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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.
Classix II Kit Pr

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.

The Madisound Speaker Store

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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?
http://reconingspeakers.com/products...entric-driver/
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!........
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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.
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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"
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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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