Axiom Home Page Forums General Discussion Technical Questions Can Low Crossover Damage QS8s?

Set the cross over point in accordance to your mains (as they can go lower than any other speakers you have) I have my cross over set at 60Hz, and all speakers set to small.

You don't need to, nor would you want to set it based on the highest frequency rated speaker (the surround), as you'll be robbing your mains of their duties in those ranges.

Nearly everybody sets their crossover between 60-80Hz. There is a reason for this. 1) At that range you get into the non-directional bass frequencies, so letting your sub handle those areas won't draw attention to itself. and 2) above that number is the upper-bass range, which is both directional, and usually better reproduced by your other speakers. (remember, subwoofers serve a very specific purpose, LFE!)

Don't over think it. Slap some QS8's up on the walls, and play around with the crossover settings. I'd try 40, 60 and 80 and stick with the one you like the sound of best. No harm will come to your speakers, regardless of what you choose.

AB,regardless of the crossover flexibility that a particular receiver may offer, there may be little reason to set a crossover lower than 80Hz on any speaker. THX and others found that to be a good compromise, being low enough so that the sub generally can't be easily localized and being high enough to take a significant part of the lowest bass burden off the mains(and the amps driving them)and putting it onto the sub, where it belongs.

Be that as it may, you really don't have to make the choice that you discuss; the Onkyo 703 has individual crossover settings for the different groups of speakers, similar to the provision in the HK models.

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the Onkyo 703 has individual crossover settings for the different groups of speakers, similar to the provision in the HK models.

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I can confirm that as well, for I almost purchased an Onkyo before deciding on my Pioneer Elite.


Sutter

Can I just get a stamp that says "What JohnK said"?

Bren R.

Bren!! Holy Crap man, where have you been?!? prison?!? welcome back brother. i was just listening to your cd the other day and thinking that we hadn't seen you in a while.

<<Brett McLaughlin writes in ecoustics.com :

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A final thing to note is you have to be wary of processors that allow you to set different crossover points for different speakers. With the exception of some very high-end processors, you should not use this feature. The vast majority of processors with this "feature" high-pass each speaker's signal at the frequency you specify, and send it to the speaker. This is good. However, to feed the sub, the processor will sum the full-range signals from all the full-range channels and the LFE channel, and then low-pass this signal at the lowest crossover point you set. So, if you have your surround crossover set to 100 Hz and your main crossover set to 40 Hz, there will be a 60-Hz hole in your surround channels' responses. This is not good. THX chose 80 Hz as its bass management crossover point for a reason; trust their research and experimentation.
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I picked this up on the Outlaw forum. Is this correct?

I don't think so, but I'm not certain. My H/K lets you set the sub crossover separately from the others, so as long as that's set high enough (I think) it takes care of the rest. Could be wrong; but there's no way to turn off the feature other than setting everything the same.

>>I picked this up on the Outlaw forum. Is this correct?

I sure hope not, and I really hope it's not true for HK receivers

Maybe we can contact the author for clarification ?

Link to ecoustics article

Sorry I didn't get this earlier.

For Outlaw's 990 Pre/pre:

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The Model 990 does not take the lowest crossover point and apply it to the summed sub signal as suggested of lower end products in this article. The information is summed and sent in its entirety to the LFE channel.

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Maybe it works this way for H/K as well.