Hello..I installed a new head unit,alpine cda 9886 with two rear alpine 5.25 in a jeep wranglers roll bar.I bridged the speakers with an alpine mrp-250.the right speaker sounds great,but the left barely has anything emmitting from it.I double checked all the connections and even flipped the speaker connections with the same result...any suggestions..crutchfield thinks i have a bad amp...
Hey whats up bud i got an ALPINE V-POWER MRP-M350 these amps are great go to a walmart od any music shop buy a set of R.C.A cables that plug into your amp than that Ys off to a single connection its a male cable that run a set from the back of your cd player heres the trick ONLY PLUG YOUR BLACK COLORED RCA INTO HEAD UNIT MAKE SURE YOU RAP THE RED ONE WITH TAPE OR GET A RUBBER CAP TO PUT OVER IT SO YOU DONT GET ANY STATIC FREQUENCIES COMING OUT OF THE RED ONE THAN RUN THAT SET TO YOUR AMPLIFIER AND AGAIN ONLY TIE INTO THE LEFT CHANNEL OF YOUR AMPLIFIER.... Hope you know wnat i mean by that Y adapter ther is 2 prongs that tie into amplifier than it splits into 1 were your rca cables will plug into just that one thats how you bridge these confusing amps.... TRUST ME BOTH SUBS WILL SLAM HARD I RUN 2 JL AUDIO OFF OF MINE NO PROBLEM.... WRITE BACK TO ME IF YOU HAVE ANY PROBLEMS OR WHEN YOU GET IT HOOKED UP MY EMAIL ADDRESS IS email@example.com hope to hear from you soon...
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The amp needs an RCA input to communicate with the head unit. SOLDER the wires that come out of the head unit for the front speakers to the SNI-15, making sure that the polarity and right/left is correct. Do this for the front and rear speakers if you have a 4 channel amp. Cut the wires if you add new speakers and run the new wire from the speakers or sub box directly to the amp, or skin back the wire insulation and tap on if you use the factory speakers :( then plug your RCA cable from the SNI-15 to the input side of the amp. Don't forget that most new cars have their own amp so you might have to locate it and bypass the speakers wires around it. Don't make a mess in case you have to put everything back to factory for resale. You can avoid all this by installing a new/modern head unit with built in RCA outputs for front, rear, and sub woofer. I hope this helps. Ray
You would want to bridge 2 of the left channels and 2 of the right channels, essentially combining the power output of the amp.
This article should help you out: http://knowledge.sonicelectronix.com/car-audio-and-video/car-amplifiers/how-to-bridge-an-amplifier.html
Essentially you will just be using 2 channels (left, right) instead of 4 (front left, front right, rear left, rear right) essentially combining the power of those outputs. You'll want to check the amp to see if it tells you which of the outputs should be used for the "bridged" method.
you cannot bridge them together. if they are bridgeable, you can bridge one amp to one speaker and the other amp to the other speaker. make sure not to go lower than the required ohm for each amp. also, you probably will get a different output wattage for each amp.
The Alpine MRP-F240 is a 4-channel amp that outputs 40 watts RMS per channel. It is more suited for powering normal speakers, but since it is bridgeable, you could power a small sub by bridging 2 of the channels.
If you have tried different amps and different subs with the same result, I'd definitely suspect that you are not getting enough of an output signal from the head unit. Checking the RCA's and perhaps using a different set of preamp outs would be a good idea.
One other possibility that you may not have considered is to check the phasing. I've run into speakers that had the markings reversed and running the subs out-of-phase on a 4-channel bridged would make a huge difference in the bass.
This should work if channel 3 & 4 are bridged at 4 ohm.
channel 1 should be stable at 2ohm
channel 2 should be stable at 2 ohm
You can hook up the right side speakers together ( + with + and - with - ) . same thing with the left side. this will give you 2 ohm each channel. this will cause your amp to run hot (this might be tuff on the amp). It will give you right (2 speakers) and left ( 2 speakers ), no front and rear adjustement if you need to balance your sound. I think you should be better buying another amp for your sub and take your 4 channels for your 4 car speakers. this amp as a rca output that can feed the other amp ( sub amp ). it is possible to do it.
Well firstly are you using a parametric crossover with your radio and how much rca cables do you have coming you head unit (car radio) if you going to bridge the front up with you rear speakers u wont be able 2 hear the rear speakers try hookinking it up 2 your head unit's front speaker output and have ur rca cable connected to your amp running on your rear output of your head unit by doing this you can use your fader on your head unit to control your front and rear speakers