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RE: Electro-Voice Regal lll

Posted by Paul Eizik on January 4, 2017 at 14:40:45:
C

The crossover has a part # rather than a model # (which would have begun with an "X" like the later EV crossovers: X8; X36 etc) indicating that you have an early model. Check with a Volt Ohm Meter to see if the woofer is a 16 Ohm unit (which is likely for early ones though it will probably not be marked on early units). The crossover can looks like it has the crossover freqs marked as 1000 Hz and 3500 Hz. With this and the driver's impedance known you can use one of the online crossover calculators to design your own crossover, and a second order (12 dB) Butterworth should work fine (though it all may not fit into the original can). While you are at it check the other drivers too just to see that they match the woofer as 8 or 16 Ohm units, if not this will have to be factored into the crossover design. It's hard to tell from the pic but the T350 looks more like a later version from it's black finish. A 16 Ohm T350 will measure about 12 Ohms with a VOM, an 8 Ohm one will measure about 6 Ohms, but use 8 or 16 for the crossover calculator.

Easiest way/long shot solution: if you know someone with an ESR (effective series resistance) meter, have them check the capacitors in the original crossover to see if they are still functional. Using the similar Regal 300 8 Ohm crossover as an example you may be able reverse engineer what the cap value should be and then replace them, if you can solder. The original inductor coils should still be useful.

Hope this helps

Paul