Distortion after playing music at loud volumes for a while - AVS Forum
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Old 04-06-2013, 06:08 PM - Thread Starter
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I have the Polk RTI12s and Onkyo NR609 and I hear distortion after playing music at loud volumes for a while. It has been like this since I bought them. After resting them for 5-10 minutes they start to sound normal again. What could be causing that?
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Old 04-06-2013, 06:21 PM
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Are you sure it's not your ears?

Check to see if your AVR is getting very hot when you start to hear this.

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Old 04-06-2013, 08:15 PM
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Originally Posted by brutal0101 View Post

What could be causing that?
Thermal power compression, which occurs when voice coils get hot. It's a sure sign that your speakers aren't up to what you're trying to get out of them. I suspect it's mainly the tweeters, which probably struggle to keep up with the rest of the drivers.

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Old 04-06-2013, 10:29 PM - Thread Starter
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Originally Posted by ousooner2 View Post

Are you sure it's not your ears?

Check to see if your AVR is getting very hot when you start to hear this.

I am 100% sure it's not my ears. AVR does get hot but all AVRs do get hot after a while I believe.
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Old 04-06-2013, 10:32 PM - Thread Starter
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Quote:
Originally Posted by Bill Fitzmaurice View Post

Thermal power compression, which occurs when voice coils get hot. It's a sure sign that your speakers aren't up to what you're trying to get out of them. I suspect it's mainly the tweeters, which probably struggle to keep up with the rest of the drivers.

What do you mean by what I am trying to get out of them? I never play them at 80 plus and I only have them biamped to my AVR so no extra power. I thought the RTI12s are top of the line so why are they having this issue?
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Old 04-06-2013, 10:43 PM
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Originally Posted by brutal0101 View Post

What do you mean by what I am trying to get out of them? I never play them at 80 plus and I only have them biamped to my AVR so no extra power. I thought the RTI12s are top of the line so why are they having this issue?

Could be because you are running the Onkyo nears its limits, causing it to clip, which puts a lot of stress on the tweeters.

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Old 04-07-2013, 06:54 AM
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Originally Posted by brutal0101 View Post

I thought the RTI12s are top of the line so why are they having this issue?
You can only get so much out of a single tweeter, and you can only get so much out of a 100w/ch amp. Whatever the reason distortion means you're playing the system louder than it's capable of. Turn it down, because that distortion is a warning that you're exceeding system capabilities. Ignore it and you run the risk of damaging your speakers.

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Old 04-07-2013, 09:43 AM
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Try not bi-amping them and see if something changes.

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Old 04-07-2013, 10:00 AM
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Here is an outstanding short thread that discusses various compression aspects, focusing a lot on peak compression. You're experiencing normal compression, long term compression from encountering the thermal limits. They just can't dissipate the heat you're giving them.

Like Bill said, you're just trying to get more out of your speakers than they can take.

A by product of the current flow in the voice coil is heat. Thermally, your drivers (and crossover network) can only handle so much before the speaker's parameters change. The crossover points can change, etc. When one component in say a three way, enters compression first, then spectrally the output changes.

Simplified, compression is when a driver's output level ceases being proportional to it's input level. This causes audible changes. The prudent enthusiast, upon first hearing such changes, stops increasing drive level, and backs off 'til the output is clean.

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Old 04-07-2013, 03:00 PM
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Originally Posted by ousooner2 View Post

Try not bi-amping them and see if something changes.
Nothing will unless he goes to the trouble of removing the internal passive crossover and installing an active crossover in his AVR, because if you don't do that it's not bi-amping, irrespective of what some marketeer labels it in their sales literature.

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Old 04-07-2013, 04:04 PM - Thread Starter
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Originally Posted by Bill Fitzmaurice View Post

You can only get so much out of a single tweeter, and you can only get so much out of a 100w/ch amp. Whatever the reason distortion means you're playing the system louder than it's capable of. Turn it down, because that distortion is a warning that you're exceeding system capabilities. Ignore it and you run the risk of damaging your speakers.

But it's barely loud enough even at THX Ref 82 volume to me. What would be a simple solution to this issue? Will changing the AVR help? Or will adding an external amp help? The speaker specs say upto 500W but you guys wrote I am already over driving them.
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Old 04-07-2013, 04:05 PM
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That was a horrible attempt at sarcasm lol....I guess it didn't come off that way. smile.gif

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Old 04-08-2013, 06:28 PM - Thread Starter
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Anyone with any suggestions please??
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Old 04-08-2013, 06:51 PM
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Quote:
Originally Posted by brutal0101 View Post

But it's barely loud enough even at THX Ref 82 volume to me. What would be a simple solution to this issue? Will changing the AVR help? Or will adding an external amp help? The speaker specs say upto 500W but you guys wrote I am already over driving them.

If you are clipping the amp, then based on what Bill's told me before (and my explanation is not nearly as good), that can cause way more power to be sent to the tweeters than normal. Even though your speakers are rated up to 500 watts, the tweeters can't handle anywhere near that.

So external amp might help. How about this one: http://shop.emotiva.com/collections/amplifiers/products/xpa2

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Old 04-08-2013, 09:16 PM
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What other equipment is in the chain? How are you playing music, what format, etc?

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Old 04-08-2013, 09:59 PM - Thread Starter
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Originally Posted by ousooner2 View Post

What other equipment is in the chain? How are you playing music, what format, etc?

Through my PC HDMI connection and sometimes directly through the Onkyo App from my phone. When I have the music optimizer it starts distorting even sooner may be because of the extra bass. I think I hear more distortion from the Mids than the tweeters. I normally play in stereo mode.
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Old 04-08-2013, 10:00 PM - Thread Starter
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Originally Posted by cel4145 View Post

If you are clipping the amp, then based on what Bill's told me before (and my explanation is not nearly as good), that can cause way more power to be sent to the tweeters than normal. Even though your speakers are rated up to 500 watts, the tweeters can't handle anywhere near that.

So external amp might help. How about this one: http://shop.emotiva.com/collections/amplifiers/products/xpa2

Just wondering how would adding an external amp limit the extra power sent to the tweeters, wouldn't it increase it?
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Old 04-08-2013, 10:05 PM
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Originally Posted by brutal0101 View Post

Just wondering how would adding an external amp limit the extra power sent to the tweeters, wouldn't it increase it?

You missed the point. When an amp clips, an excessive amount of power can be sent to the tweeters. I'm not the one to explain it to you beyond that (lol). Need one of the audio tech gurus here for that.

So if the amps not clipping, the tweeters should be getting the right amount of power that they can handle.

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Old 04-08-2013, 10:27 PM
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But it's barely loud enough even at THX Ref 82 volume to me. What would be a simple solution to this issue? Will changing the AVR help? Or will adding an external amp help? The speaker specs say upto 500W but you guys wrote I am already over driving them.

You cannot connect an external amp to the Onkyo NR609. so that point is moot. you're gonna need a different receiver if you plan to add an external amp.

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Old 04-09-2013, 01:00 AM - Thread Starter
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How to make sure my NR609 Amp doesn't clip?
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Old 04-09-2013, 08:34 AM
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Originally Posted by brutal0101 View Post

How to make sure my NR609 Amp doesn't clip?

Don't play it as loud. That might sound facetious, but sorry. It's the truth.

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Old 04-11-2013, 11:33 AM - Thread Starter
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I think my sound quality has deteriorated now, speakers don't sound as good as they used to.
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