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Speaker hiss that increases as volume increases.

post #1 of 5
Thread Starter 
I have a Sony STR DG 2100, Kef 2005.2 speakers, PS3, APC C5 power filter all connected together via generic hdmi to a Samsung LN46A650 and with quality monster speaker wires. I watch Blu ray movies all the time and there is one thing that keeps it from (relative) perfection: When I increase the volume beyond -15 or so I hear a significant hiss that fades in and increases progressively with the volume. I added a power filter and although it had some good effects it didn't do anything to the hiss. Next I cranked up the volume to where I could clearly hear the hiss and and individually disconnected and unplugged each component and speaker from the system to see if I could isolate it, but found nothing. Next I rechecked the electrical to make sure the sockets are grounded properly and they were. I next plan to run a cable from the grounding rod buried outside my HT room to the receiver. Any ideas on what could be causing this? I hate watching movies quieter than I would like to just to avoid a hiss, especially with those TrueHD movies recorded quietly.
post #2 of 5
Hiss is likely not from improper grounding.

Hiss is present on all audio gear. Back in the analog days, it was common to hear hiss on a totally disconnected input when the volume got loud enough.

Hiss will increase with volume.

I would say they have reduced that a lot in newer receivers I have owned. The signal to noise ratio is impressive on my receivers. I have to raise the volume to almost max to hear it.

If you can hear hiss in movies, it's too loud. I suspect an internal receiver problem.
post #3 of 5
What are the tone controls on your receiver set at? Is the treble boosted in any way? It could be as simple as adjusting your equalization.
post #4 of 5
are you power cables ran parrelell to your speaker wires? this can sometime give a hum or a hiss to speakers.
post #5 of 5
Thread Starter 
Quote:
Originally Posted by cozmo1976 View Post

What are the tone controls on your receiver set at? Is the treble boosted in any way? It could be as simple as adjusting your equalization.

I adjusted the equalization and that helped quite a bit but it also lowered the overall volume and I think effected the sound. It's better than the hiss but it seems like should be able to have the equalizer above flat and remove the hiss, it's so annoying in I Am Legend in the quiet scenes and then it gets loud and it's not loud enough. Any other ideas? I'm hoping MichaelJHuman isn't right because that means a new receiver and I'm not looking for that yet although those new Denons sound so nice.....
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