Newbie Discussion - 12cxn88 design in WinISD

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12cxn88 design in WinISD

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Category: General
Forum Name: Newbie Discussion
Forum Description: Newbie Discussion/Questions. Look less stupid here...
URL: https://forum.speakerplans.com/forum_posts.asp?TID=103116
Printed Date: 27 March 2026 at 4:12am
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Topic: 12cxn88 design in WinISD

Posted By: osse
Subject: 12cxn88 design in WinISD
Date 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" rel="nofollow - 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.

Replies:

Posted By: Pasi
Date 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.

Posted By: Zead
Date Posted: 24 August 2025 at 2:12pm

Hi, wanna do similar design. Mind sharing volume and port size you settled on?

Posted By: Larry23
Date Posted: 24 August 2025 at 3:26pm

Not sure if this is helpful - the box I modelled for that driver is 40.1l, tuning 55.7hz. F3 is ~53hz. Port velocity ~22 m/s with port area 75mm x 100mm, length 279mm. Seems to give a relatively flat/extended alignment, with good control over cone excursion, and sacrifices as little as pos efficiency wise.

I use the 12NDL88's in similar cabs, slightly different alignment, and they work very well.