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Hello, there are two options. You could use a mini jack and plug it into your headphone jack on your Ipod and plug the other end into the aux jack on the front of your JVC unit. However you would have to have access to the ipod to control tracks and it will not charge the ipod. Or you could purchase a ipod cable that would not only charge but you would be able to control the ipod from the JVC unit. The part # KSU30 Crutchfield.com sells it for 39.99.
You set the factory radio to a set level, then use the volume on the EQ for everyday adjustments.
I believe your problem lies in the amplification.
Your BOSE amplifier was made to run a 4 channel 8ohm stero load.
Low powered - high in sound quality.
You have swapped the factory 8 ohm speakers (15W) for 4 ohm power hungry ones.
Now the amplifier is working harder to produce the same output.
You would be best served eliminating the factory amplifier and getting 1 good 4 or 5 channel amp to power your speakers.
a 4 channel amplifier could be used stereo (left and right) on channels 1 and 2, (2ohm stereo load)
and bridge channels 3 and 4 for your subwoofer.
For a true surround sound - a 5 channel amplifier could run each speaker individually, and the 5th channel is reserved for the subwoofer.
a small dedicated 75wx4 channel amplifier with built in crossover, and level gain controls - would blow your socks off. It is 200x better than the factory 12Watt amplifier. Your ears will love you for it :D
If you need more help - just let me know.
Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.
If there's only a single sub-out RCA cable, you have two options. The amp may have a manual switch that puts it in Mono mode, in which case you only use 1 of the 2 RCA jacks. The other option is to go get an RCA splitter. This will take your single sub-out cable and feed the exact same signal to both left/right of your amp. Either way, you get the same result. If the 1200W amp is for your sub(s) only, you should set the high-pass filter and subsonic filters to help your bass "hit harder" and cleaner.
The nav feature is purchased separatly with the deck, the previous owner did not purchase it because at the time alpine was charging an extra $1000 on top of the price of the deck to add nav. This is due to the fact that alpine decided to use there own reasearch and development team to design a nav system where as kenwood baught the rights to use garmin's technology and put there name on it which they only charge $400 on top of the price of head unit to add nav.
If by saying amp outputs you are refering to the RCA jacks on back of the head unit (Left and Right RCA jacks usually labeled FRONT, REAR, SUB, etc...) then you do have options even if your head unit doesn't provide a SUB channel. These RCA jacks/amp outputs carry the signal (music or whatever) at a lower voltage (and is typically more like DC voltage as there is a ground reference which is 0 volts and signal rides on the positive voltage), providing a cleaner signal to the amp which does all the work. The wires behind the amp that you connect directly to the speakers is typically amplified by the head unit itself and is a much higher voltage level and varies from negative to positive ( AC voltage.).
You could use the other channels (FRONT or REAR) if available, (a specific SUB amp output cuts all the higher frequencies out, passing just the lower subwofer frequencies inside the head unit).
if you want to strive for a more efficient use of your sub, use a low-pass/SUBwoffer filter (a crossover) in between the Head unit and amp, thus providing the amp with subwoffer signal, (or if for some odd reason you have SPEAKER level sub connections you can use a line output converter which will let you run RCA to the amp.)
Hope this helps u understand why I couldn't just say get a new stereo nor could I just say use splitters on available amp outs.
Depending on the model, if there is a "subwoofer" pre out and yu want subs, use that one. If not and you want it for a sub amp, use the rears, leaving the frints open in case you ever want to hook up an amp for your mids and highs.