FR125S for in-wall surround - diyAudio
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Old 4th January 2007, 08:28 PM   #1
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Lightbulb FR125S for in-wall surround

Hello,

I'm about to start construction of a home theater and will be building high quality Left, Right, Center, and Sub but I was thinking that In-Wall speakers for the surround would we perfect for our room. I also don't want to worry about crossovers for these speakers so after reading many of the discussions on this board it looks like the FR125S might be perfect for my needs.

I'm aware that In-Wall speakers have certain inherant limitations but for surrounds I wonder if this is a factor.

If I go ahead with idea I just need some help sizing the boxes. The maximum depth I have is about 5" (2X6 studs).

Has anyone ever done this or can anyone give me a hint on how to proceed.

Thanks a bunch,
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Old 4th January 2007, 08:34 PM   #2
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I designed an in-wall HT for a customer not too long ago using the FR125S for all the channels. He was pretty happy with it. There was an obvious compromise with the depth but in a wall there's plenty of room height-wise. For surrounds I would go with 4 litre sealed. That'll get you a pretty reasonably sized box.
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Old 4th January 2007, 09:09 PM   #3
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So, if you build a box using typical 3/4" material your driver will have about 1.25" clearance from the rear of the box. Cover that surface with something acoustically aborbsent (poly, fiberglass or Black Hole) and fill the remainder of the box with PolyFil or equivalent. External dimensions would be something like 5"D x 8"W x 9"H or whatever can fit in your space. If you can make it a little larger, perhaps up to 6 litre that would be better.
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Old 5th January 2007, 01:13 PM   #4
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Thanks guys. That's exactly what I need to get started.
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Old 10th January 2007, 02:41 AM   #5
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Default Question for Timn8ter

I was wondering how that sort of design would sound for 2 channel audio in a kitchen.

I have a set of small Mirage AVS-SAT speakers wall mounted in our kitchen and was thinkning of replacing with something that would provide a fuller sound.

I had originally intended on installing a sub with the sats but never got around to it.

Did you ever try the inwall FR125 without a sub ?

Thanks for any comment
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Old 10th January 2007, 03:06 AM   #6
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I don't know why that wouldn't work, they are pretty versatile drivers.
The "fullness" is going to depend on how large a cabinet you can put them in. Up to 9 litre sealed will work. I just built a pair in 7 litre sealed boxes that sound very nice and provide surprising bass response. I don't recommend trying to play dance music at 90db with them but at normal listening levels they do quite well.

The smaller the box the less bass response you're going to get, the higher the Q will be and you'll start developing a hump around 100Hz if it gets too small.
I suppose you could port the boxes to get more bass if you want. The standard BR design is a 7 litre box with a 1.5" x 4" port tube.
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Old 10th January 2007, 03:50 AM   #7
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Quote:
Originally posted by Timn8ter
I designed an in-wall HT for a customer not too long ago using the FR125S for all the channels. He was pretty happy with it.
Same here. I have another client who is buidling a variation of the FE127 diyRef ML-TLs into his walls for rear & side surrounds -- that system is still being built.

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Old 10th January 2007, 01:42 PM   #8
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I wonder if an in-wall/ on-wall combo might be even better. Have a look at these for an example.

http://www.axiomaudio.com/wallspeakers.html

This might help with the in-wall issues I've heard about.

Also I agree with Timn8ter about ported boxes but that would make the design more complicated.
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Old 10th January 2007, 01:42 PM   #9
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Another thing to consider is that an on-wall speaker design would be easy to mount to the 2x4s if the face of the speaker extended over the studs.

Hey here's another question. Should the speaker boxes be screwed to the studs and form solid connection or should they be isolated in some way with a rubber gasket?
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Old 10th January 2007, 02:09 PM   #10
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I like stiff enclosures so I'd afix them to the studs.

That design is an excellent way to get around the depth issue which is a definite compromise.

If you're willing to sacrifice ~10Hz - 15Hz in bass response the sealed boxes sound much nicer.
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