From July issue of EQ magazine...
1) Place a book size object under the front of the guitar cabinet to tilt it up. (about a 3" thick book)
2) Place a solid flat object (they refer to it as a diffuser) about 5 feet away from the cabinet tilted back like a ramp at about 60 degrees. The object can be glass, metal or wood and should be @ 3' x 6' to 4' x 8'. Make sure it is propped up securely and doesn't rattle.
3) Place a large diaphragm condenser mic @ 6 to 8 inches from the middle of the face of the "ramp" with the capsile facing perpendicular to the face of the ramp.
4) crank the amp up and start recording.
A few details...
- experiment with different materials for the "ramp" they diffuse diffenently and will change the sound
- move the mic until you find the sound you want (sweet spot)
- place the cabinet at one end of the room...away from corners
- If the room has a sloping ceiling place the amp at the "short end"
This works because the cycle of a A440 note is about 5' and when the "note" hits the diffuser after one cycle it is bounced off and back toward the mic and ceiling to create a spacious effect.
Please note this is a MUCH simplified explanation of the principals...
It's a cool sound.
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