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kev88
02-20-2009, 09:57 AM
Searched and couldn't find a clear answer to this - probably because it's common knowledge :o

I installed a JL M2250 powering my two tower speakers last year - followed the installation instrutions specifically and everything works beautifully. I now want to add a JL M1700 and a JL subwoofer. Question - since I already have an amp driving my tower speakers, what do the pre-amp jacks do for me when adding another amp? I am sure I could install the sub amp just like the other and it would be fine.....

Also I want to mount the subwoofer in the stock X-2 location behind the drivers seat. Does the factory use any additional bracing for this, or is it held by the gel/glass only?

Thanks in advance

brucemac
02-20-2009, 10:26 AM
the 2250 has a pre-amp pass-through so you just "daisy chain" the two amps together. no y-cables, no splitters, etc. piece of cake.

not sure about backing for the sub. someone else will chime in soon. good luck with the upgrade!

kev88
02-20-2009, 01:49 PM
Thanks Brucemac

I am assuming I still have to power the sub amp from the battery - or does the pre-out take care of this too?

brucemac
02-20-2009, 02:21 PM
Thanks Brucemac

I am assuming I still have to power the sub amp from the battery - or does the pre-out take care of this too?

no, you have to supply power and ground as well as a remote wire for the new amp. the preamp is simply the line level audio signal. the remote wire (typically blue) comes out of the HU and tells your amp(s) to turn on. typically, the HU remote wire can be split twice (two amps). anything more than that and it is recommended that you use a relay so that the amps receive the proper voltage required to signal turn on.

be sure to read the manual for proper gauge wire to use for power and ground. remote wire is typically 16 gauge.

flipper
02-20-2009, 02:29 PM
Put in a distribution block for the power, and one for the ground instead of running everything to the battery.

brucemac
02-20-2009, 02:31 PM
Put in a distribution block for the power, and one for the ground instead of running everything to the battery.

yeah good point. i bought mine here:

www.darvex.com

kev88
02-20-2009, 02:41 PM
Outstanding - thanks!