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Thread: Sub Port or PR

  1. #1

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    Default Sub Port or PR

    I will be using an Adcom GFA-555 for my DIY sub with a 15" Dayton Mark III, and 3 12" Polk PR's. A GFA-555 put out 850 watts clean bridged. While this may be a bit much, I also have a GFA-585 to drive 2 subs at 400 watts. We'll see what happens in the real world. First passive project besides SDA-SRS's.
    Anyone do anything like this?

    Any input from users of both type would be appreciated.
    Thanks 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

  2. #2

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    bump
    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

  3. #3

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    How big is the encloser? Too small or too big of an encloser I feel will muddy the bass responce and when using 3 12" PR, the resistance has to be perfect or everything would just be "flopping" around.
    Monitor 7b's front
    Monitor 4's surround
    Frankinpolk Center (2 mw6503's with peerless tweeter)
    M10's back surround
    Hafler-200 driving patio Daytons
    Tempest-X 15" DIY sub w/ Rythmik 350A plate amp
    Dayton 12" DVC w/ Rythmik 350a plate amp
    Harman/Kardon AVR-635
    Oppo 981hd
    Denon upconvert DVD player
    Jennings Research (vintage and rare)
    Mit RPTV WS-55513
    Tosh HD-XA1
    B&K AV5000


    Dont BAN me Bro!!!!

  4. #4

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    Quite an ambitious project. Your enclosure has to be huge to take advantage of that much surface area. Might be overkill to have that many PR's and a 15" woofer.

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass

    Pass Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

  5. #5

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    The woofer is 15 inches, and has 2 inches of stroke. It calls for a 6 cubic foot cabinet which is roughly 17*17*44. The passive only have about an inch of travel. I know I would have to add a little weight to tune them to 19hz to match the woofer. I was thinking of putting the 3 Pr's in front to match the phase of my SDA-SRS's PR's
    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

  6. #6

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    Sounds like fun! Frequency sweeps will be your friend when trying to dial that thing in.

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    My other Idea was to 16" sonotube at 50" with a 4" port on top which would also give me a tune of 19hz.
    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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    Quote Originally Posted by PolkThug View Post
    Sounds like fun! Frequency sweeps will be your friend when trying to dial that thing in.
    Yep a lot of taking the pr's out weighting them and putting them back in.

    Here is the woofer
    http://www.partsexpress.com/pe/showd...number=295-420
    Last edited by ben62670; 04-10-2007 at 11:16 AM.
    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

  9. #9

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    Quote Originally Posted by ben62670 View Post
    My other Idea was to 16" sonotube at 50" with a 4" port on top which would also give me a tune of 19hz.
    I think this idea will give you better responce than the Pr's

    The problem I have is that every Pr encloser I have seen and delt with includes a larger Pr than the driver. I have never seen it done the other way around.
    Monitor 7b's front
    Monitor 4's surround
    Frankinpolk Center (2 mw6503's with peerless tweeter)
    M10's back surround
    Hafler-200 driving patio Daytons
    Tempest-X 15" DIY sub w/ Rythmik 350A plate amp
    Dayton 12" DVC w/ Rythmik 350a plate amp
    Harman/Kardon AVR-635
    Oppo 981hd
    Denon upconvert DVD player
    Jennings Research (vintage and rare)
    Mit RPTV WS-55513
    Tosh HD-XA1
    B&K AV5000


    Dont BAN me Bro!!!!

  10. #10

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    Quote Originally Posted by ben62670 View Post
    My other Idea was to 16" sonotube at 50" with a 4" port on top which would also give me a tune of 19hz.
    You will need 6-8" of port to be able to handle the amount of air that your 15" driver is going to move.
    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

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    Quote Originally Posted by jakelm View Post
    I think this idea will give you better responce than the Pr's

    The problem I have is that every Pr encloser I have seen and delt with includes a larger Pr than the driver. I have never seen it done the other way around.
    Yeah I have 3 12"s already, and I used 2 10's with my SDA-SRS project, and it worked good. The thing I like about the smaller pr's is that they respond quicker. It would also look pretty cool with 3 twelves facing forward too. But I am more about performance than looks.
    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

  12. #12

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    Quote Originally Posted by tryrrthg View Post
    You will need 6-8" of port to be able to handle the amount of air that your 15" driver is going to move.
    I ran WINisd, and a couple other programs, and was recommended by PE to use the 4" flared port. That is another reason I was thinking about PR's. A 4" port with woofer that "15" MKIII will sweep over 3 liters of air! " means an awful lot of port velocity.
    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

  13. #13

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    Where did you steal the 585? LOL

    engtaz
    engtaz

    I love how music can brighten up a bad day.

  14. #14

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    Quote Originally Posted by engtaz View Post
    Where did you steal the 585? LOL

    engtaz
    Ebay
    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

  15. #15

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    You going to buy me one???? LOL:D :D :D :p

    engtaz
    engtaz

    I love how music can brighten up a bad day.

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    I want one too. If you get bored with the sub project just send it to me(jump on yahoo I'll give you my address) j/k. 3 12" PR's is about right for a 15". You might be able to get away with tuning it lower, and still end up with good results. Man I wish I lived down there, I'd love to be a part of that project, and you'd have an extra hand for fixing the computers at work:)
    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
    Life is short live Sui Juris
    Where did SOPA go?

  17. #17

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    Quote Originally Posted by dudeinaroom View Post
    I want one too. If you get bored with the sub project just send it to me(jump on yahoo I'll give you my address) j/k. 3 12" PR's is about right for a 15". You might be able to get away with tuning it lower, and still end up with good results. Man I wish I lived down there, I'd love to be a part of that project, and you'd have an extra hand for fixing the computers at work:)
    Come on down!
    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

  18. #18

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    Not working, so there is no way I have the fundage. I've been looking since the end of January, and there is nothing. I don't have the money to move anywhere so I am kinda stuck. If I had the money I would be there in a second, I'm sick of this cold weather. oh well life goes on.
    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
    Life is short live Sui Juris
    Where did SOPA go?

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