Where can I purchase high end components to build a DIY POWERED sub? - diyAudio
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Old 7th March 2001, 12:30 AM   #1
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I'd like to build a DIY powered sub, trouble is, I don't know where to purchase very high quality items, such as the amplifier, the variable crossover, the driver, etc. I'd also like to build this unit with a remote controlled volume control. Do any of you know where these types of items can be found? Thanks.
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Old 7th March 2001, 01:52 AM   #2
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You might try looking at http://www.partsexpress.com.
They have amps (Class D or something, they're pretty small to be putting out the wattages they claim) and drivers and prefab boxes. Pick and choose how much you want to handle yourself. I'd be suspicious of the sound quality of those little amps, though. The boxes and drivers should do you just fine. There are numerous DIY amps out there that might suit you. Hit the amps section, then links.
Good luck.

Grey
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Old 7th March 2001, 01:49 PM   #3
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Default Drivers

For nice drivers try lambda acoustics or tc sounds, there are others of course but I've heard the most about those two. There are several lambda drivers at stryke.com and that is the only place I can point you to buy a tc sounds driver. I believe stryke carries the he15 from tc sounds which is a really serious driver. I just heard somthing about a sv18 from aci concepts (subwoofers.com) which looks pretty serious also. Both the sv18 and the he15 would need more than 1000 watts to push them anywhere near there limits. The lambda's will not need nearly as much power.

If you don't have any software I suggest finding some. There is plenty of freeware out there. I used perfect box and a spread sheet from http://www.diysubwoofers.org/. Good luck and have fun,

Wade
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Old 9th March 2001, 04:06 PM   #4
Eric is offline Eric  United States
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Lightbulb 12

You might want to have a look at the audiomobile Mass driver line. They are originally intended for car use, but myself and many others have used them as home subs with excellent results - outperforming many sub with a far higher pricetag. You can find some reviews on their web page, as well as here.
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Old 10th March 2001, 01:58 AM   #5
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There seems to be quite a few sources for purchasing the drivers, but things like remote controlled volume control units and variable crossovers seem to be the most difficult to find. Any suggestions?
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Old 10th March 2001, 02:10 AM   #6
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Also, if I decide to go the route of using car audio drivers, I can get MTX from a distributor at dealers cost. Their top of the line drivers are certainly amoung the best available. The trouble seems to be finding an amp powerful enough to really make them sing in a DIY home theater application. To get full performance, they would need at least 400 watts, preferably 500-600 watts each. Where can I find an amp that makes that much power?
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Old 11th March 2001, 08:51 PM   #7
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Default amps

I've heard good things about Crown amps for high power can't comment on where to get them. Be careful with car subs some are not suitible for home use as they rely on high cabin gains to pick up the bottom end. There are of course some that are perfectly fine for home use. Plug the ts parameters into one of teh box programs and see how low they will play. You will still pick up some room gain the
-8db point will probably be a more realistic bottom end then the -3db point.

Wade
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Old 13th March 2001, 02:31 PM   #8
Eric is offline Eric  United States
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Lightbulb Car vs. Home subs

Wade: This is exactly why I chose the Mass 2012 driver from Audiomobileinc.com - although intended for a car, it simulates *AND PERFORMS* FLAT to below 20Hz. In my 145L vented box, I get flat response down to 15Hz. But your warning is well founded, I think you'll have a hard time getting ANY response out of an MTX driver at 15Hz or even 20Hz. Absolute best thing to do is get the T/S parameters for the driver and plug them into a simulation program. You can download WinISD for free. It works quite nicely. Any competent driver manufacturer will have the T/S parameters posted on their web page for all of their drivers.
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Old 13th March 2001, 02:57 PM   #9
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Default Those looked pretty nice

I looked at the automobile subs. I think they were a little pricy for me and I was wife limmited to about 40 litres. The sb 10 I ended up with does very well for a small sub. I don't have any measurements, but the in room f3 should be about 20hz. How much did that sub weigh, If I remember correctly it had an insane motor. Your right there are some car subs that would work very well for home use, usually not the typical circuit city offerings though.

The ts parameters to look for would be a low fs around 20 and a large x-max 12mm+ the circuit city type subs will tend to have a linear x-max of 8mm or less and an fs of around 30hz. I'm sure there are exceptions but that is what I saw when I was looking.

Wade
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Old 13th March 2001, 03:04 PM   #10
Eric is offline Eric  United States
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Cool One Heavy Sub...

Wade: The Mass 2012 driver weighs in at 30lbs. all by itself! I used "sonotube" and MDF for my enclosure. Two layers of 0.75" MDF on top and on bottom. The enclosure by itself weighs almost 70 lbs. so the total weight for the sub is 95-100lbs. I think you can get away with a smaller cabinet for a sealed sub - mine is a little larger because its vented. Put a table cloth over the top of it and it looks like an end table, "hiding" nicely in the corner.

You are absolutely rights about choosing a driver for a sub, I'd look for one with Fs as close to 20Hz as possible, and look for a MINIMUM xmax (one way, NOT peak-to-peak)of about 10-12mm. The Mass driver has Fs of 22Hz and xmax (one way) of 19mm. Lots of bass out of that puppy!
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