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Old 2nd March 2014, 12:39 PM   #1
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Default Old pd.182. What to do..?

Hi. Got hold of an old (but hardly used) pd.182. Thought I would build a (sub)woofer for my old man. The x-max limits ultra low end, but what would you do? Any suggestions (exept selling and buying something else) will be appreciated. Music is the main thing here. Not HT.

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Last edited by teddytusen; 2nd March 2014 at 12:56 PM.
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Old 2nd March 2014, 02:55 PM   #2
GM is offline GM  United States
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Greets!

Well, selling it would be pretty far down by list of choices since I prefer ~critically damped alignments using high Vas, low Fs, Qts drivers obviously designed for pounding high SQ mid bass in a relatively small cab or big horn, so to the first approximation a Vb = Vas, Fb = Fs yields a T/S max flat alignment if some form of EQ is used to raise the effective Qts to ~0.403, so a bit less EQ/net Vb if a higher tuning is required and a bit more if tuning lower. TL or MLTL alignments preferred.

Since this eats up LF dynamic headroom, getting as much room gain as practical is desirable, so hopefully there’s a usable corner available. That, or place it near the listening position [LP] in a coffee table or similar.

If corner loaded, then the cab can be smaller and/or tuned lower to get the desired ~flat in-room response. EQ’d sealed may be enough considering you reside where homes are much better constructed than where I live.

If space, weight, build cost isn’t an issue, then some form of pipe horn [tapered TL such as the ‘BIB’] would be my choice, but then I like to listen to low B pipe organ symphonies, so need at least a 16 Hz tuning; otherwise, a ~27.5 – 32 Hz tuning to get the lowest note on a Concert Grand piano suffices unless he listens to some of the newer electronic stuff that I’m told needs a somewhat lower tuning. The main thing is that if vented, one ideally wants a tuning no higher than ~ 1.22x the lowest note to be reproduced and preferably at or below this frequency.

GM
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Old 2nd March 2014, 03:30 PM   #3
bjorno is offline bjorno  Sweden
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Hi,

Here is an idea:

b
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Old 3rd March 2014, 04:17 PM   #4
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Thanks for putting in your time and effort gentlemen.

I am not that good at reading these technical posts, but a 154liter tapped horn with a f3 tuned to about 30hz is what I get out of it. This is absolutely doable. Is there a cut-sheet option in Hornresp bjorno..? A "hey presto" button of sorts..?

The (sub)woofer will be placed in a corner. (unlike Baby ) In addition this is a loft/attic with slanted roof. The speakers under one slant and listening position under the other. (dont know how to explain this better in english...) Distance between is about 3 meters. The woofer would "see" about 30-35m2. The slanted roof means that the m3 will be smaller than a normal 30-35m2 room.

EQ will be done by minidsp, and a PA-amp will provide power. (make and model yet to be desided)

Sealed would be great GM, but then I presume that 30-40hz would be out of the question..? Even with EQ..?
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Old 3rd March 2014, 06:26 PM   #5
GM is offline GM  United States
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Yes, you can EQ it to this low, just that how much peak SPL is available will depend on how much room gain you have. Around here +6 dB is a lot, but up to +9 dB is possible in well constructed rooms, though I imagine the TTQWT will play at least as loud at lower power until of course audible distortion forces you to back off the volume control a bit.

Anyway, looks like ~104 dB/m in half space is the Xmax limit, so figure at least 110 dB/m in a corner and maybe a bit more.

GM
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Old 3rd March 2014, 08:19 PM   #6
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My dad listens mostly to blues, at levels between 80-95db.

What would be a sufficient size sealed enclosure? How much power should be at hand?
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Old 4th March 2014, 03:37 PM   #7
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by teddytusen View Post
..This is absolutely doable. Is there a cut-sheet option in Hornresp bjorno..? A "hey presto" button of sorts..?
Hi

Yes it is. No cut-sheet but you can print out a dimensioning record from HR:
Here is just a pixel doodled suggestion:

b
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Old 4th March 2014, 04:32 PM   #8
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Thanks again bjorno.

This is a tossup between sealed and TH. Sealed is tempting because of size and ease of build, but I have built several speakers and subs before so TH is not out of the question. Any suggestions on size for the sealed option?

Sidenote... I have two pd.186 waiting for a BR-enclosure (I already have two in my HT). I must say that it is tempting to use one sealed for my living room...
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Old 4th March 2014, 05:25 PM   #9
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by teddytusen View Post
.. Sealed is tempting because of size and ease of build, .... Any suggestions on size for the sealed option?...
IMO:

b
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Old 5th March 2014, 04:10 PM   #10
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He he. Okay... It seems that you and GM dont see eye to eye here.
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