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about 40 years ago I had Cerwin-Vega S1 with 12"/6.5" and"dhorm" of 6.5" diameter. - Active 6th order alignment, gas bag enormous fun with a DH200. If things were more favorable these days, I'd do a clone with cheap but cheerful Dayton PA310, Lavoce 97dB 6.5 and try to find a 6 inch round waveguide and run that with a small CD. PA310 would be happy in as little as 34 liter and the narrow band of boost not taxing on its 5mm excursion even at high levels. With a decent crossover this would probably sound better than the S1 for a driver cost per side of less than $200. An old EV Interface RQ box could to the filter/boost.
Cerwin Vega S1 | Audiokarma Home Audio Stereo Discussion Forums
pa310 Sim
https://i.imgur.com/0eG9UxB.jpg
Cerwin Vega S1 | Audiokarma Home Audio Stereo Discussion Forums
pa310 Sim
https://i.imgur.com/0eG9UxB.jpg
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Looks like (170*-70*)/(6100*360) = 1 / 21960 = 45us. The freq whose period is 45us is 22kHz. Is that worth correcting?
The distance I think is 0.07ms*1ft/ms = 0.84", meaning the treble diaphragm is not right behind the mid, but a little away.
Am I correct people?
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Not sure I understand the maths !
Should we not look at the impulses of the picture 2 ? Around 0.5 ms between the top of the two first impulse. I'm not understanding a lot of thing when it comes to phase, etc, but it seems quite good ! I don't know how I would deal with this in a passive filter by playing with the phase or a little pass band to delay the treble (easier with active dsp set ups)... But sure quite good, nothing to see with a Klipsch coax !
Should we not look at the impulses of the picture 2 ? Around 0.5 ms between the top of the two first impulse. I'm not understanding a lot of thing when it comes to phase, etc, but it seems quite good ! I don't know how I would deal with this in a passive filter by playing with the phase or a little pass band to delay the treble (easier with active dsp set ups)... But sure quite good, nothing to see with a Klipsch coax !
Isn't that 0.05ms? I couldn't make out exactly how much that was. So I used the phase from the first graph to get to 45us (0.045ms) at the crossover of 6.1k, which is close enough to your 0.05ms. However, the impulse responses showed around 0.07ms (70us) which I used in my second calculation for the physical offset between the mid and treble portions.
In the passive world, a delay is obtained by way of an all-pass filter.
In the passive world, a delay is obtained by way of an all-pass filter.
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This should provide the offset for a focal-like design and allow for smaller diameter mid.s for integration at a lower crossover freq. (..around 2 kHz):
Dome tweeter SB Acoustics SB26STWGC-4, impedance 4 ohm, voice coil 26 mm
..and perhaps a "focus'ed" MTM (2x parallel connected) with these:
Boutique Haut-parleurs & Audio DIY
see measurements here:
Timothy Feleppa's Pages: Speaker Measurements - Woofers 5" to 8"