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Quiet Stereo Amp Suggestions
PhantmShado
post Apr 12 2012, 08:40
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My HK 3490 I use on my desk with bookshelves about 2 feet away from me always seems to have a low hiss noise (slightly louder on right channel then on left) that is always present at some volume regardless of chosen input. The noise at times bothers me more than other times just listening to the speakers, but if I plug in audio technica headphones (which I've found to be easy to drive) the hiss becomes unbearable.

To this end I was wondering if there are any stereo amps I might look at that eliminate this hiss? I currently use the optical in and so would like a replacement that also has that. The speakers are Linn Majik 109s and they are pointed in at me each at about 2 feet from my ear.

Thanks.
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PhantmShado
post Apr 13 2012, 03:01
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Ok, I pulled the jumpers connecting preamp and amp and on both my living room and desk unit as I was curious. The hiss situation remained unchanged on the living room amp. However, listening to the desk speakers, the hiss rose to a regular music volume on removal of the jumpers. It was also still just the right channel though while the left remained very quiet.

Any other ideas besides just getting a new amp? As it's predominantly on one channel for each of the amps, I assume it doesn't relate to the speaker load as both left and right should be the same.
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Arnold B. Kruege...
post Apr 13 2012, 13:22
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QUOTE (PhantmShado @ Apr 12 2012, 22:01) *
Ok, I pulled the jumpers connecting preamp and amp and on both my living room and desk unit as I was curious. The hiss situation remained unchanged on the living room amp. However, listening to the desk speakers, the hiss rose to a regular music volume on removal of the jumpers. It was also still just the right channel though while the left remained very quiet.


If I get this right, your receiver's background noise was unchanged but still objectionable after you pulled the input to its power amp, but the noise was only objectionable in the right channel?

It's axiomatic that the channels of a stereo power amp should be audibly identical.

What happens if you switch the channels in the speaker wiring?

It is possible that the difference you hear is either due to the speaker or its acoustical environment.

If I am understanding what you wrote, when you pulled the inputs to your desk speakers, their noise level increased greatly, but again the channels were different, and again only the right channel was objectionable or was most objectionable.

What happens if you swap the locations of the speakers, L & R?

Is there a possibiliity that the high frequency response of your L & R ears varies?

This post has been edited by Arnold B. Krueger: Apr 13 2012, 13:22
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