Cleaning Altec H.F. Compression Driver Diaphram/Voicecoil

**CWJ** · August 2nd, 2020, 12:36 AM

Would 1/4" plywood work as well or would the 1/2" that you mentioned be better, maybe help with overall damping? Even thou they have extra bracing inside you can tap on the side and the sound resonates a lot. I have read different views on damping the 825, some say leave it alone, others say eliminate all resonance. Guess I will have to experiment once I get them up and runnin..

P.S. In order to be able to bring them in the house I Will have to mount the 811B/806A inside (which is where it was originally) Guess i wont be able to fine tune the cabinet for better bass response since the horn will be in the way of any porting.
here is a pic of the mounting bracket.

GM · August 2nd, 2020, 04:07 AM

As stiff as BB ply is, the original in pristine shape is cheap crate making grade at best if made after the mid-60s, hence the 1/2" and personally would use 3/4" since these cabs need a lot of bracing and mass as partly proven by Jeff Medwin/'low ohms':

Adding MASS to an A-7 825 enclosure

Mass Loading ALTEC A7 VOTT 825 enclosures - drlowmu - High Efficiency Speaker Asylum

High Efficiency Speaker Asylum

Another adding mass related thread:

Mass Loading A7s, VERY inexpensive, reversible, needed -

Re leaving stock, this is fine for prosound, but in a typical HIFI/HT app where the listening distance is only fractionally as long plus in a resonant, acoustically small room?

Not my idea of 'HIFI', but to each their own.

Well, you can extend the sides, back to make a separate horn cab on top or you can tune the vent with a little extra effort by adding a full width baffle in lieu of the stock 'L' bkt. with a shelf to close the bottom off, tuning the gaps on either side of the horn with tubes, then doing a bit of reflections damping that does double duty covering them up if no grills.

GM

**Steve Mac** · August 7th, 2020, 10:02 PM

Originally Posted by Phil-G

There is a way.
It's not a scary monster after all is it? if you want the 511 horn enclosures let me know

Those are very cool looking.
I love the 511 horn enclosures. Would love to own a pair of those!

**Phil-G** · August 7th, 2020, 10:40 PM

Originally Posted by Steve Mac

Those are very cool looking.
I love the 511 horn enclosures. Would love to own a pair of those!

pay for the shipping 33908 and 50$ and they're yours. they come with 846b Xovers.

the 805s won't fit.

**Steve Mac** · August 8th, 2020, 10:47 AM

Originally Posted by Phil-G

pay for the shipping 33908 and 50$ and they're yours. they come with 846b Xovers.

the 805s won't fit.

pm sent...

**LOUDER** · August 8th, 2020, 05:47 PM

You could laminate them in formica, wilsonart, or nevermar. Have the wife pick out the color. Once your eyes are closed you w'ont see the color but see the sound!!!

**Bagadan** · May 30th, 2023, 01:05 PM

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