Hi Paul,
Of cameras in the the HD7 price range, I would take the Canon HV20/HV30 over the JVC or any other alternatives. The HD7’s low light performance is abysmal, its image is noisy, color come out very artificial and the TOD files can be a nightmare to bring in to an NLE. The only advantages of the JVC, apart from looks, are having a proper focus ring and focus assist. Otherwise, there is little to recommend the camera. And the Canon has headphone out, a miracle on consumer camcorders these days!
If you do still choose the camera, or any other lacking a headphone jack, there is a workaround:
a stereo level meter to amplify the signal*
and
an RCA to mini adaptor to connect the RCA audio out cables from the camera to the level meter**
Otherwise you can connect headphones directly to the RCA line out, but chance are the levels will be too low to be useful.
Best,
Peter
In case my HTML doesn’t work, here are B&H SKU’s for the parts you’ll need:
*SIVU150
**HOYCSMM2RF
Just go to bhphotovideo.com and enter the SKU’s in the search field.