BIB utilising twin CSS WR125ST's?

[planet10]

Re: Calhoun's bigger sibling???

occamaudio.... ie 2 x CSS SDX7's and a Wavcore tweeter

I don't know where those plots come from -- all the measurea of the SDX7 i've seen have it plummeting above 900-950k (depending on treatment) -- i use that as part of my XO in Tysen.

Is it feasible to resize the (side-firing) Calhoun box to utilise the above drivers?

Shadow was designed for 2 Extremis, SDX7 should work. I may even have a revised variation in the queue for an SDX7 specific one.

dave

 

[Brisso57]

Scottmoose will have to help with that one. The Calhoun is a simple box so I'm wondering if the line is long enough ie: the line before it enters the horn. Maybe a new design in the works?

Cal,
That picture you posted illustrates just how much timber goes into making those stepped vents.

Suggestion #1
Use an angled piece of ply with strips of 45 degree triangular moulding glued across it; or

Suggestion #2
Use a double thickness of ply angled, but with 90 degree "V" trenches routed (routered?) across it.

Either way, fewer trees die!

cheers

Doug

PS Perhaps the best option is to stack to make the lower vent, and make the upper one using the suggestions above - lowering the C-of-G and making the box that much more stable.

 

[Brisso57]

Re: Re: Calhoun's bigger sibling???

I don't know where those plots come from -- all the measurea of the SDX7 i've seen have it plummeting above 900-950k <SNIP>


dave

The drop-off doesn't appear too savage on the graph at the CSS site:

www.creativesound.ca/pdf/CSS-SDX7-data-261207.pdf

(Mind you, I haven't heard a SDX7, so I'm speaking as a novice.)

... and granted, the "mega-Calhoun" wouldn't have high sensitivity.

Doug

 

[planet10]

Re: Re: Re: Calhoun's bigger sibling???

The drop-off doesn't appear too savage on the graph at the CSS site:

That was data supplied by either the fellow who designed the driver (IIRC, it has been a while since i did that document)

Dug out one of the measures Al Wooley did... they go a bit higher than i recall (the red one is with the 1st level of treatment)

dave

 

[Cal Weldon]

Originally posted by Brisso57
Cal,
That picture you posted illustrates just how much timber goes into making those stepped vents.

Yes but I thought it an excellent use for an old piece of that nasty stuff.

Suggestion #1
Use an angled piece of ply with strips of 45 degree triangular moulding glued across it; or

Sounds like a lot of work considering it probably sounds ok as a flat piece.

Suggestion #2
Use a double thickness of ply angled, but with 90 degree "V" trenches routed (routered?) across it.

Jiminy crickets man. I'm thinking the stepped pieces add more character than anything that can't be looked after with some well placed stuffing in the horn throats. They're the only plywood boxes allowed inside, there's a kind of neat factor.

Either way, fewer trees die!

cheers
Doug

Cheers Doug

That's true, it's just that mdf is not my friend and I thought that's exactly what I would want to use it for.

PS Perhaps the best option is to stack to make the lower vent, and make the upper one using the suggestions above - lowering the C-of-G and making the box that much more stable.

Now we're talking.

 

[Brisso57]

Another candidate driver for a "mega-Calhoun"?

OK, How about the Tang Band W6-1721?

6" mid-bass.

Apparently good frequency extension beyond the telephone band, Fres at 40Hz, 8mm xMax, not a bad Vas (29L), and OK at 88dB.

Here's the data:

www.parts-express.com/pe/showdetl.cfm?Partnumber=264-874

www.parts-express.com/pdf/264-874s.pdf

cheers

Doug

 

[Brisso57]

Re: a further candidate driver for a "mega-Calhoun"?

OK, How about the HiVi M6N?

6" mid-bass.

(& yet again with a helper tweeter.)

Here's the data:

www.parts-express.com/pe/showdetl.cfm?Partnumber=297-441

cheers

Doug