Is Your System's Noise Floor Low Enough? - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 60 Old 12-13-15, 12:53 PM
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Re: Is Your System's Noise Floor Low Enough?

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That was a lot of work. We will be very interested in hearing what you discover in your listening tests. Good diagnostic work by the way. Those things are not always easy to find.
3hrs total w/ troubleshooting. Thanks it was.

I basically can say that my system is silent... but man you really gotta stick your ear right next to the tweeter and barely hear a hiss... at first I couldn't hear it but the kids where laughing/playing in the adjacent room... when the house was quiet for a brief rare moment I checked again and its very faint.

at this point I'm not sure what to do to 100% eliminate it but it's not like I run the system at max volume with nothing playing and have my ear less than 1" away from the tweeter anyway.

...it felt like playing russian roulette doing this too lol...

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post #12 of 60 Old 12-13-15, 01:13 PM Thread Starter
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I know what you mean.

While I was taking measurements with my mic input connected to my speaker output, I felt exactly the same way.

If you can barely hear his with your ear next to the tweeter and the volume all the way up, you are way into the safe zone and can probably get it no better no matter what you do. That is about where my system is over the optical input, and that is as good as it seems to need to be for ultimate sonic performance.

From what I can tell with my system, if you can hear it at the LP with the volume all the way up, or if you can hear it at the speaker with volume at normal level, you need to do some work. In your case, you are way beyond that. It sounds like you started out being able to hear stuff at the LP at normal volume, which means serious problem.
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post #13 of 60 Old 12-13-15, 01:31 PM
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Re: Is Your System's Noise Floor Low Enough?

I did have a problem... I could hear it at normal listening levels at the LP. THD was sitting around 1-2% all the way throughout the audible range. It wasn't that bad w/ the Denon but since the XMC it was there but again laziness is my weakness. I'll be sure to retest this and see if I can capture the difference on the REW chart.

This thread motivated me to get off my butt and fix it. Thanks!
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post #14 of 60 Old 12-13-15, 09:50 PM
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Re: Is Your System's Noise Floor Low Enough?

Wow... I've only listened to a few tracks but like you said the clarity but more so the openness has really improved dramatically. The soundstage "space" has opened up like my walls and ceiling are 30 feet away. The sound seems to have grown around the sides of the wall but the sound is more centered. It's a very weird change. The instruments show more pinpoint location and have appeared to of moved in slightly but the space or the sound of the room they recorded in has really opened up and grew around my room.

It's definately a change for the plus but wow... I can't wait to burn in some more time this week. This was running DIRECT mode because I still need to re-run Dirac.

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post #15 of 60 Old 12-13-15, 11:37 PM Thread Starter
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Excellent. Thank you for letting us know your results. It makes you wonder how systems there are out there that could sound a whole lot better with just a little diagnostic work and a few minor changes.

It is a weird change. Kind of hard to describe the difference until you have heard it. Openness, depth of the darkness between sound images, contrast, the sound that is there seems to stand out more ..
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post #16 of 60 Old 12-14-15, 07:32 AM
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Re: Is Your System's Noise Floor Low Enough?

My system seems to hiss all the time! But wait!! That might just be my tinnitis I'm hearing!
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post #17 of 60 Old 12-15-15, 11:53 PM
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Is Your System's Noise Floor Low Enough?

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Excellent. Thank you for letting us know your results. It makes you wonder how systems there are out there that could sound a whole lot better with just a little diagnostic work and a few minor changes.
.
since you started this thread, I've become certain that my system is one that could benefit. Especially since I've added the Yamaha amp. Somewhere since then, I've picked up a hiss. I can't hear it past about a foot, and the only thing I can think to do is drop the gain on the amp and raise the trim in the avr to compensate. I'll check tomorrow to see what happens without a signal with the volume up. The Yamaha has added a lot(of little qualities) and I'd like to wring it out the rest of the way. I appreciate your cramazing(yep, crazy/amazing) dedication. I can't help but think of Tom Noussaine.





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post #18 of 60 Old 12-16-15, 08:03 AM Thread Starter
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willis7469: if you can hear the hiss at one foot with the volume at a normal listening well, then you have a problem. If you can hear the hiss only with the volume turned all the way to max, then you might be OK.
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post #19 of 60 Old 12-16-15, 12:37 PM
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Re: Is Your System's Noise Floor Low Enough?

Thanks Wayne. I figured you would say that! I just did a little impromptu check at lunch. The distance is more like 6 inches. The sound is a mix of hiss/hum. The sound doesn't change output no matter how loud or soft the volume. That makes me think 60hz hum. I have 4 dedicated 20a circuits to the wall for the purpose of powering my gear, but everything is plugged into an APC h10. Any ideas? So far, I'm loving this amp.


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post #20 of 60 Old 12-16-15, 01:15 PM
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Re: Is Your System's Noise Floor Low Enough?

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Thanks Wayne. I figured you would say that! I just did a little impromptu check at lunch. The distance is more like 6 inches. The sound is a mix of hiss/hum. The sound doesn't change output no matter how loud or soft the volume. That makes me think 60hz hum. I have 4 dedicated 20a circuits to the wall for the purpose of powering my gear, but everything is plugged into an APC h10. Any ideas? So far, I'm loving this amp.


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ground loops will sound like this:

Handling those issues should be done like this:

Hiss comes from other sources... high frequency noise introduced on the line by a number of any unknown sources. Truth be told... try it without the UPS. I've read that UPS equipment throws alot of high frequency noise onto the a/c lines. might want to take that out and retry... report your findings back to us.

moving to balanced xlr connections and using balanced isolation transformers are ways to further eliminating the noise.

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