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RE: Electro-Voice Regal lll

Posted by Paul Eizik on January 13, 2017 at 11:07:34:

Dave

Thanks for shedding some further light on some of the more obscure EV horns. Attached here is a page from my early/mid 70's How to build and Electro-Voice Component Speaker System catalogue. The MF1 horn/ driver is pictured (viewed from the front) along with the Michigan 1000 Hz crossover and the Wolverine CR35 3500 Hz crossover, all of which are 1st order. The budget tweeter is the TW35. All of the drivers in the catalog are 8 Ohms at this point, even the woofers. Note the budget crossovers are 1st order, which was common at this point as the 1st order type has fewer parts. R.H. Small published his AES paper Constant-Voltage Crossover Network Design in 1969-70 which elevated the 1st order series crossover to the top of the food chain, but the need for driver protection persisted in keeping the higher order crossover networks dominant, until the SET craze started here in the 90's with Sound Practices magazine. One of the ebay ads implies that the T35 diaphragm is used in the MF1 horn, and is still available from eBay suppliers, but I dunno how true this is. Note the black paint on the upper end EV stuff and the grey paint on the budget stuff. EV bought the University speaker company at some point, and products which had been superceeded by newer ones got down graded with a grey paint job and the University badge. Some budget stuff was badged Michigan, and the budget Wolverine stuff seemingly started to disappear at around that time.

Note the smiley face sticker I added to the scan, which transforms the copyrighted material into an artistic collage where fair use doctrine applies.

Paul