I guess I will be the voice of destruction. I got a pair of 604's about 3months ago. I was so excited. Got them to my studio. I record in a 25'x40'x15' room made of solid concrete from the 1940's and wood ceiling.
The board, a PM1000, the tape machine, a Roland VM3100 and Nuendo as the tracker.
I placed the microphones XY and parallel to eachother (1 over the hat and the other over the floor toms) at various heights and sitances. After tracking, using the mics open and with the -10pad, I quickly removed them and hid them.
No eardrum, should have to go through hi's like that. It sounded like glass breaking. My cymbals sounded so sharp in the hi end spectrum that it sizzled.
These mics, for me, that's important here, for ME, did not work at all as overheads. I ended up getting a pair of AKG C300SE w/ CK91 capsules (AKG C391's) and I am much happier. Now, this is not to say I won't find something to use the 604's on. Maybe piano, or acoustic guitar? Maybe toms? I dunno. But for overhead cymbal mic'ing, on my rig...AAGGHH!!!
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