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Old 6th December 2009, 07:37 PM   #1
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Default cheap Subwoofer options

Hey all, new here and I have already purchased an A/V unit, 5.0 setup, and just needing a cheap temporary sub for right now. I live in apartments so just want something while in transition and then later will build something appropriate. I want to use an old ported box that I used in the car for a single 12" IDMAX. Its about 2.9 cubic feet and tuned to 32Hz from what the builder informed me. I also have a cheap 0.85 cubic foot sealed box that I bought from parts express a long while back for a 12" so either of those boxes are options for me although it doesnt appear the 0.85 box was built very well. I also have a SA240-B Dayton plate amplifier to use with whatever sub I get.

So my question is, what sub from say parts express would be recommended for either of those boxes with the kind of power available? I dont need the sub to play any higher than 60Hz. I would like to stay around $100, preferably lower but I can go a little higher as well. I said PE because I have a $10 off $75 coupon I can use if I purchase new.

One option I do have is I can pick up a Peerless XLS 12" for $80, but I dont think it would respond very well in either of those boxes. Any and all advice is appreciated and welcomed, I would like to get something here soon. Thanks!
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Old 6th December 2009, 10:02 PM   #2
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Its about 2.9 cubic feet and tuned to 32Hz from what the builder informed me. I also have a SA240-B Dayton plate amplifier to use with whatever sub I get.
In that box and with that plate amp, without changing anything, the Peerless XLS 12" will give you 112db with an F3 of about 28Hz - all without any worry of cone over excursion - I'd say go for it !
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Old 6th December 2009, 10:07 PM   #3
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Originally Posted by Cokewithlime View Post
In that box and with that plate amp, without changing anything, the Peerless XLS 12" will give you 112db with an F3 of about 28Hz - all without any worry of cone over excursion - I'd say go for it !
Really? I dont have any clue how to figure out what size box will work with what sub. I tried to mess around with WinISD but still cant figure that out yet. But hey I guess I can go ahead and try it out, its just temporary anyway. Good to hear that it might just work out well
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Old 6th December 2009, 11:31 PM   #4
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Actually since I already own and use a Peerless XLS 12", I already had all the parameters entered into my WinISD driver library so I just plunked in your enclosure volume and what you said it was tuned to, to get the results

Since you already own the SA240-B Dayton plate amplifier ( ie the one with some LF boost) I would suggest you add about 2db of boost @ 50Hz and it should give that configuration a fairly flat response from about 32Hz to 100Hz

Without knowing the size(diameter/length) of the port in that enclosure, the only thing to worry about is port airspeed - with that configuration using anything much less than a 4" diameter port will probably result in port "chuffing" on any content below 40Hz
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Old 7th December 2009, 04:24 AM   #5
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from a quick measurement the port is 2" x 15" and its about 36" long give or take.
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Old 7th December 2009, 06:36 AM   #6
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OK, so it is a rectangular slot type port - given that sizing you won't have any issues with port airspeed.

BTW - the combination of the XLS driver, box volume and port size ends up with the combo tuned to about 26Hz - this now gives you a F3 of about 24Hz without driver over excursion issues using the Dayton amp and about 112db from 28Hz to 160Hz - you should still add about 3db of boost @ 45Hz to help even out the response curve

All in all it looks like a really decent combination
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Old 7th December 2009, 06:43 AM   #7
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I'm not sure if adding any gain around 40-50Hz is a good idea - driver excursion one octave above tuning is twice the excursion at port tuning. Adding 3dB there requires yet more excursion......

It would be goot to experiment, but I expect room gain would fill in the EBS-style dip.

After messing on winISD, excursion won't be a problem until you're pushing it...
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Last edited by chris661; 7th December 2009 at 06:47 AM.
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Old 7th December 2009, 08:16 AM   #8
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Great to hear, sounds like this will satisfy me until I can have money for a proper build Thanks guys, I went ahead and got the driver.
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