MT122 - P.audio BM-12W drivers

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P.audio BM-12W drivers

Printed From: Speakerplans.com
Category: Plans
Forum Name: MT122
Forum Description: Discussion / Questions about the MT122
URL: https://forum.speakerplans.com/forum_posts.asp?TID=2181
Printed Date: 27 March 2026 at 12:39am
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com

Topic: P.audio BM-12W drivers

Posted By: Toddy
Subject: P.audio BM-12W drivers
Date Posted: 07 July 2005 at 5:42am

Can I use P.audio BM-12W drivers in the MT122? The reason why I`m asking is because I have them in home made boxes, and I`m not happy with the sound. I use the P.audio PA-D72 with the PH-4528 horn, and two BM-12W pr. side.

Toddy

Replies:

Posted By: whitehousejamie
Date Posted: 07 July 2005 at 5:46am

Unfortunately, they will not work very well in the MT122. The Qts of the driver is too high, and you need a driver with simular parameters to the SN-12B for use in a mid horn such as the MT122.

Posted By: Toddy
Date Posted: 07 July 2005 at 6:09am

will the fq-response be wrong?

Posted By: Toddy
Date Posted: 07 July 2005 at 6:25am

can someone here design a horn for mid to the BM-12W?

Posted By: Jimbo
Date Posted: 07 July 2005 at 8:36am

Got TS?

Posted By: Toddy
Date Posted: 07 July 2005 at 8:42am

Resonance Frequency Fs     38.0 Hz
DC Resistance Re     6.8 Ohm
Mechanical Q Factor Qms     2.533   &nbs p;
Electrical Q Factor Qes     0.386   &nbs p;
Total Q Factor Qts     0.335   &nbs p;
BL Factor BL     17.33 T x m
Effective Moving Mass Mms     71.44 gr
Equivalent Cas air Load Vas     90.27 liters
Effective piston area Sd     0.0510 m2
Voice-coil inductance @ 1 KHz Le1k     0.92 mH
Half-space efficiency Eff     1.24 %
Airgap Height Haq     8.0 mm
Voice coil Height Hvc     17.0 mm
Voice coil Over-Hung Xmax     4.5 mm

Posted By: DJ Tosco
Date Posted: 07 July 2005 at 11:15am

This isn't a good horn driver. This results in a narrow bandwidth and poor mid high extension when horn-loaded. The Fs is too low, Qes too high, and Bl^2/Re isn't very high.