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The Seas 23FE-W used in the A-25 specs out for an optimal cabinet size of 3.5 cubic feet with a port. The original cabinet is less than 0.7 with an aperiodic vent. Yes it is true you do get a better F3 with a vent and tighter bass with a closed. The aperiodic vent seem to strick a good balance between both worlds with this woofer.I had some extra cabinets kicking around, a 1.5 cubic foot with a rectanglar vent. I put in the drivers and couldn't believe what that woofer was capable of. If the original cabinet was a mere few inches bigger This speaker would blow your socks off. It's almost a shame the original selling point design was for such a small box.
Next month I'm going to try a 2.5 or maybe a 3.5 cubic cabinet and see if the difference continues.
Follow Ups:
Yep, you've discovered the 'dirty little bass secret' used by countless companies; smaller box w/ higher Q driver yields a 'bass hump' response that many find appealing and which saves $$$$$ on cabinet costs.Pete (gimme 20 Hz or give me a sub-woofer) S
If nature loathes a vacuum then why do vac. tubes sound so natural???
I've found on some of the modeling programs you can get a "hump" way before rolloff. But that could be a good thing if you don't know it's there. I'm finally building some interesting stuff that sounds good too.
Build a mathematically correct box for the dang things and listen to the windows rattle. I think a true real 30hz is possible.One other problem is that the Le is two high for the 1500hz crossover so the next thing folks need to do is design a three way crossover starting at about 800hz.
The same goes for the JBL 123A-1 and maybe the Klipsch Herresy as well.
For some reason the engineers on these systems just didn't use the right boxes. I don't care what other inmates say. The A-25 is near miss design.
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