First HT DIY Subwoofer for a noob on a budget.. - Page 9 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #81 of 100 Old 10-05-13, 12:28 AM Thread Starter
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Re: First HT DIY Subwoofer for a noob on a budget..

MikeP, I think I figured out my crossover question. The upper bass from the 15s from 60-120hz will be as good or better than anything the little Polk can do, why cross it out. High pass the Polk to lose the chuffing, leave the big boys alone. Is that the reasoning? Have I used up all my MikeP time?
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post #82 of 100 Old 10-05-13, 07:52 AM
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Re: First HT DIY Subwoofer for a noob on a budget..

Sorry for the delay, I've been swamped. Yes, that is the reasoning. The 15's will produce the full spectrum of bass down to 20 hz, hi-pass the Polk and let it contribute what it can.

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post #83 of 100 Old 10-06-13, 12:27 AM Thread Starter
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Re: First HT DIY Subwoofer for a noob on a budget..

Cool! If ya get caught up and feel like peeking at my post #79 it would be most appreciated. Stuffing and feet stuff.
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post #84 of 100 Old 10-06-13, 02:07 AM
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Re: First HT DIY Subwoofer for a noob on a budget..

Some people say lining a ported sub has no effect, others say it does.I always do with an open cell egg crate foam a couple inches thick. Walmart pillows is another option, I personally haven't done that. I have no idea what is inside of them, I imagine some kind of poly stuffing. Here is a a read on it.

http://www.data-bass.com/data?page=content&id=79

I don't see any issue with using caster wheels.

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post #85 of 100 Old 10-06-13, 09:25 PM Thread Starter
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Re: First HT DIY Subwoofer for a noob on a budget..

MikeP, she's killing me!! I've now been told that unless I can make them multi purpose, then forget it. Our 6yr old will be doing homework soon enough. I did some research and found that I can mock the left and right side drawer cabinets of a desk into a pair of 4ft^3 boxes tuned to 21hz. With a 27in. chair space in between, and a 62in. wide top over them, I can create a desk the same dimensions of an accepted, commercially available model. I guessed based on your winisd modeling that a 2ft^3 reduction in volume required a 1hz addition in tuning frequency. 10ft-18hz, 8ft-19hz, 6ft-20hz=4ft-21hz? Do I ever reach a point where I'd be better off with one box at at 10 or 8ft^3 than two boxes at half the size?

Last edited by jeffrobinson; 10-06-13 at 11:00 PM.
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post #86 of 100 Old 10-06-13, 10:45 PM
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Re: First HT DIY Subwoofer for a noob on a budget..

The bigger the box the better so find out what you can get away with and we'll take it from there.

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post #87 of 100 Old 10-07-13, 10:57 AM Thread Starter
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Re: First HT DIY Subwoofer for a noob on a budget..

Going with what we designed. This is a fight I'm willing to have. They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety. Ben Franklin.
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post #88 of 100 Old 11-18-13, 09:29 PM Thread Starter
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Re: First HT DIY Subwoofer for a noob on a budget..

Well, my build has hit a little snag. My father-in-law (with all the woodworking tools and experience) took a fall from his 10ft stepladder while trimming trees in the front yard. Broken arm, broken ego, and the inability to bass fish has left him unwilling to teach for a while. This gives me some time to scheme a little. I've been required to find a way for a pair of 6ft^3 subwoofers to have a wife-worthy, secondary purpose. A desk it will be. A sub at each end, with a desktop above. To create the floor space required for a full size desk in the living room, I will need a tall, narrow cabinet rack for components and htpc. Is there a forum here for DIY furniture of this type? I'd love to see some home brewed racks with tricks like cooling fans and prewiring etc. Ideas anybody? I did find one incredible thread here:
http://www.hometheatershack.com/foru...t-day-1-a.html
but I'm looking for more, maybe a little more rookie oriented.

Last edited by jeffrobinson; 11-18-13 at 09:39 PM. Reason: update
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post #89 of 100 Old 11-19-13, 09:24 AM
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Re: First HT DIY Subwoofer for a noob on a budget..

You may have an interesting time dealing with nulls if you have a set location for your bass desk. I imagine you wouldn't get much WAF if you had to have the desk in the corner because that was the best placement
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post #90 of 100 Old 11-19-13, 09:31 AM Thread Starter
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Re: First HT DIY Subwoofer for a noob on a budget..

I'm afraid I do have a set location for the desk, but I think I can change the subs facing direction under the desktop if necessary. Does the direction they face address null problems?
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