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So i'm looking at adding a sub to my 4 speaker + amp setup to get a little more bass in my 05 jeep liberty. I currently have an Alpine MRP-F300 powering 4 alpine SPS-610 speakers (50W RMS x4) and a alpine CDE-HD138BT headunit. I have 8 gauge power and ground wire with a 60 amp fuse at the battery. I'm looking at purchasing a JL Audio CS110-WXv2 sub and a Rockford Fosgate Prime R250-1D amp (150W RMS). I was wondering about the specifics of wiring this system up, i plan and buying a power distribution block to split the power coming from the battery.
If both the amps have built in fuses, do i need to fuse them after the distribution block? If so what kind of fuses do i need?
Will my 8 gauge power wire be sufficient to run these two amps? According to the cable gauge chart on your website i should be fine with 8 gauge since i'm only at 350W RMS total but i want to be sure. On this same note, will my 60 amp fuse at the battery work as well?
I read somewhere that you can burn out your receiver if you have too many items plugged into its remote turn on lead. Will i be ok splitting the remote turn on wire between the two amps or do i need to buy a relay?
Will i be ok with grounding the amps to the same bolt without using a distribution block?
This will get complicated.
Short answer is it will work and is your best option, but not really recommended. Your recommended options would be re-wiring the car with 4-guage or running a new 8-gauge lead for the RF amp.
8-gauge wiring only supports 60A. The Alpine amp has 50A or fuses and the RF has 25A so you SHOULD HAVE 75A of main wiring. However, the 75A rating is based on running the Alpine bridged (300W), and the RF at 2-ohms (250W). Since you aren't doing that, you will PROBABLY be okay, but you run the risk that if you switched to a 2-ohm sub, you might blow the main fuse.
mattj150If both the amps have built in fuses, do i need to fuse them after the distribution block? If so what kind of fuses do i need?
You fuse to protect the wiring, not the amps - if both leads to the amps will be 8-gauge and you are running 8-gauge at the battery, the 60A main fuse is fine. If you were running 10-gauge wire to the RF amp, you would want a 30A fuse after the D-block. Similarly, if you were running 4-gauge wire at the battery, you would want an 80-125A main fuse and then if you ran 8-gauge wire from the D-block you would want 60A fuses (or smaller) in each leg.
mattj150According to the cable gauge chart on your website i should be fine with 8 gauge since i'm only at 350W RMS total but i want to be sure.
It's not really based on the wattage, it's based on the amperage draw, but Crutchfield probably has an approximate chart somewhere.
mattj150On this same note, will my 60 amp fuse at the battery work as well?
Again - you fuse to protect the wiring - you can't go LARGER than 60A with 8-gauge wiring.
mattj150I read somewhere that you can burn out your receiver if you have too many items plugged into its remote turn on lead. Will i be ok splitting the remote turn on wire between the two amps or do i need to buy a relay?
The general rule is that for less than three amplifiers, you don't NEED a relay. OTOH, it's a safer wiring method and can't hurt anything.
mattj150Will i be ok with grounding the amps to the same bolt without using a distribution block?
Not a fan of grounding blocks, but I've read mixed suggestions on using the same bolt. I'd probably use separate bolts near the amps.
Hope This Helps!!!
Anyone else have suggestions?
2002 Ford Focus JVC KD-A815 Sony CDX-GT410u Sony XT-100HD HD Tuner Stock
speakers, no amp, no subs
I'd say verbatim what Tiger said. Main thing.....defitnatly run 4AWG wire then split to 8AWG, and don't by the cheap wire from WalMart or something, the cheaper power wire is just really thick insulation with minimal copper wiring inside. I run Kicker cable and find it quite high quality for a DIY install.
2007 Jeep Grand Cherokee - Alpine iDA-305SBT w/Imprint; SPR-60C Front; SPR-60 Rear; 2 JL 10w1v2; Alpine PDX-5
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