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Recommend driver for 1.16 ft^3 box
Recommend driver for 1.16 ft^3 box
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Old 4th December 2017, 03:41 AM   #21
planet10 is offline planet10  Canada
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Recommend driver for 1.16 ft^3 box
Good idea. Would allow for single driver. Gonna be heavy with all that sand in the void

dave
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Old 4th December 2017, 04:49 AM   #22
zman01 is offline zman01  Bangladesh
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Recommend driver for 1.16 ft^3 box
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Originally Posted by planet10 View Post
Good idea. Would allow for single driver. Gonna be heavy with all that sand in the void

dave
Nonetheless it would be interesting to hear from the MLTL/TL experts about their take on this. ☺️
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Old 4th December 2017, 04:51 AM   #23
planet10 is offline planet10  Canada
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Recommend driver for 1.16 ft^3 box
I’ve wanted to build a Twin A10PeN speaker for sometime…

dave
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Old 4th December 2017, 07:01 AM   #24
Doppler9000 is offline Doppler9000  Canada
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Quote:
Originally Posted by planet10 View Post
2 FF165wks might be made to work — the volume works, F10 in the mid-high 40s, 95 dB efficient, 98 dB senstive (4Ω…
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Originally Posted by planet10 View Post
Also, reports of efficiency seem to indicate that the spl is optimistic, like the Visaton B200 picked off the graph somewhere up were the FR has risen significantly…
Assuming the Fostex is the FF165WK, the spec is way off – I calculate 91.5 dB/W(1m). The factory spec I see is 92, which is what 91.5 would round to.

I calculate the Dayton at 95.4 (1.1 dB below spec). The spec on the Alpair A10P is spot on.

Comparing the driver specifications will tell you that the Dayton is much more efficient than the Fostex. Fs and Qes figures are pretty close but the VAS on the Dayton is over 3x the Fostex number. Hoffman’s law will tell you the Dayton is going to be more efficient.

With a spread of about 4 dB, to reach the same SPL out of the Dayton at 4 watts would require 10 watts with the Fostex.

Last edited by Doppler9000; 4th December 2017 at 07:04 AM.
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Old 4th December 2017, 07:45 AM   #25
planet10 is offline planet10  Canada
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Recommend driver for 1.16 ft^3 box
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Originally Posted by Doppler9000 View Post
Assuming the Fostex is the FF165WK, the spec is way off I calculate 91.5 dB/W(1m).
Measured is a bit over 91.

Quote:
I calculate the Dayton at 95.4 (1.1 dB below spec).
My comment was based on others experiences. Bass shy, treble hot, less db once flattened out.

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The spec on the Alpair A10P is spot on.
Measured at almost spot-on to 90 dB.

Quote:
the VAS on the Dayton is over 3x the Fostex number.
Yep. With the same miniOnken style alignment Dayton needs 60 litre, Fostex 17.

F10 ~ low 40s, high 40s, low 40s Dayton, Fostex, Mark Audio.

The OP has ~38 litres which will fit 2 of the Fostex of Mark Audio and is too small for the Dayton.

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Old 4th December 2017, 01:22 PM   #26
vdi_nenna is offline vdi_nenna  United States
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How close are the matching on the Alpair drivers?
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Old 4th December 2017, 08:01 PM   #27
planet10 is offline planet10  Canada
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Recommend driver for 1.16 ft^3 box
Of the drivers i have tested (samples of at least 4, but often as many as 20), the Alpairs have the closest bunching. Typically less than 10% using my metric of T/S differences. Sensitivity differences of less than 1 dB. Sometimes i can completely match up pairs (differences of 3%, sensitivity within 0.25 dB), sometimes not — i ended up with 4 singles in the last batch of 20 Alpair 7.3. Fostex are sometimes up around 18%. TBs even greater (althou many less samples). Peerless not as good as the Mark Audio. A “pair” of Audio Nirvana so different as to be different drivers.

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Old 5th December 2017, 12:24 PM   #28
vdi_nenna is offline vdi_nenna  United States
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Would a pair be wired push-pull (front and back), in phase (front and back) or same polarity on front baffle? I'm trying to visualize the effects of each. Di-pole could have some cancellation. Bi-pole would reinforce, but the whole thing seems like a special effect to me. I mean I've tried open-baffles and they are as good as they are bad.
Dual drivers on the front blurs the point-source, doesn't it?
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Old 5th December 2017, 12:31 PM   #29
IG81 is offline IG81  Canada
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You want the drivers to work in phase ("push in" the enclosure together) or you essentially nullify the Vb.

Dual drivers will still be point source for significantly larger wavelengths, but it pushes down the frequency at which they won't be anymore and you'll start to have more lobing.
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Old 5th December 2017, 01:03 PM   #30
vdi_nenna is offline vdi_nenna  United States
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Bi-polar would be more likely to work out.

I'm interested in the Alpairs. I like the purity of the paper cones.
What do you guys think about back waves traveling back through the driver?
Has to happen with all drivers, but is it worse with paper cones?
If in a bi-pole config, this has to be more of a concern, correct?
Is this why I sometimes see a perforated partition between opposing drivers?
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