Foam Core Board Speaker Enclosures?

[xrk971]

Originally Posted by Cal Weldon

I use the CSS driver as the Fostex is back in the 27". This will be 30" at the points. I am thinking the channels that start at 1" width should be around 4" deep. What do you think?

Cal,
the driver chamber throat CSA is about 130 cm sq, the volume at 4 in deep is 3900 cm cube, thus the upper cutoff freq given by fh = c x Athroat / (2 pi x Vchamber) = 180 Hz. Perfect for bass enhancement from horn. 4 inches is good number.
X

[Cal Weldon]

Excellent, thanks.

[guangui]

Originally Posted by Cal Weldon

Another run around trying to find the foam but I finally found it. We are lucky that we seem to have a 1/2 dozen Dollarama's within a 30 minute drive.

Fronts and backs are double layered foam, offset to make 30" square, now gluing with the help of some 416's.

I will go to the repro place tomorrow to enlarge my drawing.

Nice press!!!

[guangui]

Originally Posted by xrk971

Guangui,
For the small cabinet you describe you may be better off buying a couple of computer monitor 2.1 speakers and use the sub cabinet and driver. The cabinet I have in mind for the 40 Hz to 100 Hz with the NS6 is about 27 in tall x 8 in wide x 12 in deep - kind of big but the performance you get is good. A very long folded transmission line might be able to fit in the dimensions you have to reach 40 Hz. You need about a 2.2 m pathlength to get to 40 Hz so the channel will probably spiral around like a Cornu but not be a horn - a tapered TL spiral that gets smaller at the port.

Yep. that's more or less the dims. I came up with an NS6. Too big for my purpose. I can reach similar low freq. (39 Hz) with the 5" Visaton in a much smaller enclosure. Let me think about it, and see if it would work as a compliment to a pair of full range on-wall Cornu-Spiral.

[xrk971]

Why would a 5 in Visaton reach 39 hz easier than 6 in Aura ns6 in smaller enclosure? Lower fs?

[Cal Weldon]

Originally Posted by guangui

Nice press!!!

Thanks. I have to keep them close to me or they might slip under the radar. I really do owe them some of my time.

[Cal Weldon]

I will need a tweeter with the CSS mid bass drivers so the OEM polycarbonate domes, Technics paper cones, Hi-Vi SS1-II fabric domes and the CSS RT1 ribbons all followed me home today.

I have a feeling the ribbon motors will take up too much space inside but I am hoping to find a nice match with one of the other three, something I can fit fairly close to the woofers.

Just thinking out loud for now as that part is still days away.

Cheers.

[xrk971]

I vote for Hivi fabric domes. Do you have enough space?

[xrk971]

Originally Posted by Cal Weldon

Thanks. I have to keep them close to me or they might slip under the radar. I really do owe them some of my time.

What is a 416?

[guangui]

Originally Posted by xrk971

Why would a 5 in Visaton reach 39 hz easier than 6 in Aura ns6 in smaller enclosure? Lower fs?

Not much lower fs, but still lower at 52 Hz vs. 55 Hz for the Aura. There are other considerations. Here are the specs.