I've got a JuicedLink DT454 that I've used once or twice. I've sold my 7D and found that I don't really have a need for this great preamp/XLR adapter/AGC disabler. This unit allows you to monitor your audio with it's headphone jack and levels meter, adjust the gain in both left and right channels, defeat the auto gain control found in cameras like the 7D and T2i and attach XLR equipped mics to your camera audio input. It's in awesome condition since it's only been used a handful of times at most and comes with the ring/tip cable. It's easy to use and works well. Selling for $350. shipped to the ConUS.
Now selling for $320!
Here's some tech info on the unit:
JuicedLink DT454 4-Channel DSLR Camera Microphone Preamplifier delivers quality audio to anyone using a DSLR camera for professional video applications. The DT454 features 2 XLR microphone inputs with 48V phantom power, and 12V (power saving mode) phantom power. In addition, a stereo 1/8" (3.5mm) input may be used as an unbalanced microphone input, or camera audio input for playback monitoring.
Its AGC (Automatic Gain Control) feature is manually controlled, and addresses the unstable gain issues that are common in some DSLR cameras. The JuicedLink DT454 features audio controls on the front, a 4-segment LED meter, 9V battery operation, and mounts onto any DSLR camera.
4 Mic Control (2 XLR + 3.5mm Stereo) + Phantom Power + Meter + Headphone + AGC Disabler
4 mic channels (2 XLR, 2 unbalanced)
Low-noise preamplifiers
Meters
4 segment LED (each right/left)
2 sensitvity settings; adjustable
Meters valuable with the new 5DMKII firmware, which does not show meters during recording
AGC Disable (to get better SNR from cameras without manual control)
30dB low-noise typ max gain (single ended, stereo)
Headphone Amplifier
Playback Monitoring
48V Phantom, plus 12V power saving mode
Made in USA
