Altec A7 measured...

**paul300b** · August 12th, 2013, 07:12 PM

Hi,
First post here. I own a7/ 825 cabs loaded with 802-8g and 416-8a drivers. (plus corner cabs with 803b/ 288-16g's). A couple of weeks ago this was posted on an Australian guy's site.
Red Spade Audio: Altec A7 Voice of the Theatre horns measured

Both the 511 horn and cab with 416-8b don't measure too well. Anyone measure theirs?

**Phil-G** · August 12th, 2013, 07:57 PM

there are a few A7 threads here. lots to read.

you've come to the right place. from my very short experience with these. and reading about them, these are common problems with stock boxes. i read an article from the 60s that says as much

**gortnipper** · August 12th, 2013, 08:09 PM

Welcome, Paul!

**paul300b** · August 12th, 2013, 08:31 PM

Originally Posted by Phil-G

there are a few A7 threads here. lots to read.

you've come to the right place. from my very short experience with these. and reading about them, these are common problems with stock boxes. i read an article from the 60s that says as much

Thanks. Is that article online? I would be good to know how to fix, pref without active DSP.

- - - Updated - - -

Originally Posted by gortnipper

Welcome, Paul!

Cheers David! Nice to be on this side.

**Phil-G** · August 12th, 2013, 09:15 PM

Altec Lansing VOTT Clones? - Page 2 - diyAudio
this isn't the article i'm looking for, but pano who posts here from time to time explains things fairly well.
still looking though.

GM · August 13th, 2013, 12:25 AM

The woofer appears to be half past dead [needs magnet drained/recharged at the very least] and I've no clue what's causing the broadband dip in the 511 as I've never seen anything like it in any Altec or similar design horn regardless of driver brand/model.

Bottom line though is that it takes significant EQ to flatten one out over a wide BW because it was designed to be driven with either a ~matching impedance amp or at least one with variable DF tone controls plus be heavily toe'd in to compensate for its rising on axis response in a HIFI app if no super tweeter horn is used.

GM

**fpitas** · August 13th, 2013, 03:59 PM

Originally Posted by paul300b

Hi,
First post here. I own a7/ 825 cabs loaded with 802-8g and 416-8a drivers. (plus corner cabs with 803b/ 288-16g's). A couple of weeks ago this was posted on an Australian guy's site.
Red Spade Audio: Altec A7 Voice of the Theatre horns measured

Both the 511 horn and cab with 416-8b don't measure too well. Anyone measure theirs?

Zilch was more conventional, and measured the 511 with a working driver, in his case a B&C DE250:

DE250 on 511A.jpg

From here:

http://audiokarma.org/forums/showpos...96&postcount=1