Axiom Home Page Forums General Discussion Advice from Axiom Owners Back surrounds, static sound/distortion

Hi rage,

Along with the other advice given, check your "Small/Large" speaker settings to make certain the back surrounds are set to "Small", no matter which processing mode you're using.

If the back surrounds were inadvertently set to "Large" in the THX mode, deep bass might overload the drivers at very loud playback levels or drive the Onkyo's surround-channel amps into distortion.

Regards,
Alan

Yeah. Before swapping speakers and such it could be something as little as having the QS8's set to "large" in the thx mode. The QS8's are not full range speakers and should be set to small with a crossover of 80hz or 90hz. Double check "large" or "small" and the crossover settings when the thx mode is activated on the receiver.

Interesting on how something so simple sometimes slipes our minds.

I tested out the speakers and thank god they are fine(not blown). I also set my back surrounds to 90hz, I tried to find the speaker size but all I can find is normal/ Bi-amp and a set 6 or 8 ohm setting no large or small speakers on my Onkyo 806

It seems to be working as of now but I will be keeping a eye on it. I talked to my brother in law who said it could have been a drain on the CPU which in turn could mess up the sound/codec, I us a HTPC for everything. Guess this will be a way to convince the wife to get a new CPU and more hard drive space.

If you set the crossover to 90hz, it means "small". Small/large are terms used by receivers with a fixed crossover.

I find it hard to believe the Onkyo does not have small/large speaker settings in the setup section. It is possible that by setting the crossover to 90hz, tells the receiver the speakers is "small", just have never seen that...

If you set the back surrounds to 90hz, what was it at before you changed it? Also, all your speakers should be set to small, or 80hz for starters, depending on their specs.

ah now I understand thanks I thought spesker size (large, small)where different then hz.

Had the backs set to 80hz (all speakers/sub also set to THX 80hz)now put the back surrounds to 90hz, they seem not as loud anymore but backs are not meant to stand out like the fronts do, not that they where that before, there just not as noticeable now.

I would recheck the SPL out from those speakers, you should still have a similar noticeably loud sound to them, with less bass coming out of them they could very well be a few db lower.

I have my center at 0.0 Db the left/right front are -5 Db and the back surrounds are set to -1.0 to -1.5 Db, depending on the movie. oh and before I forget the sub is set also at 0.0 Db, I read that you should also set you receiver to 0.0Db and do all your adjustments to the controls on the back of the sub, to much or to little power could damage the sub.

I like to have the center stand out more, better for dialogue in T.V/movies.

You're right about the sub. It's best to try to get your receiver close to 0. Too little, and the sub, when set to auto-sense, may not turn on. Too high, and the output of the receiver may clip during heavy bass events when the volume control is also turned up.

The other channels should be set so each speaker reproduces pink noise at equal levels. That is, you use the test tones to select each channel in turn while adjusting the trim up or down to get them all to play at 75 dB.