Here's what I've got:

LE-15B's in 4.5 cu ft vintage furniture cabs; sliding bottom panel cut-out (cab is on legs) for adjustable venting

2420's on Edgar round horns (800hz cross)

3131A crossovers (huge! out of 4331A monitors somebody parted out)

My main question is about proper venting for the 15B. WAF dictates that the cabs stay, but venting can be adjusted. marc g. told me the stock venting was 2 4" dia. tubes, 7.5" long. Seems like a LOT of venting for a really loose woofer. I've narrowed the gap on the sliding panel quite a bit to focus things a bit more.

Anyway, any hints would be very much appreciated. I'm driving them with PP 6B4G's, and they have GREAT potential if I can tighten up the bass a bit.

Let me number crunch and see what this looks like.

I think the above will get you a solid -3dB at 21hZ...-2 at 24 hZ and level at 28hZ.

This is strictly off the top of my head. I do prefer rear ports, 3 12th's the way from the top of the rear baffle. Space them symentrically side by side.

Now I will number crunch to see what this looks like on paper.

He will need 2" of fiberglass on all walls and the rear.
Could you run the numbers and see where it lays?

Appreciate it.

Someday when I have the time, I'll take them to a speaker shop in Chicago to get measured. But that means taking them out.... hmmmm, not so sure now....

Think they'll go that low?! I cranked up the Saint-Seans organ concerto, and it seemed to go aaaallll the way down. My amps only do 20hz, tho.

Big time. I have heard them in multiples of 3 hit 15hZ as fat as anything avalible.

My port sizes are not scientific, but artful.

You try them, you will find they will correct a lot of problems, and you will have the serious bottom provided the internal dampning material is there.

JBL LE15A

fs 20
Qts 0.21
Vas 26.0
Eff 2.6
Pe 100
Xmax 0.16
Dia 13.2
Qms 5.5
Qes 0.22
Re 8.8
Le 2.2
Bl 22.0
Mms 97
flux 0.90