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
It seems some prefer a more realistic sound thus the preference for high quality actives.Everything sounds different(not just actives) including passive devices(they have their signatures also) and even going direct the sound varies. Anything inserted into an audio system signal path will make its presence known.So you might as well go with what sounds most real and enjoyable to the individual listener.
Charles1dad Quote:"Anything inserted into an audio system signal path will make its presence known."

That's right, one of the best open/transparent sounds lately I have heard was from a old Musical Fidelity A3/24 dac that has such a beefy output stage (standard) that can give 6watts!!!, (modified output resistor from 47ohm to 1ohm)
This dac was directly attached to a pair of highend 108db horns from Italy (no power amps, no preamps), directly from the dacs output rca's to the speaker terminals.
The more active junk in the signal path the worse/electronic the sound becomes.

Cheers George
George it`s interesting how you dismiss the results of others who don`t agree with you. Grannyring and others on this site have put their money where their mouth is and actually purchased your component.Most of them thought highly of it but ultimately found short comings when directly compared to an active linestage in their systems.

Rather than graciously acknowledge their honest opinions, you claim they just prefer the added colorations they hear.A bit defensive and disingenuous don`t you think? Why can`t you admit they have discovered a few sonic flaws with your component when it was out performed by another component? there`s no shame in that, nothing is perfect,and some will prefer your device(it goes both ways,subjectivity).Do you believe you have superior hearing or that the others don`t know what live performing musicians truly sound like? Are they all wrong and you`re right? true to the source(as you claim) is a pale alternative to those components that reach deeper and further and provide the closer to real live music criteria/sound.Why would someone settle for less,tone,body,dynamics and vibrant timbre/harmonics(what Grannyring and others found lacking with the Lightspeed) in the name of "true to the source" which is less convincing in direct comparisions.Humility is a virtue.
Charles & George- Rather than argue about this, one could very easily conclude (and I think Grannyring and others, including myself who have compared the Lightspeed to active linestages have concluded) that the Lightspeed is one of, if not THE best values in high end audio. It's virutes are transparency and lack of coloration. It's shortcomings are timbre and dynamics but you have to spend perhaps 10X or more $ to substantially improve on the LSA. And George, you should be very proud of that!
Swampwalker,
There`s no arguement,and I`ve said his component has gotten much praise and compliments(Grannyring for example). My point is don`t be condescending and dismissive to those listeners who chose an active component rather than his.All components have their sonic compromises(to some degree) including his Lightspeed.