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Multi-Way Conventional loudspeakers with crossovers

TB new line of Coax FR drivers
TB new line of Coax FR drivers
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Old 11th November 2019, 11:53 PM   #301
angrypat is offline angrypat  United States
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TB new line of Coax FR drivers
What are you juicing the SB12.3 's with? I've thought about those, bang for the buck, big woofers, but I don't know if my F6 would drive them well enough. They look great in that red!
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Old 12th November 2019, 02:33 AM   #302
Crossrh is offline Crossrh  United States
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Thanks, Pat. I'm running the SB12.3s with a Denon AVR-X4000 pre-outs to a Monoprice Monolith 7 x 200. I don't think I'm getting all 200 watts out of the Monolith as the pre-out voltage is lower than the input sensitivity of the amp. The Monolith HTP-1 16 channel pre-pro is due out on Friday, and I plan to pick one up. My Denon is six years old, so it's about time.

I painted the SB12.3s with General Finishes' "Holiday Red" Milk Paint. It's water-based, so I primed the MDF with Zinzer's oil-based primer.
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Old 12th November 2019, 03:36 AM   #303
Crossrh is offline Crossrh  United States
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New crossover: (I could smell the frustration in your voices)
2740 Hz 1st order crossover: 14uF / .25mH
3dB L-Pad 1.2 / 10 ohm
47mF / 4.7ohm Zobel

This graph is merged near and far field, with a Baffle correction. 1 meter. And, yes, I'll pad down the tweeter some more. Xsim said 3dB would be enough.

I'm curious if the inbound replacement driver will have the same HF rollercoaster that this one has.

Rick
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Old 15th November 2019, 03:20 AM   #304
Crossrh is offline Crossrh  United States
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I've had these breaking in now for about 15-20 hours, at reasonably high levels, and now they sound amazing. I have never heard imaging like this. Yes, the base is light, but more acceptable than I expected.

I'm probably happier with these than any other comparable-sized speaker I've made to date. I'm tempted to try them in a ported enclosure.

Rick
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Old 15th November 2019, 04:45 AM   #305
perceval is offline perceval  Taiwan
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The lack of bass mostly comes from the tweeter being too hot still.

Of course, ported will also give you some extension down low, but it will still be too low level compared to the tweeter and will not really show.

You also might consider adding a sealed woofer base to them, so that you can keep the punchiness that sealed designs have over ported ones.
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Old 15th November 2019, 05:00 AM   #306
perceval is offline perceval  Taiwan
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Your XO compared to mine (in grey).
I got a room node at 200Hz to fill in a little, and with listening to them a bit off axis, I have a nice gradual downslope.

In case you are wondering, my XO is from post 189
TB new line of Coax FR drivers



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Old 15th November 2019, 06:11 AM   #307
murat is offline murat  United States
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perceval, how is your long term satisfaction with the driver + crossover now? How would you evaluate the overall coherence to a full-range, in particular?
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Old 15th November 2019, 09:02 AM   #308
00940 is offline 00940  Belgium
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Quote:
Originally Posted by Crossrh View Post
I'm curious if the inbound replacement driver will have the same HF rollercoaster that this one has.
Your measurements match roughly mine, so yeah, probably. See here: Speakers for a computer desk against a wall ?
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Old 15th November 2019, 12:13 PM   #309
Juhazi is offline Juhazi  Finland
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All coacial tweeters have troubles abovve 6-8kHz. KEF tangerine phase shield is the only really working remedy for that , that I know of.
www.audioexcite.com >> KEF SP1632

I have used and measured several SEAS coaxials, and learned to not worry too much about wiggles! They smooth out off-axis and are not detected by ear. Avoiding comb filtering around xo is much more important.
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Old 15th November 2019, 01:35 PM   #310
greybigtop is offline greybigtop
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I just recieved mine a few days ago. here's my observations sofar.


As expected zero bass and what there is comes out distorted even at low levels.. 150 Hz 24 b/oct. active crossover makes miracles. Tweeter sound surprisingly good provided one aplies a higher order cross over frequency, so no 1. order ********, sounds absolutely horrible and strained. With the fully active setup 150 hz and 2500 hz LR 4 th. order and we are talking absolutely high end reproduction. The unevenness on axis i the last octave is not audible, but the advantage of having a point source is. Dispersion is better than expected.
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