Isn’t the in-wall speaker an “infinite baffle” kind of device?
I don’t know much about this.
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In-wall Speaker Measurements (Monoprice THX-365IW)
- Thread starter amirm
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Isn’t the in-wall speaker an “infinite baffle” kind of device?
I don’t know much about this.
No, they (in-wall and those particular on-wall speakers) are significantly different. Do your regular speakers have padding/dampening on the front surface (baffle)? Nope, except possibly a ring around the tweeter, which in-wall can have as well. You're confusing a delayed reflection off an adjacent (and angled) surface with a baffle. https://en.wikipedia.org/wiki/Loudspeaker_enclosure#Infinite_baffle
I might be wrong, but in ordinary speakers the enclosure is relatively small compared with the wall.
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I'm referring to in-wall speakers, as in, the baffle is the wall.
dasdoing
Major Contributor
I am a little confused.
imo the material of the wall will have a huge impact:
1) if it is a "european wall" there will be very few "leakage" from behind the speaker
2) a drywall will let a lot of frequencies threw...espacialy the ones that are omidirectional and will bounce around behind it.
imo the material of the wall will have a huge impact:
1) if it is a "european wall" there will be very few "leakage" from behind the speaker
2) a drywall will let a lot of frequencies threw...espacialy the ones that are omidirectional and will bounce around behind it.
Well, you might be correct. I have nothing further to add.
I think I read somewhere that this “elephants ear” takes care of early reflections of the back wall that otherwise causes distortion.
Not sure if this is relevant with infinite baffle / in wall designs.
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OP
- Thread Starter
- #88
I can source a lot of them at dealer cost because this is a category of products for which Madrona is a dealer (we do custom installs of electronics).
OP
- Thread Starter
- #89
I can't imagine actually using the Klippel version.
As you see, you can't stick a tall in-wall speaker in there anyway. It is made to have that replaceable insert where the driver is (in yellow).
The main thing it does is solving the alignment issue. Otherwise, it is not designed for what we want to do even though it is advertised (partially) to do so.
the sound pressure moves away from the wall/baffle, no frequency is omni-directional in this case and no frequency will go through the baffle before reflecting off some other boundary first.
the horizontal directivity graph is +/- 90 degrees, not the typical +/- 180.
@amirm is it possible that the directivity graphs are adjusted back to the typical +/-180 so people would stop thinking this is an omni-directional speaker by mistake?
OP
- Thread Starter
- #91
The software is forcing the truncation to 90 degrees as it knows it didn't measure more than that. I did not do anything specific to get those plots.
I actually think the original review where I did not do that was more confusing as one wonders how the sound is wrapping past the wall in an in-wall speaker.
OP
- Thread Starter
- #92
Those were in the original review: https://www.audiosciencereview.com/...price-thx-365iw-review-in-wall-speaker.24500/
Nothing has changed in that regard so I did not repeat them all. Here they are again:
dasdoing
Major Contributor
ok, but what about the negative soundwave generated behind the driver? isn't that the reason there needs to be a wall in the first place?
Linkwitz wrote about Doppler shifts causing distortion when the (in-wall) speaker resonates with the wall.
http://www.linkwitzlab.com/Links/Baffle Vibrations in Open Baffle Dipole Loudspeakers Kopie.pdf
Adding a beefy piece of iron behind the speaker surely would decrease the movement as per Newtons third law.
you're confusing open baffle (dipoles) with infinite baffles. in infinite the 'negative' sound pressure will just go forward, the same way the 'positive' sound pressure goes forward.
the depiction in the picture never happens, the pressure just propagates forward.
dasdoing
Major Contributor
you're confusing open baffle (dipoles) with infinite baffles. in infinite the 'negative' sound pressure will just go forward, the same way the 'positive' sound pressure goes forward.
the depiction in the picture never happens, the pressure just propagates forward.
well...I see I have to study a little to understand this lol
thanks
Since it’s a hemispherical measurement, I guess all rearward data is false and just for being able to do the Spinorama.
Here’s my horizontal heatmap:
ROOSKIE
Major Contributor
Howdy, not sure that I was having trouble understanding SBIR.
The Allison effect is sort of the old term for some of the aspects of what makes up SBIR, is it not?
I deffinetly take these cancelations into account (with measurements) as I place and move speakers. Can really only do so much though.
This doesn’t reflect an infinite baffle though as there shouldn’t be any data points from behind (otherwise the baffle will be finite and more like an open baffle).
I wasn’t really requesting data (that doesn’t exist) but just asked for the scale to be identical ( with the second hemisphere being blank) so people are aware that this speaker would not be omni-directional at any frequency.
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I always gain new insights into things I have never considered by reading Amir's reviews.
I was always under the audiophile myth that there was no substitute for big box speakers for usual multi-use residential AV rooms. Even when listening at "residential" levels - not being obnoxious to neighbours or others in the house. In wall and on wall were supposedly acoustic flops, an unnecessary compromise if you habe space for big speakerd. Hence in my own, I have huge LCR, subs, rears etc.
If I could de-clutter the "lounge" room with in- wall speakers without a significant compromise in sound quality that would be a massive win.
Amir's testing ( and @Bear123 ) shows this is possible, and the cost is mind boggingly reasonable! I never realised there were so many in-wall options that can fit all types of wall cavities.
I was always under the audiophile myth that there was no substitute for big box speakers for usual multi-use residential AV rooms. Even when listening at "residential" levels - not being obnoxious to neighbours or others in the house. In wall and on wall were supposedly acoustic flops, an unnecessary compromise if you habe space for big speakerd. Hence in my own, I have huge LCR, subs, rears etc.
If I could de-clutter the "lounge" room with in- wall speakers without a significant compromise in sound quality that would be a massive win.
Amir's testing ( and @Bear123 ) shows this is possible, and the cost is mind boggingly reasonable! I never realised there were so many in-wall options that can fit all types of wall cavities.
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