Alright so I have a 15" Memphis M3 subwoofer and an Alpine M850 amplifier that I will be wiring this weekend.

So this is how it goes, I have a 4 Gauge Rockford Fosgate amplifier kit installed already-

-Power Cable(Red)-Battery (+) terminal to trunk(Power input of amplifier)
-Ground Cable(Black)-Grounded screw below trunk floor covers to trunk(Ground input of amplifier)
-Remote wire-Fusebox to Remote in amplifier
-Signal wire-Wiring from stock subwoofer to LOC (Line out converter) to amplifier speaker in ports
-Speaker wire from signal out (amplifier) to Subwoofer terminals

Now the problem that I have is that my amplifier(mono amp) is 500rms at 4ohms and 800rms at 2 ohms. The Memphis subwoofer is 400/500rms with dual 4ohm voice coils.

I looked up on Crutchfield and the way it told me to wire it would cause the amp to give a 2ohm load causing it to give out 800rms which is almost double the subwoofer's capability. So I'm thinking of bridging it but I'm not really sure how to do it to give it a 4ohm load. Any help would be appreciated. Thanks!

Extra Info:

# 15" M3 Series Subwoofer
# Power Handling:
# Peak: 1000 watts \\ RMS: 500 watts
# Kevlar reinforced paper cone woofer
# High-density foam surround
# Vented and unique Memphis "M" cast basket
# Removable frame and cone assembly
# 2.5" Black anodized-aluminum dual 4 ohm voice coil former
# 85oz. Magnet
# Sensitivity: 90 dB


Alpine MRP-M850
RMS Power (at 14.4V THD+N, 20Hz-200Hz)
Per channel into 4 ohms: 500W x 1 (0.08% THD)
Per channel into 2 ohms: 800W x 1

 

Fizzle...

You shouldn't have any problems with wiring the sub to the amp per Crutchfield diagram - PARALLEL Wiring...

Remember that Extra Power doesn't blow speakers.... it's Dirty Power that Kills speakers... so Clipping in the signal is a speaker's worst enemy...

Just keep the Gain on the amplifier in the right place/setting (you shouldn't have the gain on your amplier set more than a quarter to half way)... use a test track and a multimeter to determine how much power you're actually giving your speaker... there are great tutorials on the Elemental Design website... link to them thru here http://www..com/forum/showthread.php?t=1732

Your amplifier ground should very good too... to keep the amplifier clean and relitively noise free... so where ever you decide to bolt up the ground wire... Please Grind Away all the paint from that surface...

I tapped into the white wire on the 12V charger - Cigarette plug in the center console (between two front seats) as my remote wire.... it's basically in the ACC Circuit... this circuit is turned on with ignition via a factory relay... and it has a 20 AMP capacity... plus it's not connected to any other electronics in the car... so the extra draw from the amplifier doesn't affect it... Plus it's a much cleaner install... I hate those Add-a-Circuit craps at the fuse box...

Good Luck and happy bumping...