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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
charles1dad's avatar
charles1dad
10,250 posts
 
Atmasphere wrote,"I am of the opinion though that passives loose detail and not that actives add it".Right! I`ve believe this for a long time. That`s why the common complaint concerning passive/direct connection is less,tonal body,weight,timbre and dynamic presence-drive.These are real musical attributes not colorations.
yingtonggao OP
71 posts
 
Well, guys, this thread just gained another dimension.

I am a firm believer of well-designed active preamps after trying a few passive ones. I do not exclude the possibility of passives work better in other systems, and in return I hope the supporters of passives don't decribe all active preamps as "colored".

The noise I suffered may be related to too much gain, but I've heard systems with more active gain and with the volume pot(s) at maximum, when there's no music playing, the system is totally silent. Modern components easily achieve 100+ dB S/N ratio, two or three of them hooked up in serial should not generate such an audible noise.

Anyway, you guys reply faster than I could try different options. But this thread is very insightful.
atmasphere's avatar
atmasphere
11,817 posts
 
Yingtonggao, what you report is a buzz. But you did not report hiss, which says to me that the gain is not the culprit. There is some hookup (like a ground loop of a poorly shielded cable) which is allowing the buzz to manifest.
yingtonggao OP
71 posts
 
Atmasphere, you are right, I'd call it a buzz, not hiss.
atmasphere's avatar
atmasphere
11,817 posts
 
Yingtonggao, what this suggests to me is what I mentioned in my first post on this thread. It may be that the preamps you have tried so far have troubles with ground loops, but it could also be a problem in the amplifiers. Have you tried any of the suggestions I offered?
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