Speakers for an actual bookshelf - seeking woofer recs. - diyAudio
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Old 27th November 2012, 11:19 PM   #1
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Default Speakers for an actual bookshelf - seeking woofer recs.

I know, I know, but it's a request from a family member to replace speakers that are not coming off the shelf, period. It's also being done on the cheap. So, I'm looking for CHEAP (~$40 USD/each) woofer suggestions for a pseudo-in-wall 2-way. Here's the specifics:

- small 2-way for use inside an in-wall bookshelf. They don't actually have to be super small volume-wise - there's an approx. 30 cm cube of space to work with, so maybe 20 liters. I figure 5" to ~7" woofers are workable with that baffle height.

- I generally understand how this kind-of-in-the-wall situation will affect things, but if anyone has any hands-on tips for what kind of bass sim targets give good results in this flawed speaker location, I'd love to hear it.

- I think I'll probably use an old Genesis 1" inverted dome tweeter, which does well enough on its original ~2kHz (electrical) 1st order filter. I don't intend to end up with the same filter, but a woofer that could meet that easily would be a nice starting point.

- Impressive bass is not needed, but there will NOT be a sub so there's got to be some. It would be nice to hit ~90dB sensitivity because there's not much budget for amplification, either.

I think that pretty much covers it. For crossover design, these will be measured and simulated to the best of my basement capabilities. Any thoughts? I was thinking about the M130... Several Peerless options, but I think they are all pretty severely excursion limited on a full-range signal? I'm not sure, it's hard to keep their model numbers straight.
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Old 29th November 2012, 12:58 AM   #2
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i suggest trying a kit from one of the online supply stores, probably better than trying it yourself.

rock bottom price but not a lot of bass would be these with a front vented cabinet, i havent heard them but the drivers are used in some more expensive designs.
The Madisound Speaker Store

I have built these and they reach very low but lack a bit in the low-mids, very nice tweeter though for good high end detail.
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not sure if that was the advice you are looking for
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Old 29th November 2012, 01:26 AM   #3
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Currently very agressively priced. Decent bass, excellent midtange. Worksnicely in about 9 litres.

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community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
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Old 29th November 2012, 02:45 PM   #4
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That is a nice price on the CHBW-70, although I must say the M130 seems a lot more appealing at a glance. I haven't heard either.
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Old 29th November 2012, 03:45 PM   #5
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I'm thinking you would need a horn or wave-guide of some type, to keep those frequencies out of the bookshelf cavity.
How about some type of coaxial?
The KEF driver maybe?
Cross it around 2kHz and then tailor the woofer with passives (to combat the bookshelf cavity)

.....jeez, the price on this unit is going up and up!........

Last edited by Melo theory; 29th November 2012 at 03:50 PM.
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Old 29th November 2012, 04:15 PM   #6
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Well, it would be positioned flush with the front of the shelf, but yeah, there'll be some diffraction/etc. weirdness I'm sure, and that's okay. I would give the Denovo mini a try if Erich was taking orders right now.
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Old 29th November 2012, 04:25 PM   #7
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Zaph|Audio - ZA5 Speaker Designs with ZA14W08 woofer and Vifa DQ25SC16-04 tweeter

Scroll down until you reach ZA5.2iw.

The Madisound Speaker Store and select the in wall version.
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz! Now with website! www.5een.co.uk under construction.
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Old 29th November 2012, 04:41 PM   #8
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That kit is a bit overbudget and I want to design something anyway, although the woofer is certainly an option at the top of the budget range.
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Old 29th November 2012, 05:00 PM   #9
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I suggest you seek out the biggest midwoof you can squeeze in and use a directional midtweet to keep the bookshelf artifacts to a minimum.

Think "directivity matched waveguide 2 way"
"The dawn of Bose created the "Man Cave" and reduced testoterone levels worldwide by 18.5 per cent" Peteleoni
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Old 2nd December 2012, 11:46 PM   #10
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How about Dayton RS180-8 vs Silver Flute W20RC38-08?
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