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24.20.105.115
In Reply to: RE: Electro voice driver question posted by Bill Fitzmaurice on December 02, 2022 at 12:01:11
I surmised that, but not many options if he wants EV woofers. I have about the same woofers that he pulled out, with close numbers on the magnet, and a Fisher label on it...mfg. by Fisher. Have a pair, not 4.
Follow Ups:
If the original woofers weren't EV there's no reason to want to replace them with EV. If EV ever made an acoustic suspension woofer I'm not aware of it. It just wasn't their thing. Back in '69 you didn't go to EV for acoustic suspension, you went EV for Sentry IV.
or Eliminator cabinets.
Dayton Audio DC300-8 12" Classic Woofer might work.
Looks very good indeed - except it needs to be 4 ohms.
There's a DCS305-4 subwoofer that's not quite as close in parameters, but IS 4 ohms.
If there's 2 woofers, then why not use 2 of the 8 ohm woofers I suggested at a cost of less than $300 for 4 of them along with just using half the Inductor value in the crossover?
If the rest of the drivers have L pads, then they can be tweaked by about +3 db with no problem.
That might work. The crossover would need to double the capacitance. (I posted the crossover elsewhere in this long thread; here it is again.) Only the tweeter has a (switched) attenuator though.
Edits: 12/03/22
The Qes/Qts are too low, Vas too small and xmax too short for acoustic suspension.
I'm thinking Qes might be better at .7 too. I knew it was marginal, but not too many drivers that are CHEAP to buy will just drop into a given box.
Price isn't the issue with high Qes drivers. If anything high Qes tends to be most common in the lower price range. It's the combination of high Qes, an inexpensive driver trait, with high Xmax, an expensive driver trait. Acoustic suspension also works best with high Vas, which is something that you pretty much don't find in today's drivers. It all comes down to demand. Manufacturers pretty much abandoned the acoustic suspension speaker by 1980, thanks to the proliferation of vented boxes brought about by Thiele-Small. With no market to sell them to manufacturers stopped making acoustic suspension woofers. The closest thing to them today are subwoofer drivers made for use in sealed cabs, but they don't have midrange extension that enables them to cross over above 200Hz, let alone 1.8-2.5kHz like AR/KLH/Advent.
Great presentation of driver history.
There should be enough box volume there for the OP to make a ported box out of it.
I would suggest a different pair of drivers for that of course.
As would I, which takes us back to learning how to use modeling software.
On the subject of the death of acoustic suspension, I was touring in '73, had left my stereo with my girlfriend in Boston, so I needed a rig to learn new songs. I went into a Lafayette Radio in St. Louis where they had a listening room with all of their speakers set up, with a bank of switches to go from one to another. The ported cabs all sounded louder, of course, and since louder is perceived as better I got a pair of Lafayette ten inch two-ways and receiver. I had them for over twenty years. I bet it was exactly what's in this picture. I never did get back to Boston, so I never ran into Henry Kloss again to offer my apologies. :)
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