H frame or U frame subs for Lxmini

[pjblakey]

Hello all....
I am thinking of repurposing some vintage speaker cabinets that measure 25”h x 16”w x 12”d to make a couple of subs to go with my LXminis.
I already have 4 GRS 10” subwoofer drivers that perform pretty well in a W frame configuration which is the sub section of 3 way open baffle speakers I built some time ago.
I’ve already cut out the baffle of the vintage cabinets. Are the dimensions of the cabinet suitable for a U frame or H frame set up using the 4 GRS drivers?
Thanks
Stay safe
Peter

 

[Booger weldz]

Kindof a dumb question probably, but what is referred to exactly when they use H or U to describe the baffle? I jumped into this speaker stuff from a tangent of sorts and kinda missed a few parts in the leap.😀

 

[David McBean]

See attachments - red is driver, black is baffle.

The first system looks like the letter H rotated through 90 degrees, and the second looks like the letter U, also similarly rotated.

 

[scottjoplin]

All you have to watch is cavity resonance, so for subs U-frame should be fine.

 

[Booger weldz]

See attachments - red is driver, black is baffle.

The first system looks like the letter H rotated through 90 degrees, and the second looks like the letter U, also similarly rotated.

Thanks! It makes perfect sense now .

 

[TBTL]

H frames have the resonance occur at a higher frequency, which is good.
H frames have symmetrical front and rear output, which is good if a dipole dispersion pattern is what you are after.

When the cavity is damped, U frames have up to 6 dB more sensitivity and the dispersion pattern is somewhat cardioid.

An undamped U frame is cardioid nor dipole. I guess it is closest to dipole.

 

[David McBean]

H frames have symmetrical front and rear output, which is good if a dipole dispersion pattern is what you are after.

As shown in Attachment 1.

When the cavity is damped, U frames have up to 6 dB more sensitivity and the dispersion pattern is somewhat cardioid.

As shown in Attachment 2.

An undamped U frame is cardioid nor dipole. I guess it is closest to dipole.

As shown in Attachment 3.