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Ambience tweeters using small BMR drivers
Ambience tweeters using small BMR drivers
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Old 15th August 2018, 08:11 PM   #21
bwaslo is offline bwaslo  United States
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Ambience tweeters using small BMR drivers
Weird psychoacoustic effect noticed - the bass sounds deeper and smoother with the ambience tweeters playing than without. But they don't do anything below about 2kHz. I've heard a subwoofer cause treble to sound better, but not the other way before.

BTW, I didn't play with FIR phase-scrambling the ambient treble, mostly because it would be more work and I want to listen some more. The log-IR plot appears to indicate the the added treble is pretty diffuse anyway (since it comes from multiple drivers playing off ceiling and side walls). Maybe later I'll give the FIR a try.
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Old 15th August 2018, 08:28 PM   #22
Pano is offline Pano  United States
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Ambience tweeters using small BMR drivers
Thanks for the update and measurements, Bill.

"Like driving a brick." Yeah, that's what I found too. But I think you've found the perfect use for them.
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Old 15th August 2018, 08:50 PM   #23
DMLBES is offline DMLBES
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Quote:
Originally Posted by bwaslo View Post
Weird psychoacoustic effect noticed - the bass sounds deeper and smoother with the ambience tweeters playing than without. But they don't do anything below about 2kHz. I've heard a subwoofer cause treble to sound better, but not the other way before.

BTW, I didn't play with FIR phase-scrambling the ambient treble, mostly because it would be more work and I want to listen some more. The log-IR plot appears to indicate the the added treble is pretty diffuse anyway (since it comes from multiple drivers playing off ceiling and side walls). Maybe later I'll give the FIR a try.
I have experienced the treble to change the sound of my speakers when experimenting with my DML panels especially in the bass/low frequency region...I make my own tweeters using a 13mm exciter and a small super thin piece of 99.9% pure titanium foil.


Although humans cant hear past 20khz, I believe a tweeter designed to reach 20khz-100khz can change the sound of a system due to its ambience.
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Old 17th August 2018, 12:34 AM   #24
bwaslo is offline bwaslo  United States
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Ambience tweeters using small BMR drivers
I think maybe it's that the more lively treble gives the bass something to contrast against (in hearing of course). Or maybe the in-the-room illusion just seems to encompass the bass too.

But this isn't an effect I've ever noticed before. Of course most changes of HF I've listened to (that could be checked in a timely with/wtihout manner) in the past was only for crossover or EQ. Maybe different treble radiation patterns or room delayed-energy levels normally affect perception of the rest of the audible range, but it's just not so easily experienced and rechecked.
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Old 17th August 2018, 08:36 AM   #25
Juhazi is offline Juhazi  Finland
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Bill, can you show us room decay measurement with and without the ambience tweeters?

When I added rearside tweeters and finally dipole tweeters to AINOs, decay changed noticably like the sound. But I didn't notice difference in bass range. Harmonics of bass don't reach above 2kHz either, except some transient components of a drum or eg. slapped bass.
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Old 17th August 2018, 03:21 PM   #26
Brinkman is offline Brinkman  United States
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Bill, as far as audibility is concerned, how do the ambience tweeters stack up against the diffusors you're also using?

a few years back, inspired by Duke's LCS modules, I built up a pair of the DIYSG Volt-10 coaxial speakers in the angled sealed cabinet (f3 circa 70Hz). They were intended to be placed on the floor, aimed up and angled toward the side walls. Unfortunately, too many "moving parts" in my setup has prevented me from integrating them in that role. I did, however, use them briefly as mains and was struck by the coherent quality of the sound, which is what steered me towards your more recent builds.

Your project looks great BTW.
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Old 17th August 2018, 05:29 PM   #27
bwaslo is offline bwaslo  United States
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Ambience tweeters using small BMR drivers
Hi Juahzi,

Next time I get the mic out I'll do some ETC and RT60 plots. But you can get a fair idea of the broadband decay from the Log Impulse Response plots -- the decay rate seems to be about the same with or without, but the density looks higher with the ambients in. I think the bass thing has gotta be some psychoacoustic effect, nothing having to do with the actual bass. It might be accentuated by the fact that the bass in the setup is somewhat limited -- each channel just has two 6" sealed woofers, Linkwitz-Transformed to get down into the 50Hz range. I don't really notice the limitation much when the ambients are playing with.

Hi Brinkman,

The effect of the ambient channels have some similarity with the diffusors, actually, the effect on how large the room sounds mostly. But the ambient channels can be made to be stronger, there's a limit to how much the diffusors can can catch and send back, at least without making all the room surfaces diffusors!

I do wish the ambients were getting more energy to me from the sides/back though. But I don't think it would be so easy to keep ambient speakers near the back of this small room unlocatable. Plus it would be a pain to run wiring to any here. The back walls in this old place are actual plaster instead of drywall.

Bill
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Old 17th August 2018, 09:18 PM   #28
Brinkman is offline Brinkman  United States
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I was going to ask why you designed these with an emphasis was on the >2kHz region but found my answers earlier in the thread. Still interesting regarding the perceived deepening and smoothing of the bass. Do you think that the boosting of correlated bass overtones in the >2kHz region may be enhancing your perception of the (out-of-band) fundamental?

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Hi Brinkman,
The effect of the ambient channels have some similarity with the diffusors, actually, the effect on how large the room sounds mostly. But the ambient channels can be made to be stronger, there's a limit to how much the diffusors can can catch and send back, at least without making all the room surfaces diffusors!
Re-reading the thread just now, I forgot that the diffusors are in your basement setup and the ambient channels are for the upstairs. Please let us know your impressions of the diffusors and ambient channels in tandem if you decide to bring your new toys downstairs. It would interesting to know if they play well together or if it is more of an either/or proposition.
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Old 17th August 2018, 10:35 PM   #29
bwaslo is offline bwaslo  United States
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Ambience tweeters using small BMR drivers
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Do you think that the boosting of correlated bass overtones in the >2kHz region may be enhancing your perception of the (out-of-band) fundamental?
Could be, I guess. I wouldn't think there'd be too many bass overtones up at 2kHz, though? But I have read that bass is perceived much by spacing between overtones rather than just fundamental energy. If there are enough overtones up at 2kHz, I guess the spacing of them at their fundamental would still apply.

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It would interesting to know if they play well together or if it is more of an either/or proposition.
I'm guessing that these particularly ones might be more either/or. The diffusors have the directional waveguides fired largely right at them, so they get a lot of energy to work with. The array of the small BMRs fire off omni in every direction above and to their sides, not as much would get to the diffusors. Though I am considering making another array (or maybe using the 3" BMR version) and ceiling mounting them downstairs closer and directed into the diffusors to ping them harder!

Odd stuff, mixing point source directional waveguides and wide coverage (but delayed) ambient channels, but it does seem to work. I'm hardly the first to have done this, but hadn't experienced it myself before. The diffusors are kinda the same thing, though, and those really do it for me. Relearning what others already knew, I guess.
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Old 20th August 2018, 04:26 PM   #30
wesayso is offline wesayso  Netherlands
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Interesting results so far. Makes me wonder if I could benefit from ambience drivers in the top part of the frequency spectrum, coming from the front.
The experiments (and getting different results from it) that could be done with these ambience speakers are almost endless, at least that was my experience.
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