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In Reply to: RE: Advent Evolution posted by spons on June 29, 2015 at 09:27:49
Madisound calculated 1.5 cubic feet to get a Q = 0.7. Anything close to that would be OK. The Advents are 1.6 cubic ft. So various AR's using the 10" woofer, KLH 6 or 23, Advents up into the 5002, models from ADC, Fisher, Scott, Marantz, etc. Lots of solid boxes with older drivers around. You could also use a ported cabinet if you close the port and fill the cabinet with Acousta-stuf or fiberglass.
A bigger box will lower the Q, a smaller one will raise it and raise the Fb, the in-box resonant frequency.
The frame on the A26RE4 is a little bigger than the usual 10"; so it won't fit into the recess for a standard 10" and you'd need to be handy with a router. If the original woofer mounted to the front of the baffle and the hole is close, it would be a lot easier. Adapting the SEAS woofer is where ingenuity comes in.
Jerry
Follow Ups:
Hi Bold Eagle, I know Advents were beautiful and sold thousands,but when you look at the Advent tweeter side by side with the Seas it's like looking at a Ferrari and a Yugo, the Seas being the Ferrari. Glad you went with the better innards...Mark K.
Mark,
Thanks. It took me a while to break down and spend the money. The fact is that tweeter technology was still not very good in the late 60's and early 70's. Laser holography was the tool that finally allowed them to see what was happening. Before that, everyone was trying different approaches to try and get smooth response, good power handling, wide dispersion, and that could reach low enough to make a good two way. Henry Kloss's Advent tweeter was one of the better ones at the time. A lot of companies were still using cone tweeters.
I don't know if it's still true; but by the later '70's, the Advent had the largest sales volume of any speaker in terms of number of units. The JBL L-100 had the record for dollar volume. They sounded good, they measured well, they had nice looking cabinets, and they didn't cost a lot. The utility model was $102 each in 1970 and the walnut veneer was $114.
But time and technology move on and I have decided not to fight it any longer. I think I pushed what was possible with Advent drivers about as far as was practical. Advents first hit the stores at the end of 1969. That was 46 years ago this coming Fall.
Jerry
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