my new HU only seems to have a mono sub out. There are normal left right termanls for the front and rear. should i just use those for my sub????

 

Im so confused by your post.. so you only have a sub output but you want to use the front and rear outputs that dont exist for the sub?

 

nevermind, I figured it out reading the thread title...

what kind of amp are you using that it doesnt have RCA inputs?

 

i only have a single mono sub out. there are no + - outs for the sub. The HU does have some extra outs for normal speakers which are +-. im puzzled

 

the issuse lies with the HU's outputting

 

so the sub preout doesnt have a red and white output? weird. reminds of the HT sub preouts where it only has one output...

are you missing any sort of adapter that makes the one output into two. when I had my Pioneer HU, it was advertised as F/R/S preouts but one of the preouts was simply a dinky adapter that hung from the HU and allowed you to plug in a 3rd set of RCA's.

Specific info on your equipment might help...

 

Its tyhe JVC Exad kw-avx706

 

hmmm, I read the info on it @ crutchfield and indeed, it says that it only comes with 1 output for sub....

I honestly dont know what to tell you... sorry

 

if u use one of those RCA adapters to run ur sub off a stock deck, dont u have to tap into normal left/right outs??? im thinkin i may just be able to use the rear left and rights to go to my amp

 

get an RCA Y adapter cable that is 1 male to 2 female plugs... voila - 2 rca's....

 

i was wonderin if i could do that. ill get one later. for now the sub is running off the RCA adapter i had to use for my stock deck

 

Here is one on ebay

http://cgi.ebay.com/10-Y-Cables-1-RC...QQcmdZViewItem

 

A single sub only requires one RCA cable if it it run on a mono amp. If you wire a two channel amp down to one chanel you should only need one input. When you have a pair of RCA cables the red and white are not positive/negative. Both colors have a positve and negative. The male post on the RCA end is the positve and the "shield" around the post is the negative. Depending on how many subs you are running and the wirining configuration you chose for the sub(s) you souldn't need the Y adapter. You can wire the sub/subs at different ohm levels and you should be able to use only one "mono" RCA cable.
I've always found Y adapters to lower the sound quality.

 

Not that I'm expert, but I think that if you're using a mono sub amp, you don't need a y adapter, even if the amp has left and right inputs- the signals would be combined by the amp's circuitry into a mono signal, anyway. I suspect it would be the same using a stereo amp in bridged mode, too...

Amps and HU's usually have pretty good manuals- even if you bought the equipment used, the manuals can often be found online...

 

A mono amp may require both inputs to get an adequate signal level. It just depends on the design of the amp. I have a home sub amp that doesn't do much with just one input so I put a Y adapter on it and it made a world of difference.

Also check Radio Shack or some other electronics shop if you look for a Y adapter. That price on Ebay including shipping is way too much.