How this A-7 cabinet mod..

[drummerwill]

I posted this on AA and diddn't get much response......

I was just searching the web looking for a drawing of a A-7/ 828 cabinet.
While listening to my A-7's with a sub. I got down to listen to the vent port to see how much low end was coming out. I was surprised to hear so much volume but sounded boxy and sloppy.
Then I had this hairbrain idea to make the lower part of the cabinet into a scoop like BLH. I've got a pair of Altec 805's in BLH that sound pretty good. I like the bass in that BLH very smooth and deep.
What do you guys think would there be any advantage to Scoop-ti-fying the the A-7 cabinet?

Have fun
Willie

[Old Guy]

Altec contractor in columbus, Boller Electronics, built some of those back around 1973.


I DON"T like back loading horns. Tons of phase issues. And no way to correct. I wouldn't want such a cabinet, but hey, it's a free country.

The problem is the long back path is necessarily way out of phase, correct for it and screw up the mid bass.

Better IMHO to just build cabs for specific ranges, I just feel the BLH is just too compromised.

An opinion- put a dollar with it and it will get you a cup of coffee- at White Castle, not Starbucks.

[Tom Brennan]

Perhaps listening to the vent alone sounds sloppy because the transients are higher in frequency and coming off the cone and you weren't hearing them.

IME ANY low bass listened to without the corresponding upper frequencies sounds boomy and loose.

[ngccglp]

Agree with Tom, the definition of bass is derived from the upper freq by the horn/driver.

I think the 828 is very good for what it was designed for. Bill from GPA suggested the 515-LF to get the best bass response from them. Anybody using that combination or has heard that?