Vintage Cardioid Microphone made in The USA featuring Variable D technology in Very Good Condition.
The Buchanan Hammer because, at trade shows, they would demo the mic, unplug it, bang in nail (like a Hammer) and then plug it back in and demo the mic again.
The original claim was that these were virtually indestructable from normal use.
Originally designed as a Public Address / Announcer microphone, it quickly became a popular mic for "Garage Bands" in the sixties.
Close to the design of a Shure SM57, people have used it for snare drums and guitar amplifiers and even vocals.
Built like a tank, and featured EV's "Variable D" technology.
"Multiple openings at variable distances (thus, “Variable-D”) from the diaphragm to allow sound pressure at different frequencies to act upon the back of the diaphragm. The vents furthest from the diaphragm were coupled to low-pass filters (interconnected acoustic chambers, some of which were covered in felt or some equivalent damping material), allowing the microphone to retain its directivity even for low-frequency sounds."
These featured a special 4 pin connection. You can get an adapter cable for use with a regular XLR connection.
This Mic doesn't have that adapter cable, but you could hard wire an XLR to the existing end.
A staff member has the adapter cable and tested out this miocrophone - it works!
This Consignment Mic is, technically, in Excellent condition but you'll need either the adapter or hardwire in an xlr plug/cable to use it.
The sound is rather mid heavy. Not very round or robust or flat sounding. Think of the typical elementary school public address system.
There are a number of videos on youtube with people using the 664 for different applications/sound examples.
Not a very "modern" sounding microphone. Remember, every mic has an application - be it a $100 or $6000 microphone... they all have their use/and application.

