60HZ peak

briancs
briancs Posts: 193
edited February 28 in Clubhouse Archives
I don't have a cal disc for my new sub but my neighbor brought over a test tone generator. That thing was cool! But anyway, While we were checking the subs responce we both noticed that at around 60HZ a very noticeable peak. I have since came to the belief that the room acoustics is the culprit. But my question is. What can I do about it? The woofer was not in a corner (where it normally is) during the test it was in front of my entetainment center. Should I rerun the tests to see if it does the same in a corner? Thanks
The guy with $40.00 mains and a $700.00 subwoofer.
Post edited by RyanC_Masimo on
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  • F1nut
    F1nut Posts: 50,657
    edited July 2002
    That would be the logical thing to do!
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

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  • mantis
    mantis Posts: 17,200
    edited July 2002
    I would set the system up as you use it day to day.Testing where your peaks are is a really good thing.
    Getting rid of a 60hz peak will be difficult.150hz and up are easier to control.Put the sub back iin the corner and then pull it out at least 1 foot by 1 foot to start.By moving the sub slightly away from the back wall ans side wall you can decrease the peaks.Taks a heavy pillow and put it behind the sub, this will act as temp bass trap.
    Another better way to control peaks..........hold up,what speakers do you own and how are they setup?If everything is in small,its just the sub that has the peak.It could be the room,placement and treatment can cure it.
    Dan
    My personal quest is to save to world of bad audio, one thread at a time.
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  • Lee Bailey
    Lee Bailey Posts: 71
    edited July 2002
    You'll need to get a parametric equalizer, like the ART 351. If it is a powered sub, you can hook up the EQ between your receiver and sub, otherwise, you'll need to have preamp in and outs to put the EQ into your system. You can just tune down the 60 hz hump.
    Please feel free to visit my Home Theater Page at The Bailey's Home Theatre in our Living Room.
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  • briancs
    briancs Posts: 193
    edited July 2002
    Mantis only the sub has a noticeable peak. The sub was away from any corners it was in the middle of the room one way, and about four feet off center the other way. No other speakers that I have noticed have as much of a peak. But, I believe they are cut-off at about 80HZ by my receiver everything but the mains are set to large. So I believe the Velo is getting everything below 80.
    Lee where can I get an EQ such as the one you reccomended? Also what is a good ballpark figure on the cost? Mantis due to me renting I don't believe there is a lot of room treatment I can do. Or are their small (non cosmetic) things that add up? Again thanks guys
    The guy with $40.00 mains and a $700.00 subwoofer.
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  • mantis
    mantis Posts: 17,200
    edited July 2002
    Yes ,
    placing a pillow behind the sub might do the trick,but the peak might be coming from somewhere else.With the test tone generator you have set it to manual at 60 hz ,with a spl see where your dips and peaks are.

    Heres a cool easy way to treat your room without spending little or no cash.Think of your room as split in half.From the middle of the room to the front end,you want to deaden as much as possible,pillows curtians,rug,well padded chairs,etc.
    The other half from the center to the back can and should be reflective or difussive.The ceiling can be reflective as well.The very back wall should be diffusive,like a bookcase filled with books of different sizes and shapes.This works extremly well.
    Locating your peak isn't going to be easy.Take your time you'll find it and treat it with a pillow or something absorbive.
    Good luck man...O the eq isn't a bad idea but without the proper mics and software, it can be a real pain to use, you can actually mess it up worse.
    Dan
    My personal quest is to save to world of bad audio, one thread at a time.
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  • goingganzo
    goingganzo Posts: 2,793
    edited July 2002
    get a bfd
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  • briancs
    briancs Posts: 193
    edited July 2002
    What is a BFD??:confused:
    The guy with $40.00 mains and a $700.00 subwoofer.
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  • goingganzo
    goingganzo Posts: 2,793
    edited July 2002
    Behringer Feedback Destroyer it is a PARAMETRIC EQ
    here is a link
    http://www.snapbug.ws/bfd.htm
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  • Lee Bailey
    Lee Bailey Posts: 71
    edited July 2002
    Originally posted by briancs
    Lee where can I get an EQ such as the one you reccomended? Also what is a good ballpark figure on the cost? Mantis due to me renting I don't believe there is a lot of room treatment I can do. Or are their small (non cosmetic) things that add up? Again thanks guys

    SVS sells them on the web here: SVS Amps and EQs .
    Please feel free to visit my Home Theater Page at The Bailey's Home Theatre in our Living Room.
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  • RuSsMaN
    RuSsMaN Posts: 17,987
    edited July 2002
    What sub are we referring to here? Just curious...

    (in the original post)

    -R
    Check your lips at the door woman. Shake your hips like battleships. Yeah, all the white girls trip when I sing at Sunday service.
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  • briancs
    briancs Posts: 193
    edited July 2002
    Velodyne CHT15
    The guy with $40.00 mains and a $700.00 subwoofer.
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  • hoosier21
    hoosier21 Posts: 4,413
    edited July 2002
    bump, so I don't have to look so damn long next time.
    Dodd - Battery Preamp
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    DIY Stereo Subwoofer towers w/(4) 12 drivers each
    Crown K1 - Subwoofer amp
    Outlaw ICBM - crossover
    Beringher BFD - sub eq

    Where is the remote? Where is the $%#$% remote!

    "I've always been mad, I know I've been mad, like the most of us have...very hard to explain why you're mad, even if you're not mad..."
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  • Larry Chanin
    Larry Chanin Posts: 601
    edited July 2002
    Originally posted by briancs
    I don't have a cal disc for my new sub but my neighbor brought over a test tone generator. That thing was cool! But anyway, While we were checking the subs responce we both noticed that at around 60HZ a very noticeable peak. I have since came to the belief that the room acoustics is the culprit. But my question is. What can I do about it? The woofer was not in a corner (where it normally is) during the test it was in front of my entetainment center. Should I rerun the tests to see if it does the same in a corner? Thanks

    Brian:

    If your peak is exactly 60Hz, and your room dimensions don't predict a peak at 60Hz, then I would first look for room noises contaminating your measurements before going much further.

    Recently I used some acoustic software to measure my room's acoustics in preparation to equalizing the 8 channels that comprised my home theater setup. I ran into a number of complications, but one of them was a peak at exactly 60Hz. It turned out to be noise coming from my fish tank filters contaminating my measurements.

    Chances are that you don't have this problem since you are not measuring the 60 Hz peak with other speakers, but it doesn't cost you anything to check for noises before you buy a Behringer. By the way, do you have room dimension of 9.4' or 18.8'? I believe a 9.4' dimension would produce a 60Hz peak and an 18.8' dimension would produce a second harmonic peak at 60Hz.
    Originally posted by mantis:

    O the eq isn't a bad idea but without the proper mics and software, it can be a real pain to use, you can actually mess it up worse.

    I would like to second mantis' caution about proper measurements before attempting to use an equalizer.

    You can read about my struggles with equalization and measurements here:

    Adventures in Room Equalization Part II
    Larry's Home Theater
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  • briancs
    briancs Posts: 193
    edited July 2002
    Larry thanks for the input. Though I must confess I have moved, and my new living room is 12'x24'. With my new living room I have been unable to detect any peaks in my sub with various music or movies. Unfortunately I know longer have acess to the test tone generator. If you could check out my post entitled "help new house", and tell me if you feel I have done what is right it would be vastly apreciated. Unfortuneately I was unable to get any helpful input. The guys did like my attachment though, and they were sure to comment on that. Which was somewhat disillusioning to me so since then I have not really posted much, and will not be attaching any more hotties. Again Thank You!
    The guy with $40.00 mains and a $700.00 subwoofer.
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  • briancs
    briancs Posts: 193
    edited July 2002
    Oh and that is ONE HELL OF A SYSTEM YOU HAVE!! Did I see correctly an 8.1 set-up? I must say I did not read much. Just counted the speakers on the list. And looked at the pics.
    The guy with $40.00 mains and a $700.00 subwoofer.
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  • Larry Chanin
    Larry Chanin Posts: 601
    edited August 2002
    Brian:

    Thanks.

    I have ten speakers if you count the subwoofers and rarely used rear center speaker, but only eight separate channels on playback. I consider my system a 7.1 system.

    The Lexicon processor does an amazing job of taking source material with two to six discrete channels and creating seven independent channels (plus the eight LFE channel) on playback. However, no matter how many speakers I add to the system it is still limited to 7.1 channels.

    Larry
    Larry's Home Theater
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