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How does one find out ones reciever crossover? (1 Viewer)

BrettisMckinney

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Aug 25, 2002
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I have a Yammy rx-496 and i have no settings for the crossover. I have all speakers set to small and lfe to sub. I checked the manual and didnt say. Just says when describing LFE..this channel is for 20-120hz. THinking it could be 120? Dont know. I've set my sony sawm40 to around 80..if i go up i notice it getting boomy and starting to take over the mains too much. ANy suggestions?
 

Brett DiMichele

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Brett
The THX Standard is 80Hz and many Recievers even NON THX use
that 80Hz XO. But if the Manual says 20-120 I would be
inclined to believe it's 120.. Have you checked Yamaha's
web site?
 

BrettisMckinney

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Aug 25, 2002
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Not recently but i checked a little while back and the model isnt listed now as its a good 4 years old now. WOuld you think 120 is a bit high?
 

Lewis Besze

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Yamaha use the odd 90hz for both Lp and HP.
S&V do test and post those figures on their reviews.
I never seen a Yamaha with other figiures then 90hz,that includes their current flagship.
 

DanielSmi

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Mar 20, 2002
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Brettis, it's not a good idea to use the crossover in your receiver and the crossover in your sub at the same time. You will lose a lot of bass that way. If you can turn off the crossover in your sub it may have a switch in the back to bypass the XO if you can't do then turn the XO knob up to the highest frewquency like 150Hz or however high it can go. When you go through two XO the first XO in your receiver will send everything below 90Hz to your sub and then everything above 90Hz to your speakers then the XO in your sub will cut everything from 80Hz and above out of your sub. So you end up losing around 10Hz in bass from around 80Hz to 90Hz will not be there. By turning your XO knob to it's highest position it reduces or eliminates this problem.

Daniel Smith
 

Lewis Besze

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90Hz to your sub and then everything above 90Hz to your speakers then the XO in your sub will cut everything from 80Hz and above out of your sub. So you end up losing around 10Hz in bass from around 80Hz to 90Hz will not be there. By turning your XO knob to it's highest position it reduces or eliminates this problem.
yes I agree,also keep that on mind, that most sub's crossover markings are incorrect meaning when ir shows say 80hz on the dial it could be anywhere from 40-100hz,so not very precise.Also cascading crossovers[like in your case]could cuase phase shift problems which can be very audiable, in severe cases.
Yes, either turn off the sub's crossover or turn it up to it's highest.
 

BrettisMckinney

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Aug 25, 2002
Messages
281
Ok thanks guys. I'll see how it goes. From memory when i turn it way up it seems too boomy..especially on music. Your right about the dial accuracy..i'm guessing its around 80hz. I didnt realize that my amp would have a set xo as it wasnt in the menu..as i know some can set what it is. So thats why i did it on the sub.
 

Lewis Besze

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You mean you can't choose on speaker size?
If you can,then when you set the main 5 speakers to small, it will automatically engage the lowpass and highpass filters at 90hz.[bm]
 

StephenL

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Nov 21, 2000
Messages
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From memory when i turn it way up it seems too boomy..especially on music.
I had the same problem with my Yamaha. Their low-to-mid priced models use 18 dB/octave 90 Hz low-pass filters. I used a Behringer Feedback Destroyer to equalize the subwoofer.
 

BrettisMckinney

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Aug 25, 2002
Messages
281
Yeah i have set all the speakers to small. Turned the subs xo over 170hz but havnt been able to do much testing yet.
Hey Stephen, what is the feedback destroyer?..what does it do?
 

Jonathan M

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Jul 23, 2002
Messages
267
I have a way to verify the low pass and high pass filters of a receiver, including the F3's, slope, alignment etc. as well as seeing what's happening to the LFE channel (10dB boost as it's supposed to), whether the LFE channel is being filtered by the Low pass filter, whether it's being thrown away in downmix mode or if the sub is off etc. etc.

It involves playing a special CD of test tones (MLS signals) which are encoded in PCM, DD and DTS, and recording the output from the receiver (Speaker out, or pre-outs) using a computer, and then analysing the frequency response. It's fairly easy to do, yet requires a bit of time to do it. I was intending to have a web page up describing the method etc. by now, but haven't got around to it.

If you want the info, drop me a PM and I'll explain the process. (If I get demand, I'll do up the webpage with the testtones etc. for download)

The THX spec is 80Hz filters, the highpass being a 2nd order Butterworth, and the lowpass being 4th order Linkwitz Riley. My NAD T752 (Not THX) uses this system.
 

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