Twin Alpair 7's studio monitor build. - Page 4 - diyAudio
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Old 1st March 2014, 03:51 AM   #31
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F = 1/(2*pi*R*C)

Some iteration has impedance at 6.5 ohmm F = ~350 Hz.

dave
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Old 1st March 2014, 09:09 AM   #32
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Quote:
Originally Posted by planet10 View Post
Some iteration has impedance at 6.5 ohmm F = ~350 Hz.
Spot on.
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Old 1st March 2014, 09:46 AM   #33
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Originally Posted by xrk971 View Post
When I modeled the dual A7.3 in a sealed cabinet wired in series with a 70uF cap across the lower driver, I get a response that falls off starting at 2 kHz.
Given the wiring of the drivers, FR should be the same as a single driver (voltage amp assummed) If not something is wrong with the sim.

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Old 2nd March 2014, 01:00 PM   #34
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Hi Scott
Robert and I have built a duel chamber test box or double bass reflex as he calls it to do some testing for a single A10 . I was wondering your thoughts on how this might perform compared to the double A7 . For now our test box is only ported in the secondary chamber and we haven’t cut out or installed any drivers yet.
Thanks Paul
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Old 24th March 2014, 02:52 PM   #35
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Originally Posted by lorienblack View Post
..........I have requested that the tech man does some measurements for me, so I hope to be able to post some results soonish.........
......canceled ?
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Old 24th March 2014, 04:11 PM   #36
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We are back to the drawing board actually. The HF gain of the A7's in this design make the monitor a rather unpredictable performer. With the right material it heavenly, mainly acoustic and voices, but step too far outside and it can become uncomfortably bright.

Phase 2 will employ a design more akin to a FAST build. I have an inkling we will wait to see what new drivers emerge from the MA camp.
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Old 24th March 2014, 04:34 PM   #37
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Okay without some more active devices the box and drivers didn't make the monitor job alone. Thanks lorienblack for quick answer.
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