Pic of new Stonehege V's with GPA's 604s

[atilsley]

John

Thanks.

These are my first Altec's.

Over the last few years, I've developed a small custom building horn speaker business...Creation Audio...so I've tended to stay with Lowther, Tannoy, Fostex, etc.

I've started talking to GPA to see if I can promote their gear 'down under.'

The 604's are the first project....and I went for the biggest cabinet advised. (I just love building big things...!)

I'm also talking with Bill from Martinelli Horns to use his wooden 400Hz Trachorn paired with the GPA 902 comp driver, plus a 416 bass...in a new/old Model 19 config. That will be fun.

Andrew

Home

[atilsley]

Oh, meant to ask.

The gent I'm building these for has asked that the drivers be mounted from inside the front baffle...hence the removable back panel. (Similar to the Hiraga cabinets.)

Todd mentioned he wouldn't necessarily do this.

Any thoughts on possible sonic losses this way? (My cabs don't have the flared cut-out like the Hiraga though....)

Any thoughts on mounting techniques (of the drivers, that is!)?

[atilsley]

Internal volume is 246 liter (15,020 cubic inches, 8.7 cubic foot).

Is that big enough for bass....!?!

What's the cubic foot of the bass ca of the Model 19, for example?

[magnarc]

That volume is about that of the ALtec 620/620A cab, which was the largest and imho best sounding cab for the 604s.

The Stonehenge V was designed to have around that same volume, just with a smaller footprint.

[atilsley]

Thanks...That's what Todd suggested....though I always thought the 620 was smaller...?

[Altec Best]

Thanks...That's what Todd suggested....though I always thought the 620 was smaller...?

No the 620 cabinet is around 9 cu.ft. which would be slightly larger if Magnarc's dims. are correct.GM said to me awhile back that any Full Range cutout ie; 604 in a cabinet should have the cutout flared.

[atilsley]

OK, thanks guys.

we might front-mount the driver to be safe.

[analog addict]

Hmmm....good question. Here's the spec page, and here are some cabinet plans.........

The grills add about 2" to the depth, and the cabinet necks down slightly between the horn and woofer enclosures, but it is continous internally. One of the real experts will undoubtedly have that number.

I've also been told that if you have the room for a 18-20 cu ft cabinet, you can push 604's down to close to 20 Hz....

[Panomaniac]

Yes, I've done it. You end up with what is called an "Extended Bass Shelf" alignment.

[atilsley]

Latest pics attached....lovely...spent hours rubbing in heavy wax polish.

The pics don't do it justice...but reminds me of this from Shindo.

Had a pleasent evening comparing Unison KT88 SET amp (12-watt) vs Unison Push-Pull EL34 (40 watt). The SET was the winner by far.....PP too much (even) given my quite large room.

But, what a BIG sound overall....quite stunning...with great warm bass to 34Hz...then rolling off to 28-30Hz.

More pics here from Stereo Net AUST.

Very happy....