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9Jan/120

Electro-Voice 664 Dynamic Microphone

EV664-1

Electro-Voice Model 664 Dynamic Mic

I got this cool old microphone in for some minor repair. It's a classy-looking art-deco kind of mic from the 1950s and 60s, with a very durable chrome finish.

EV664-connector

Electro-Voice Model 664 - four pin connector at the mic end.

This one is in really good condition, complete with a solid cable (I don't think it's the original). I soldered a modern XLR connector on the end. It appears they usually came with a 1/4" phone plug. It can be set for high impedance or low impedance (150 ohms) by swapping the white wire in the four-pin Amphenol connector at the mic end. It was originally set for high impedance, which is likely most suitable for plugging into a guitar amp. I tried the mic out that way, plugged into my Allen & Heath console, and it didn't sound very good. It was a little tinny (using my voice as a source), and there was significant noise being picked up. High impedance sources are much more susceptible to picking up electromagnetic interference.

EV664-2

Electro-Voice Model 664 Dynamic Mic

So I swapped the white wire from pin 2 to pin 3 at the mic end. The instructions talk about pulling the "slip pin" out to effect this change, but this connector had the wire soldered into the pin. After the swap, it sounded way better, and the noise was gone. I pulled out a little 1 kHz and boosted about 120 Hz a little, and it sounded pretty good on voice. Looking at the frequency response, this mic really rolls off the low frequencies in order to reduce the proximity effect. The response curve from the data sheet shows 100 Hz to be 5 dB down compared to 1 kHz, so I guess I'm levelling that off a little.

EV 664 Frequency Response

There is more information on Recording Hacks, and some great pics and the engineering data sheet on Coutant's website.  Read some background on the Variable-D design on ProSoundWeb and EV's website.

I've got a bunch of pics on my flickr. This is such a groovy looking mic, it's too bad I have to give it back to the owner!!

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