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12cxn88 design in WinISD

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osse View Drop Down
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    Posted: 09 January 2019 at 10:54pm
Hello guys! I'm trying to simulate a BR enclosure with this driver in WinISD, focusing only on the 12" parameters. I have 2 questions:

I've found a compromise of cutoff frequency, port size, enclosure size and port velocity that I like. The thing is that when I apply maximum voltage the driver can take, I'm only utilizing 50% of the Xmax of the driver, is this an indication of a sub-optimal alignment?

The box tuning freq is at 80% higher than the driver FS.

The simulated response has a 4 dB bump near tuning freq that falls off slowly within 2 octaves upwards. Is this too much of a resonance to sound good?

https://www.audioxpress.com/article/test-bench-b-c-speakers-pro-sound-12cxn88-12-coax-driver according to this website the physical xmax of the driver is 5,25 mm, which is much closer to the number I'm getting at full power in WinISD, is this number more accurate/important than whats specified by B&C?

Thanks for any advice.

Edited by osse - 09 January 2019 at 11:18pm
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Pasi View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Pasi Quote  Post ReplyReply Direct Link To This Post Posted: 10 January 2019 at 8:55am
With a low Qts driver like that, the resonance bump at tuning is indicating too big box and it won't sound good with 4dB peak.

But when you reduce the box volume, your port gets longer...

High tuning not only sounds bad plus it explains your reduced Xmax figures.

Of course you can go ahead and build one & listen, but i wouldn't personally bother.
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