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RE: Electro-Voice Regal lll

Posted by Paul Eizik on January 5, 2017 at 09:31:37:
Craig

The mid horn driver looks like an EV T25. It's hard to see from the pic of the crossover can contents, but are there only 2 caps and 2 coils in there? If so this would indicate that it's a first order 6 dB crossover. A 4 Ohm 12W seems unlikely, but you won't know unless you measure it. The red surround on the woofer indicates it's an EV cone and not an aftermarket re-cone. BTW Radio Shack has a pocket sized self ranging multimeter on sale for under $20. In the pic the woofer is wired in standard polarity with the blue wire going to the woofer plus terminal which is identifiable by the redish (faded) washer at the base of the terminal, while the negative has a faded blackish washer. With a first order crossover the mid and tweeter are wired in standard polarity, but with a second order crossover the mid is wired in reverse polarity. The wiring polarity to the mid, plus the crossover parts count, would indicate what's actually going on there.

Crossover design is "a piece of cake" nowadays once you know the driver impedances and the crossover points (see link). If the original crossover is a first order one, you can easily reproduce a sim of that too. EV used second order crossovers in their later X series so the link here is to that type.

The mystery deepens! (also see Dave's comments below.)

Paul