How to hook JL F112 sub to both preamp and pre/pro

A follow-up to my previous post: If you have a multimeter you can easily determine whether or not the unbalanced signal input is connected directly to a balanced signal input.

Disconnect the sub from everything (including power), and for each channel check for continuity between the center pin of the rca input jack and pin 2 of the xlr input connector. If there is no continuity, check for continuity between the center pin of the rca input jack and pin 3 of the xlr input connector.

Regards,
-- Al

It will send signals at the same time, and I am 100% certain the manual is correct, and the tech, don't know the name, at JL Audio told me explictly that you CANNOT send both signals, you have to only have one going at a time, unlike Rel's or Def Technology.

Hi Mac,

Yes, of course you don't want to input two ACTIVE signals at once, given that there is no provision for selecting between them in the sub. If you did, you would hear some highly distorted combination of the two signals.

My comments were addressing the questions of whether DAMAGE would occur in that situation (I don't think it would), and whether or not sonic quality would be compromised in the situation where both inputs are connected but only one input has an active signal on it (I think that sonic quality MIGHT be compromised in that situation, depending on the factors I described).

Best regards,
-- Al