units starts up perfectly. Yes, I see it clips when loud but I never go that loud.
  • . . and now it starts perfectly, no problem.
SPU --> tube MC/RIAA;
Pass buffer -->300B SE + DN2540 CCS/Buffer; --> 165GMF in TQWT; working on a HYPEXed sub.
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