Ideas for efficient IN-WALLS?!?! - diyAudio
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Old 31st August 2013, 07:27 PM   #1
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Default Ideas for efficient IN-WALLS?!?!

I know, I know, in-wall is not the best, especially if you're not doing major constructive surgery. But at some point, we will change our DLP for a flat TV, and I don't want to continue with the slim Infinity towers I have. They are nice, but low sensitivity. I want to get back to efficient, open-sounding drivers.

I'm open to what type-could be a two-way or maybe a good fullrange driver. I seem to remember Polydax had some 6" that were like 96 dB sensitivity, then I would need tweeters to match. And I know there are some (very expensive?) fullrange drivers which then have no crossover. I'll probably build a sub into the ceiling so the bottom end is not a big concern, it is OK if the bass rolls off kinda high.

On the other hand, drivers need to be 3.5" or with drywall thickness maybe 4" max.

Ideas?
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Old 31st August 2013, 08:12 PM   #2
xrk971 is online now xrk971  United States
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Check out the In the wall back loaded horns thread here:

In-the-Wall Back Loaded Horns

With a Fostex FE166 you can get 95 dB to 100 dB of bass output with 1 watt. It reaches pretty low down to the 20's Hz.

Click the image to open in full size.

Another option is a flat, on-the-wall Cornu speaker:

Ever think of building a Cornu Spiral horn? Now you can!

Here is sim of Cornu with a TB W5-1611 at 3 meters away from wall.

Click the image to open in full size.

Last edited by xrk971; 31st August 2013 at 08:17 PM.
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Old 31st August 2013, 11:35 PM   #3
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Hmmm, a horn folding on itself. Well, that would require major wall surgery, but it's certainly an idea. I'm also encouraged to see what I presume is a decent full range (Fostex FE166e) is not too expensive at $75ish.
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Old 31st August 2013, 11:37 PM   #4
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I've done a lot of in wall speakers in the past year. I like these two.

This one is very effecient but requires subs. In-wall version of Delta Max

And this one has pretty good extension and fairly effecient, but the mid tweet is NLA and I did it active. Could be done passively though. An in-wall FAST that really rocks

By the way. There's nothing wrong with in wall. It sounds amazing to me. I'm sure you'll find something that works for you.
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Old 1st September 2013, 02:08 AM   #5
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Quote:
Originally Posted by head_unit View Post
Hmmm, a horn folding on itself. Well, that would require major wall surgery, but it's certainly an idea. I'm also encouraged to see what I presume is a decent full range (Fostex FE166e) is not too expensive at $75ish.
Hi, I don't see any reason why not using the Fostex FE166En 6.5". It works fine in a BR 10L with a 2" port (12cm length). You can cross to sub 75-100Hz.
The big brother Fostex FE206En 8" might not have the clearance you need... and is more expensive.
Also nice HE drivers for 2-Ways and full-ranges at faitalpro.
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Last edited by Inductor; 1st September 2013 at 02:11 AM.
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Old 1st September 2013, 05:31 AM   #6
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This might serve some inspiration. FE206 in-Wall horn done by one of the guys on the JoeList.

http://frugal-phile.com/boxlib/j-Day...orn-070411.pdf

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Old 1st September 2013, 05:48 AM   #7
xrk971 is online now xrk971  United States
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A flat wall mounted BIB with an asymmetric bifurcated mouth.
Full Range Speaker Photo Gallery
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Old 1st September 2013, 05:55 PM   #8
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Interesting stuff! The one with the horn is too deep, but I supposed I could make the "baffle" out of 2x12" and probably get enough clearance. It would stick out from the wall, but maybe that's not bad.
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Old 1st September 2013, 09:40 PM   #9
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The more flush with the wall the better.
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Old 3rd September 2013, 04:32 PM   #10
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Whether a pair of "in-wall" enclosures that protruded out from the face of the drywall would be a huge aesthetic no-no would depend on the individual situation, but my concern would be the beaming at higher frequencies. Regardless of size, I've found any FR driver I've used so far for the L&R mains have benefited from minor degree of toe-in.

Ryan's approach in the threads referenced above are rather interesting - IINM the one with small tweeter had a small wave-guide, which with minor shimming could probably provide the focused toe-in that could help offset HF beaming.

Ryan - once completed with the fabric covers, how far did these protrude from the wall?
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