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Altec Valencia Cabinet Mods
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Posted on December 10, 2009 at 12:14:19 | ||
Posts: 404
Location: Northern NJ Joined: May 29, 2004 |
I've got this pair of Altec Valencia's that I picked up this summer. The drivers are nice. The cabinet was beyond hope. So I started to research these speakers. I measured the T/S parameters and did simulations on different cabinet sizes and tunings. GM provided some valuable info on this forum as well. First I went to bi-amping. I found 1200 Hz to sound optimum at 24 db/octave (Linkwitz-Riley). KT-88 tube amplifiers top and bottom. Next I pulled the high frequency horns out of the enclosures, and closed off the opening with ¾†plywood, which was drilled to receive 4-3†id schedule 40 PVC pipe ducts. I turned the enclosures upside down to elevate the 15†416Z off the floor. The horn went on top. Each horn received an entire bar of Duc-Seal clay just above the vertical fins, 1/2 on top and half on the bottom. And finally, I added a 3 cubic ft box to the enclosure. First I cut large openings into the removable back of the enclosure. Then I glued the new box to the back, covering the new holes. Then I replaced the back onto the box. So I ended up with around an 8 cubic foot box, and the ability to change ducts at will. I will experiment around with this for a bit until I settle on the best tuning. Then I will build the final cabinets. I’ll post my progress. Comments and questions welcomed. Regards Les |
RE: Altec Valencia Cabinet Mods, posted on December 10, 2009 at 13:12:30 | |
Cool....keep us posted on your updates. |
RE: Altec Valencia Cabinet Mods, posted on December 11, 2009 at 15:55:53 | |
Posts: 404
Location: Northern NJ Joined: May 29, 2004 |
Did you ever experiment with the 802? |
Take out the bug screens..., posted on December 14, 2009 at 09:58:07 | |
It does not make the driver brighter. You gain clarity and imaging. Made a bigger difference than damping the 811 horn. |