How does one find out ones reciever crossover?

Discussion in 'AV Receivers' started by BrettisMckinney, May 3, 2003.

  1. BrettisMckinney

    BrettisMckinney Second Unit

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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?
     
  2. Brett DiMichele

    Brett DiMichele Producer

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    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?
     
  3. BrettisMckinney

    BrettisMckinney Second Unit

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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?
     
  4. Lewis Besze

    Lewis Besze Producer

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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.
     
  5. BrettisMckinney

    BrettisMckinney Second Unit

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    Thanks for that. If my subs at 80hz i guess i'm missing some then...better up it a bit!
     
  6. DanielSmi

    DanielSmi Second Unit

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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
     
  7. Lewis Besze

    Lewis Besze Producer

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  8. BrettisMckinney

    BrettisMckinney Second Unit

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    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.
     
  9. Lewis Besze

    Lewis Besze Producer

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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]
     
  10. StephenL

    StephenL Second Unit

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  11. BrettisMckinney

    BrettisMckinney Second Unit

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    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?
     
  12. Jonathan M

    Jonathan M Second Unit

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    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.
     
  13. StephenL

    StephenL Second Unit

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