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Multi-Way Conventional loudspeakers with crossovers

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Old 9th January 2012, 11:59 PM   #381
Salas is offline Salas  Greece
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Going to bed, good night Salas.
Sesame Street - Ernie and Bert - Ernie counts sheep - YouTube

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Old 10th January 2012, 09:54 AM   #382
Starre is offline Starre  Sweden
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Hehe
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Old 10th January 2012, 12:23 PM   #383
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Starre:
Nice!
It's fun to build your own things!

Salas:
If I simulate your filter I see a drop in the frequency curve between 1kHz-3.5kHz on- and off-axis. And then a little bump from 3.5-5kHz i think it was.
I would understand if you lowered the tweeter from ~1-2kHz upp to 20kHz by ~2dB, but this i do not understand.

What was/is your decision to this drop?
You can see some of what i have tried to explain in your posted FR in the 2-way thread
Click the image to open in full size.
I'm constructing a loudspeaker (4 actually, tm, tmm, mtmm, mmtmm) with the exact same config, so it would be fun and interesting to hear your thoughts around yor decisions.
Everything else is different about our two speakers except the 2.4mH coil
Here is a pic of an inroom response of an early active crossover version, and I have since this raised the tuning a bit fixed some other things, like the slope at 2kHz.
Click the image to open in full size.
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Old 10th January 2012, 12:48 PM   #384
Salas is offline Salas  Greece
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That green curve is two speakers playing pink noise in room, taken at 2.5m distance at the center. So the mic was off axis to both. Thus its not easy to repeat for a mono speaker on axis with data taken in an other situation like yours. As for why I did it the way I did, is it was flat initially through the mids but when both were playing I judged it a bit forward for piano and vox.
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Old 10th January 2012, 01:17 PM   #385
Starre is offline Starre  Sweden
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Thanks Schmutziger, the drivers are very good and I hope you get it just right for your taste .
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Old 10th January 2012, 01:24 PM   #386
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My pic is also two speakers but ~3m away measurerd in center of both speakers.
Probably with the speakers crossingpoint ~0.3-.5m in front of the mic. so "off-axis" for me to.
but measured with a sweep not noise.

ok, we have solved that in different ways then.
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Old 10th January 2012, 01:28 PM   #387
Salas is offline Salas  Greece
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Very little toe in for the speakers when I got the green curve. But if you get flat mids with 8 inch drivers when the mic is off axis, aren't they boosted for level there a bit when the mic is on axis to each one individually? What happens if you measure the pair when each one is looking almost straight ahead to the room?
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Old 10th January 2012, 02:01 PM   #388
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Originally Posted by Starre View Post
Thanks Schmutziger, the drivers are very good and I hope you get it just right for your taste .
Thanks!
I'm getting there!
"some" cross-over work to do though...


Salas:
At current they measure very straight on axis and quite straight off-axis.
experimenting with waveguide in order to reduce tweeter power off-axis
Going to do a lot of measuring in a couple of days(hopefully) could post some pics when it's done, and if it looks and sounds good

Last edited by schmutziger; 10th January 2012 at 02:09 PM.
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Old 10th January 2012, 02:48 PM   #389
Starre is offline Starre  Sweden
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I use my speakers with rather much toe-in since I want to reduce first reflex from side walls. I also think the overall balance is good like that, not too forward at all from my build.
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Old 10th January 2012, 02:59 PM   #390
Salas is offline Salas  Greece
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The mids response are very much dependent on the individual box dimensions and shape also. Schmutziger, are your boxes analogous? Got early pictures?
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