Altec 421-8H Series II

[Old Guy]

Essentially you can't redesign the box. If you change the dimensions everything else changes.
It becomes a whole new design.

There are a number of different bass box design programs available for free. Some do just basic boxes, others do ducted ports. The EV is essentially a modified ducted port design. A program that gives you one of those is probably as close as you'll get.

Just curious in case someone asks- are that series of prints archived somewhere on the web?

[stratsrus]

Yes, there are several plan designs available in pdf. format. http://archives.telex.com/archives/EV/
I understand that changing the dimensions changes the design, the point of making it bigger would be to make it a sound a little less flat.

[stratsrus]

I downloaded the TL-606 plans. The exterior dimensions of the cab are H 23 3/4" W 19 1/4" D17". I would not mind taking the design of this cabinet modifying it to be a little bigger but based on the T/S parameters of 421 8H series II. I have looked at a couple speaker design programs but have not been satisfied. The computation of the cubic area is straight forward, I do not know how to compensate for this type of port. I was hoping to have something smaller than an 816 but a little larger than the TL-606. Any suggestions would be welcome

[bfish]

Without trying to redirect Lawrence from his plans, I thought I'd add some info I just became aware of regarding cabs for the 421-8HII. The 612C utility cab is intended for this driver, as well as the 416-8A, 418B&8H, 421A, 515B, 604E, & 605B. Plans on the Lansing Heritage site at;

http://www.lansingheritage.org/images/altec/plans/1970's-lf-plans/enclosures05.jpg

[Old Guy]

Good post bfish. That box is a bit bigger, and has the virtue of keeping the system all Altec.
If I were using them I would stack them on their sides making 28" the width. The cones look like they would be closer together that way and should couple better.

The standard disclaimer etc. etc.

[LICORNE]

Hi,

Here is a picture of what the 612 and 614 look like side by side.

http://www.lansingheritage.org/image...pro/page14.jpg

.............................................

[Old Guy]

Thanks Lawrence.

I have a large archive of cabinets- always someone asking for something.

[aeyb701]

Hi all:
Forgive me if posting a notice of sale is not allowed- I did a cursory check to see-but someone in no way connected to me is selling a pair if 421-8H's in Ottawa, Ontario, Canada for CDN$250.00. He reports they have the white frames and are in good condition, though one cone has a stain. He asked me if I wanted them as I inquired after a pair of 511B's he had for CDN$60 (of course they sold soon after posting on Canuckaudiomart). I said thanks but already have a pr of 416-8B's "half here", but offered to post it on this forum as they sound like a bargain. His email is [email protected]
Steve Rizewiski is his name.
Image can be seen at:
http://www.canuckaudiomart.com/details/30992-
Note he says sold but I do not know if that applies to the woofers as he emailed me after the fact.

Jon Archibald

[aeyb701]

Hi all:
Forgive me if posting a notice of sale is not allowed- I did a cursory check to see-but someone in no way connected to me is selling a pair if 421-8H's in Ottawa, Ontario, Canada for CDN$250.00. He reports they have the white frames and are in good condition, though one cone has a stain. He asked me if I wanted them as I inquired after a pair of 511B's he had for CDN$60 (of course they sold soon after posting on Canuckaudiomart). I said thanks but already have a pr of 416-8B's "half here", but offered to post it on this forum as they sound like a bargain. His email is [email protected]
Steve Rizewiski is his name.
Image can be seen at:
http://www.canuckaudiomart.com/details/30992-
Note he says sold but I do not know if that applies to the woofers as he emailed me after the fact.

Jon Archibald