604's in A7 cabs

[Skip Pack]

I've run across this mentioned in passing a few times, but, since I have
some freshened 604C's, I was curious to hear how they might work in the
basic 825 cabinet with the porting optimized by experimentation. Has
anybody here followed this path?

thanks,

Skip

[gearfreak]

Not yet... but perhaps this winter!

[Panomaniac]

I heard them and loved them many years ago. Wanted to try them again this year, but you have to cut a hole in the rear panel of the box. The coax drivers are a bit too deep to fit.
Or make a new panel with the hole in it.

I remember it as a very nice combo.

[Skip Pack]

I was thinking that, since I would build these from the plans, I might
arrange to fill the volume around the flairs on the sides and maybe the bottom
with foam for rigidity, sort of squaring off the horn into an internal block.
I could then regain the lost volume by making the cabinet deeper front
to back, or maybe just the top half adding enough depth for the 604.

[GM]

Experimented with 604E in scratch built A7-500 (825 cab) tuned to ~40 Hz using 3/4" marine grade ply and extra bracing. Horn section damped with kitty litter. Wound up lining the top inside of the flare with a thick foam and putting the HF horn mounting angle back on to brace the top. Sounded pretty good to us, but worked even better as a three way with the 511, though the owner ultimately put them in a false wall IB with 515B 'helper' woofers which was best overall.

GM

[Altec Best]

You may want to ask Analog Addict as he is running a pair of 828's/604's now I think, maybe he can give some help.

http://www.hostboard.com/forums/1834553-post1.html

[magnarc]

Will the ferrites fit without modding the back panel?

[bowtie427ss]

Will the ferrites fit without modding the back panel?

Easily. The ferrite 604's are about the same overall depth as a 515B, give or take a 1/4 inch. The alnico 604's don't interfere much, about the depth of the HF cover, just enough that you have to modify the back panel to accept them.

[GM]

Interesting, the rear mount published dims says that it would be a press fit in the 825 and too long for any 828 or clone made from 3/4" or thicker material. Only one way to know for sure though.

GM

[Panomaniac]

Hmmmm..... I have a pair of the ferrite 604s. They are too deep for my cabs. Not by much, just enough. Could be some of the 828 cabs are a bit different?

I'll be over at Analog Addict this afternoon. Don't know if he has the 604 rig running - I'll let you know!