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Advice on building a Sub

Discussion in 'Subwoofers' started by jackuzi, Jun 11, 2002.

  1. jackuzi

    jackuzi
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    I have a 15 inch Sub from my mad in-car days!! It's an 8 Ohm, 800W rated speaker made by McCauley (I think it's like a JBL or something).

    I was wondering if it would be worth my while building a bass box using this Sub for my home cinema setup.

    I'd need to power it (advice please). My A/V amp is a Sherwood RD-6106R and has the usual Sub outputs.

    I don't have much money to spend (which is why I want to use this speaker) so not sure the most cost effective way to go.

    Thanks in advance for any advice.

    Glen
     
  2. lynx

    lynx
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    Aren't these speakers for dance clubs?
     
  3. jackuzi

    jackuzi
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    I'm not sure. Would that make a difference. Do you think I would be wiser selling this and putting the money towards a 'proper' active sub?
     
  4. GaryG

    GaryG
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    Glen

    The short answer is stick it in a box and try it. If you're stuck for a cheap sub amp I have a spare 300w KEF TDM45 amp that you can have for £75.

    Without the Thiel-Small parameters for the driver it's difficult to calculate the box size you will require but the bigger the better basically.

    If you need more info the following links may be of use:

    http://home.earthlink.net/~etunstal/diy.htm
    http://www.diyaudio.com/index.php?
    http://www.ecoustics.com/Home/Home_Audio/Speakers/Speaker_Articles/
    http://www.diysubwoofers.org/
     
  5. rob_w

    rob_w
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    i`ve always found this option quite interesting........

    have you noticed how nearly all car amps cater for sub x-over?

    if you could get a decent (rockford fostgate etc) car amp and big speaker in the proper size box into home cinema you could be laughing???

    the prob is how to power the 12v 60-odd amp car amps?

    good luck - i reckon it could just work!!


    rob

    btw - using twin 10" subs with 2x 6x9`s in front doors in me car................
     
  6. Ramius

    Ramius
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    Hi jackuzi.

    Yep, what GaryG said. We need the T/S parameters so we can model it and see if it's suitable.

    WinISD has all the McCauley drivers preloaded with their T/S parameters. Do you have the model number?


    robwells, check out the links GaryG posted and do a net search for 'DIY subwoofers'
    You'll find drivers and amps dedicated for home subwoofer building.

    Cheers
    Boris
     
  7. jackuzi

    jackuzi
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    Hi all and thanks for the replies,

    GaryG - Thanks for the offer of the amp. Would it be possible to put this 'on hold'? I'm getting married in 7 weeks and all the bills are currently being settled!!! Ouch!!! and if I buy this the wedding may get cancelled!!! :eek:) the sacrificies we make for our audio hehe.

    Robwells - I have a 400w Bridgable Pioneer car amp that I was using to power this driver in my car. If I could power this at home then this would be my first try. Anyone know of a cheap way to try this?

    Ramius - The speaker is in the loft at the moment, I'll go up there at the weekend and check the model number.

    Once again, thanks all...will check back soon.

    Glen
     
  8. Ramius

    Ramius
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    Hi

    Unfortunately it's not feasible to use a car amp. The cost of a quality clean high amperage power supply makes it not worth it. Just best to sell it and buy a suitable amp.


    http://www.bkelec.com/ make high quality good value mono 'raw' amp modules and subwoofer plate amps.
    The amp modules are particularly good and give the best power to price ratio.
    The build quality is excellent.
    Crossovers aren't necessary when using an AV receiver and connecting at low level.

    Cheers
    Boris
     
  9. rob_w

    rob_w
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    i was just thinking re: power supplies to car amp.............

    what about a pair of standard car batteries (in a built case for safety) wired in parrallel, and a recharge every couple of days?

    i`m sure i read somewhere that dc power from batteries is the cleanest you`ll get.......

    just a thought

    rob
     
  10. lidders

    lidders
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    you can buy an inverter from maplins, KEENE electronics etc..

    These I think only run at 100 watts but you could turn the amp down and see what it sounds like!!

    They are approximately £40!

    I run Rockford Fosgate in my car excellent stuff....

    MDF boxes are simple to build but remember to use plenty of hot glue and Sikoflex to seal them, If you dont get it the first time there a bugger to do later. took weeks on my car but that was made in two seperate section!!

    LIDDERS
     

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