Picking a sub - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 9 Old 06-01-2011, 07:59 AM - Thread Starter
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I've been considered putting a woofer in my weight room to go along with my current speakers and receiver. I am currently running an older Yamaha Natural Sound Stereo amp A-28 with two Yamaha NS-A100 speakers. I'd like to add a woofer to have some extra bass with my music. The dimensions of the room are 92 inches high, 235 inches long, and 130 inches wide. I'd like to make a box for the woofer around 4-6 cubic feet, I'm not really sure what the tuning should be, I've built a few systems for cars but never for home use. I would like to keep the budget as low as possible, so I'd be fine with a used amp and woofer. My music preferences are mainly rap. All the help I can get would be appreciated, thanks. I was looking around and would a mfw15 be good? I saw there was a group buy for it, http://www.diysoundgroup.com/MFW_15.htm
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post #2 of 9 Old 06-01-2011, 09:57 AM
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for rap, you want to hit big bass from about 35-50hz.

i modeled up that mfw driver for you to optimize as a rap machine. this one is 6 cubic feet tuned to 28hz with a 6 inch port that is 11.75 long.

it creates a peaked frequency response that will resonate just a little bit, which is good for rap as it provides a little more spl in the target region.

with a 500 watt amp, you will run out of thermal capability and excursion capability at about the same time. i wouldn't run full power sound waves through that driver, but otherwise you should be fine.


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post #3 of 9 Old 06-01-2011, 01:01 PM - Thread Starter
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What would be a good amp to power that sub. Would it be a good idea to buy a used amp to keep the budget down or would I be better off buying a new one?
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post #4 of 9 Old 06-01-2011, 01:21 PM
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that is kind of up to you. parts express has some decent options.

http://www.parts-express.com/wizards...ofer+amplifier

this one might be a good one if price is the biggest concern. at 240 watts, it will provide about 3db less output than a 500 watt model, but 500 watt models cost more money, usually in the ~$235 ballpark or so.

http://www.parts-express.com/pe/show...number=300-804

even at "only" 240 watts, that amp with your bass bin will blast some serious bass. you are on the right track.

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post #5 of 9 Old 06-01-2011, 02:30 PM - Thread Starter
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Yea I'm trying to keep the budget as minimal as possible. All of this home audio is completely new to me, but I've built a few car audio systems. I currently have a 15" mach 5 ixl.1.1 with a sundown 1000 watt amp in a 3 cubic ft box tuned to 35 hz and it sounds great. If I would build that 6 cubic ft box you suggested at 28 hz is there any dimensions on it or should I just look for a design? Thanks
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post #6 of 9 Old 06-01-2011, 02:36 PM
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Use this to calculate volume. Make the enclosure how you want but stay close to 6cu ft.

http://www.hometheatershack.com/foru...me-calculator/

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post #7 of 9 Old 06-01-2011, 03:49 PM
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that is a great link mrka. the dimensions aren't important. include a little extra volume for the driver and the port. put some bracing between the walls of the sub, just simple 1x2 cross bracing, but a very important thing is to make sure the cabinet and the driver are both air tight. use extra glue, calk, pl premium or whatever to make sure the panels fully sealed up.

enter these numbers and then fart around with the exterior dimenions above until you get some dimensions that you like that give about 6 cubic feet.


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post #8 of 9 Old 06-01-2011, 03:54 PM - Thread Starter
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Thanks for the help I'll post pictures when I'm finished
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post #9 of 9 Old 06-01-2011, 04:15 PM
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no problem. good luck with your build. if you get stuck on something there is a ton of experience around here waiting to help.

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