2. amps-preamps
  3. 1375199393

Preamp Noise with High-Efficiency Speakers

I have Avantgarde Duo Classic Speakers, I hear a very audible buzzing noise whenever I insert an analog preamp. If I run my DAC (AMR DP-777) directly into power amp, the noise disappears. I have tried 4 different preamps (tube and SS), 3 different amps, a bunch of RCA and XLR interconnects, the problem persists. I have tried dedicated power line and two power conditioners (with Multi-wave options) and various high-quality power cords, so far nothing works, and I am forced to run DAC-direct into power amp. The buzz is not very loud but certainly audible enough to be annoying. There's no noise running the same equipment and power source into regular speakers, I am pretty sure it's just the Avantgarde (104dB sensitivity). Please share your solution if you have had similar situations. Thanks!
yingtonggao

Showing 2 responses by dentdog

dentdog's avatar
dentdog
506 posts
 
This thread has been quiet for some time but has yielded some well sorted out theories.
I stumbled on it with hopes of finding a solution to a hum problem that seems to center around a phono preamp and like others on here, brought to light by some high efficiency speakers.
I've tried a star grounding system, moving power/ICs, etc.
Have dedicated lines and sub panel, a Balanced Power Technologies 3.5 Sig Plus. After I installed the BPT, the edge I was hearing in the presentation took a step back, and yes, the presentation became more natural.
Along with it came the hum, which was previously more subdued.
I will spend some time this weekend chasing down possible sources, not looking forward to this.
Question is: could the Power conditioner's large transformer be reaching 3 feet or so to the phono pre?
dentdog's avatar
dentdog
506 posts
 
Hi Charles1,
As with most things audio the devil is in the details. The BPT certainly does a lot of things favorably, a sense of ease permeates the music now and is very pleasing. Will have to don my Sherlock hat although Inspector Gadget is a more appropriate. I'll get it, and along with the solution a bit of education.
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