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  1. #1

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    Default [B]I need help tuning SonoSub![/B]

    As I thought. Lame pre for sub control. The HK would work nice with powered sub amps that have built in crossovers, but not for straight amps. Curve was very disappointing. I think my port is way to short!
    10-68
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    240-68
    260-64
    300-70
    Given that this is in room, in a corner I do realize that there are acoustics involved, but the low dip sucks. 10-25hz

    Here is the link on the build
    http://www.polkaudio.com/forums/showthread.php?t=51533
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben

  2. #2

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    Actually, that's not bad. You are pretty flat from 30-80Hz, with a little peak in the low-mid 40's. Not to shabby for just hooking it up and measuring.

    First of all, let the driver break in for a good 100 hours before trying to correct anything, to avoid the dog chasing it's tail scenario. Second, make sure you are using correction factors for your meter, and the right software. That can make a HUGE difference.

    As far as the port, you need to model the driver in a good program, like WinISD to get that straight. As far as placement, the corner is probably the worst place. You excite ALL the room resonances, which makes the apparent distortion from the subwoofer seem less and while you also get reinforcement of fundamental tones from all the reflections in phase from the adjacent walls - at the same time harmonics will suffer and be weaker than the fundamental itself.

    Technically, no adjacent surface for corner placement should be at a longer distance than 1/8 of the wavelength from the subwoofer at any given frequency in it's range. - Ie, the sound will travel a quarter-wave (1/4) there and back and literally mute itself.

    For now, let it break in, and move it somewhere between the 2 main speakers.

    Cheers,
    Russ
    Check your lips at the door woman. Shake your hips like battleships. Yeah, all the white girls trip when I sing at Sunday service.

  3. #3

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    I am using realRTA as a tone generator, and a rat shack SPL meter. Also between my speakers is the movie screen. This sucker is almost 7 feet tall!
    Thanks for the encouragement Russ.
    Ben
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben

  4. #4

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    Good advice Russ
    engtaz

    I love how music can brighten up a bad day.

  5. #5

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    your computer could also be dropping the output off. burn tones to a disk and try again.
    Speakers:SDA2a, sub:Atlantic Technologies 172 PBM
    Pre:B&K PRO-10MC(2ch)
    Amps:Parasound HCA 1000a
    SourcesOppo DV-970HD, Xbox360, Kenwood KT-5300
    Cables:Philips/RCA/Monster

    Life's short, Listen to SDA's
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    Where did SOPA go?

  6. #6

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    I'm not dissatisfied with the output at all. I just stepped in my office which is about 60' away, and 2 walls. The clock on the wall was rocking back and forth pretty good. Also a door hinge was making a terrible requite. I moved it away from the corner, and it definitely helped kill the booms.
    Thanks Guys
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben

  7. #7

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    Quote Originally Posted by dudeinaroom View Post
    your computer could also be dropping the output off. burn tones to a disk and try again.
    I took your advice, and inserted a test tone CD. Much better but I am not where I want to be yet. I'll let it break in for a while before I lengthen the port.
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben

  8. #8

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    girls over today?
    engtaz

    I love how music can brighten up a bad day.

  9. #9

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    Quote Originally Posted by ben62670 View Post
    I am using realRTA as a tone generator, and a rat shack SPL meter. Also between my speakers is the movie screen. This sucker is almost 7 feet tall!
    Thanks for the encouragement Russ.
    Ben
    like Russ said, did you use the correction factors for the Rat Shack meter? It can be off by as much as 10+ dB's at 25hz and below.
    Sony KDL-40V2500 HDTV, Rotel RSX-1067 Receiver, Sony BDP-S550 Blu-ray, Slim Devices Squeezebox, Polk RTi6, CSi3 & R15, DIY sub with Atlas 15

  10. #10

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    Quote Originally Posted by tryrrthg View Post
    like Russ said, did you use the correction factors for the Rat Shack meter? It can be off by as much as 10+ dB's at 25hz and below.
    I have no idea about how to go about that.:o
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben

  11. #11

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    Here are the factors from the SVS site. I had an excel file that interpolated all the frequencies in between but it must be on my old computer. But this gives you something to start from.

    But you should probably make sure that TrueRTA isn't already compensating for the rat shack meter...

    At 10Hz add 20dBs to the meter's readings and at ...

    12Hz add 16.5dB
    16Hz add 11.5dB
    20Hz add 7.5dB
    25Hz add 5dB
    31.5Hz add 3dB
    40Hz add 2.5dB
    50Hz add 1.5dB
    63Hz add 1.5dB
    80Hz add 1.5dB
    100Hz add 2dB
    125Hz add .5dB
    Sony KDL-40V2500 HDTV, Rotel RSX-1067 Receiver, Sony BDP-S550 Blu-ray, Slim Devices Squeezebox, Polk RTi6, CSi3 & R15, DIY sub with Atlas 15

  12. #12

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    Thanks try. I have been doing a little research, and thought that my sub was off, but it looks like I am very close. I was just using true RTA as a signal generator, and reading directly from the rat shack meter :-)
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben

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