Question about Alpine MRP-F300 Car Audio Amplifier
My subs have very little sound, can't even tell their on unless you put your hand directly on them. The amp is a brand new 4 channel Alpine f-300, that i have bridged for 2 channels. These subs did the same thing with a previous cheap amp. I have the filter set to lp, and i have tried every setting and dial on the amp, none seem to make much if any difference. My head unit does have the subwoofer mode turned on, and i have gone through and adjusted every audio setting on it. They do seem to make a little more noise if i turn the bass all the way up on the head unit, but then my full range speakers distort easily and i can't get much volume out of it. The subs and the amp are both 4 ohm, i even ohmed out the subs and they checked out. I have checked and repositioned my ground. I even tried hooking up other subs and got the same results. All in all i have tested combinations of 3 different amps one of which is brand new, and 4 different subs with all the same result, just a barely audiable beat. The only other thing i can come up with is to pull the head unit and run new RCA's, but since i am getting a tiny bit of sound, i wouldn't think they would be the problem, because that would mean they are sending a signal, like their supposed to. Though other than trying that i'm out of ideas...
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.
Hope this helps.
Posted on May 10, 2009
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Posted on Jan 02, 2017
SOURCE: Alpine mrp-350 amp
1) If you bridge on a non bridged amp your sound will be horrible as they sine waves comming out of the two teminals will be different... I suggest removing the bridge. 2) The gain knob is to adjust when the amp will reach its max volume with respect to the sterio;s volume. 3) the LP filter is a Low Pass filter and its purpose is to eliminate the higher frequencies that do not sound all the well when played over subwoofers.
Posted on Mar 26, 2007
could be low current ,disconnect all power including ground for 20min N.B most amps will seem to be shorted at output but this is normal due to damping ratio.
Posted on Aug 09, 2007
The Kenwood KAC-6202 2-channel is only rated for 60 watts RMS per channel into a 4 ohm load. That just isn't much power for a pair of 12" subs. Even the bridged output is only 200 watts into 4 ohms, still at the low end for a sub, much less to share between a pair of subs.
Assuming that your subs are 4 ohm, you could probably get more sound by driving just one of them on the bridged terminals. But to get the best power with what you have, connect one sub to each channel, set the filter switch to the far right (LPF), set the operation switch to stereo (both channels driven), set the filter frequency (Hz) to 100 or lower, and adjust the input sensitivity as far clockwise as possible without causing distortion.
But, to do the subs justice, you really need at least 300-400 watts to share between them.
Hope this helps.
Posted on Sep 27, 2009
Posted on Oct 19, 2009
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Whats the condition of your amplifier? New , Used, Old?
You might have a blown channel off your amplifier, this may cause little or no sound. You will have some distortion, crackle sound and then maybe nothing at all. What kind of subs are you running to it? Make sure the subs arent blown and check the voice coils to see that they are not torn off the subs , these are the 2 little silver or copper wires that are connected from the speaker connectors to the sub itself.
Let me know what happens?
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