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RE: Electro-Voice Regal lll

Posted by Paul Eizik on January 7, 2017 at 11:47:23:
Craig

It looks like you have a first order crossover in the Regal 111. This is to say that the capacitors and coils in the crossover will limit the drivers to overlap into each others territory by a 6 dB per octave (first order) roll off, and the drivers will be primarily limited to the frequency range they perform in best.

The 2.84 MFD (micro-Farad or uF) capacitor would indicate that it's for a 3500 Hz crossover point for an 8 Ohm tweeter. The 5.7 MFD capacitor indicates that the mid driver is probably a 16 Ohm unit, though about 10uF would be a more likely value.. It's unlikely that the coil inductors will have the values printed on them (in milliHenrys), but they are likely still usable. One of the coils will start limiting the upper end of the woofer response at 1000 Hz, while the other will start limiting the upper end of the mid response at 3500 Hz. It's advisable to replace the 2.84 uF and 5.7 uF caps with new ones, try Parts Express and use the nearest standard value good quality caps.

Do you know how to solder? It's time to learn! You should be able to find soldering instructions online. The Regal 111 should prove to be a nice vintage speaker with a re-cap, just resist the temptation to play it super loud with a high powered transistor amp or you risk blowing a driver. A modest powered tube amp would be ideal. A test with a multi meter would indicate if any of the drivers are already blown which would complicate the project to say the least., and you don't indicate if you've tried to play the speakers already. If the treble and mid volume controls (L-pads) are scratchy or problematic you may be able to clean them with Caig Deoxit, but if you replace them they must match the impedance of the driver (i.e. 8 or 16 Ohm units). The values may be printed on them. BTW the link I provided in the previous post will not work with a less than 3 octave spread with a first order crossover as it's optimized for direct radiators and not for horns.

Good luck and welcome to the Electro-Voice Brotherhood

Paul