Radio Shack used to offer an unbalanced RCA-to-mini-phone TS cable with a built-in pad (attenuator) for this scenario, but couldn't find it on thier web site. Also, there would not be transformer isolation, opening the door for hum scenarios.
The
passive direct box solution is a resourceful and economical idea that accomodates the need for transformer isolation, ground lift switching and line-to-mic level conversion. (Thanks, Derek)
So, permit me to summarize: The output of the console is -10dB unbalanced (1/4" phone) and the camcorder (mini-phone TS) is looking for around -50dB unbalanced. The disparity between the -10dB console output and the -50dB camcorder sensitivity resulted in overdriving and distortion. The Aux4 output needs to be connected to the 1/4" phone jack of a passive direct box, and create a cable with the following connections for the direct box-to-camcorder mic input:
XLR pin3 to mini-phone sleeve
XLR pin2 to mini-phone tip
small jumper wire between XLR pin1 to XLR pin 3 (mini-phone sleeve)
XLR case tab - no connection
If hum results on camcorder, flip the direct box Ground Lift switch to the opposite position. Or, if there is not a switch on the direct box, snip/unsolder the XLR pin1 jumper.
Like Scott, I have been using a
Beachtek interface box for years and prefer it to work-arounds for a number of reasons:
- The box is ready to go out of the box and does not require the fabrication of custom cables.
- The box mechanically fits between the tripod and camcorder so it won't get accidentally unplugged. (If I had a nickel for every time a 1/4" phone plug got accidentally jerked out of the jack...)
- The box will accommodate XLR mic and line level inputs with the flip of a switch, can also supply phantom power for condenser mics should the need arise, and has Ground Lift switch, capable of instantly eliminating hum.
- Current offerings include an L.E.D VU meter, so you can see overdriving peaks easier.