Canidate for HT Sub

Discussion in 'Archived Threads 2001-2004' started by Christopher Collins, Oct 7, 2002.

  1. Christopher Collins

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    I have this boston pro 12" sub laying around and thought I might put it to some good use in my home theater. I have built a few enclosures for automobiles but have very little experience in building them for home use and would like to start with this.

    Can anyone out there let me know if this would make a decent sub for HT use? Also where would I look to find a plate amp for this as it is rated at 1200 watts?

    Here are the specs on the sub.

    FA 31hz
    VAS 84 liters
    Qts 0.57
    Qes 0.61
    Qms 9.6
    Cms 230um/N
    Mms 117g
    Sd 510cm2
    VC Diamater 51 mm
    Re 3.1ohm
    Le 0.55mH
    Xmax 8.5mm
    P-P Excursion 40mm
    Ref Efficancy 0.39

    Thanks ahead for any input!
     
  2. Christopher Collins

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    From searching around I found that Adire has a nice plate amp. The HS500 looks to be something along the lines of the same specs that I push the Bostons in my car with. Here is a link to the specs.
    http://www.adireaudio.com/Merchant2/...tegory_Code=60
    If anyone could take a stab at telling me if this sub would be ok matted to a HT I would really appreciate it.
     
  3. The driver models ok for a sealed box at around 100L with heavy fill. DO NOT use this driver ported.

    You DO NOT need anything near a 1200watt amp. you only have 8.5mm of x-max that you want to work with (even though you can drive it into distortion/damage at high as 20mm). A 200watt plate amp will do you just fine.

    For HT, don't expect to get the sub playing real low really loud. You will want to use a bass boost on this setup (about 4db at 30hz).
     
  4. Chris Carswell

    Chris Carswell Supporting Actor

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    A braced & stuffed 17" cube put in the corner of the room mated with the PE# 300-796 amp should work out ok.
    Like Anthony hinted at:
    I take it the xmax is correct (8.5mm) but the p-p is wrong (40mm???...hmmmm [​IMG] ......don't think so). Should be more like 20mm or the original xmax would have to be more like 18.5mm to reach 40mm p-p.
     
  5. Christopher Collins

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    double post
     
  6. Christopher Collins

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  7. Christopher,

    you wrote it down right. Here is my take on it.

    The 8.5mm one way linear xmax is probably accurate. the 40mmp-p is also probably accurate.

    ...but boston probably defines the 40mm P-P max is the total about of travel that the suspension can "stretch" to before the surrounds tears off of the cone, or basket, or till the surround splits, or till the spider splits.


    for all intensice purposes, keep your driver to withing 8.5mm one way, but allow maybe 12mm for transient peaks (just realize that it will be a distorded waveform).
     
  8. Christopher Collins

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    Ok i think that ill keep the boston and ad it to my set of 2 in the car at a later date. Has anyone given the w7 subs any thought for HT use?
    I was eyeballing the 13w7 the TS params are on page 3 of the pdf. Perhaps this would be more suitable than the Boston? If i read this right the xmax is 32mm!!!
    http://www.jlaudio.com/subwoofers/pdfs/W7_DS.pdf
     
  9. Dustin B

    Dustin B Producer

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    Chris, it is a cool driver, but way too much money. From the * you can be pretty sure that DUMAX would report a shorter Xmax. Reguardless that much Xmax provides a Vd of just over 4L with the 13" driver.
    A little over 4L and $430:
    http://www.adireaudio.com/car_audio/...hma_series.htm
    5.3L and should be less than $400:
    http://www.acoustic-visions.com/tumult.htm
    3.8L and on preorder is only $165:
    http://www.acoustic-visions.com/strykeavseries.htm
    There are some new versions of the HE15 (~$400 and a chunk more) that are in the 4L and over 5L range:
    http://www.stryke.com/SATser.html
    A little over 4L and $240:
    http://www.missiondigital.net/product.asp?productid=8
    A little over 6L and $280:
    http://www.missiondigital.net/product.asp?productid=21
    And if you can do something like this:
    http://home.tampabay.rr.com/kraushome/IB.html
    Parts Express has a suitable 15" driver for $100. Four of them in a manifold will give you almost 10L of Vd.
    Some of these have inductance humps and absolutely require EQ, but considering how a sub interacts with a room and that a decent EQ can be had for a little over $100, the EQ should be considered standard.
     
  10. Chris Carswell

    Chris Carswell Supporting Actor

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    Ahhhhh..... so that's where they have been hiding: http://www.missiondigital.net/
    I have been trying to reach them at this link
    http://www.blueprintdrivers.com/
    forever but no luck. I thought they closed shop. Thanks for that Dustin [​IMG]
    BTY - No DCV 15" or Tempest? As much as you recommend those I would have thought they would be 1st on your list [​IMG]
    My $.02 = I think the Stryke AV15 on Pre-order is the best bang for the buck going. Of course this is hoping the final product will be close or better than the original #'s.
     
  11. Dustin B

    Dustin B Producer

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    Those are the best currently available budget drivers, yep. But at only 2.5L of Vd they are starting to show their age. Still kick the crap out of just about anything commercially available though. And if you got the space, $300 will buy 2 Tempests and the enclosure volume requirements for the Tempest make porting that much Vd easy.
     

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