Question about Sony XM-754HX Car Audio Amplifier

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RCA cable use

Hello, I have two 4- channel amplifiers that I am going to use to power my subwoofers. one 4-channel amp. for one sub. and the other 4-channel amp. for the other sub. I have used RCA Y adapters from the crossover so that I have two RCA cables. one for each amp. what I would like to know is there are the two RCA inputs on the amp. one for the front and the other for the rear. which inputs do I plug into. with one RCA cable what is the best way to plug into the amp. do I use RCA- Y adapters and plug into both channels, left and right, or do I use just the RCA cable and plug into the amp. on the rear (right) and the front (left) inputs. if I just use the single RCA cable, do I plug the RCA cables on both amps. the same way. not sure if that would effect the sound quality. Anyway what is the best combinations that I should use. Thank You!

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You can plug into the left channel and it will feed both the left and right channels.

To confirm that it's feeding both channels, connect the speaker to one channel at a time. With signal fed into the left channel only, you should get sound when you connect the speaker to either channel.

Posted on Apr 19, 2008

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NO BASS!!


1) Check the Subwoofer for continuity - At the subwoofer, one at a time, test the terminals for Continuity using your Digital Multi-Meter; if your DMM doesn't have a Continuity test, use the Resistance, or Ohms, test and check for Resistance in the Subwoofer Coil (be sure to disconnect the subwoofer wiring before performing these tests).
2) If they test out good, hook the wires back up and test the terminals at the terminal cup or at the Amp hookup if you didn’t use a terminal, don't hook it up to the amp yet. Sometimes the wiring inside the box can be a problem if it has come loose, or isn't making a great connection.
3) If you have a Sub or multiple Subs with Dual Voice Coils, or multiple Subs with Single Voice Coils, make sure your wiring is correct by checking here:
http://www.the12volt.com/caraudio/woofer_configurations.asp
4) Make sure there are no Hi-Pass filters, crossovers, or multi Channel switches enabled.
5) Replace your RCA cable/s with known working RCA cable/s from the Source/Head Unit to the Amplifier/s.
6) Check your Head Unit settings; make sure the Bass is turned up and/or the Subwoofer setting is turned On.
7) If you are still getting no or low output, try plugging in an MP3 player or CD player using a headphone to RCA adaptor and check for sound output. If there is still no or low output, your Amplifier outputs are probably burned out.

Jul 18, 2010 | Jl Audio 300/2 Car Audio Amplifier

1 Answer

Can this power a subwoofer and what is the rms wattage


Hello crucible19,

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.

Hope this helps.

Oct 02, 2009 | Alpine MRP-F240 Car Audio Amplifier

1 Answer

No sound coming from subs


You definitely NEED a source signal for the amplifier to amplify!

You should have a Main Power Wire, a Ground Wire, A Remote Turn on Wire, and RCA cables (or hi level speaker wires if your amplifier has them)
and the speaker wires to the subwoofers.

Thanks for using FixYA - a 4 THUMBS rating is appreciated for answering your FREE question.

Aug 30, 2009 | Kenwood Car Amplifiers

1 Answer

Hooking sub up


Hello missywarden,

According to the specifications, the amp is capable of "tri-mode" operation, that is, running normal speakers on the individual channels while also powering a subwoofer in bridged mode.

Your sub needs to be a minimum of 4ohms and should be relatively efficient. I'd look for a sub that has an RMS power range of from about 75 watts up to a maximum of 250 watts.

The sub connects to the leftmost speaker terminal (positive - right channel) and the rightmost speaker terminal (negative - left channel).

It's not going to be a really loud subwoofer. The power is 360 watts RMS which will be shared by the normal speakers and subwoofer.

Hope this helps.

Aug 05, 2009 | Power Acoustik TS620-2 Car Audio Amplifier

1 Answer

Do not have a sub output on receiver /do not know which wire to plug into the amp sub input/5 channel amp /have rca output for front and rear speakers


Hello southernbike,

With a 5-channel amp (stereo L/R front, stereo L/R rear, and subwoofer) you only need the two pair of stereo inputs.

You do not say which brand and model of amp you have, but most have an output configuration similar to the Alpine shown in this link. Connect the front and rear RCA's from your receiver, your vehicle speakers to the respective output terminals, and your subwoofer to the 5th channel terminals.

Hope this helps.

Jul 29, 2009 | Dual Car Amplifiers

1 Answer

Amplifier loads


Hello ronnieyannon,
A single 4 ohm speaker wired to each channel, like you have them wired, presents a 4 ohm load. And it appears that you have them connected properly. The 401s is only stable to 4 ohms when bridged, so if you were to parallel the 2 4 ohm subs in bridged mode, the load would be 2 ohms and the amp would most likely overheat and go into protection.

I'd wire them the way you have them wired.

Each channel of the amp outputs only 100 watts into 4 ohms. That is adequate for regular full-range speakers, component speakers, mid-range drivers, and even some small subs. But it is a little low on power for most subwoofer applications.

Hope this helps.

Apr 22, 2009 | Rockford Fosgate Punch 401S Car Audio...

1 Answer

My left channel input for the rca on my amp is not picking up any signal or powering the subwoofer, both of my rca cables are fine and the connections are correct just the amp will not play the left...


is the gain turned up on the amp, is the sub set to low frequency, maybe your head deck settings have bass/subwoofer off or bal set to front of the car.

Apr 12, 2009 | Cyclone CA2098 Car Amp

1 Answer

Improper function


try hooking up your subwoofers in series. then connecting them bridged to the amplifier. as follows: positive from sub#1 into positive of amplifier left channel.. negative sub#1 into positive sub#2. negative sub#2 into negative amplifier right channel. turn the gain down as this will sound pretty loud.

Jul 13, 2008 | Pioneer Car Amplifier GM-5100T - 2CH 760...

1 Answer

No power output


Set the meter to AC volts and measure the AC voltage on the RCA cables where they plug into the amplifier. The black meter leat will go on the shield ground of the RCA cable. The red lead on the center conductor. You may have to turn the volume up to get a reading on the meter. At high volume, you should read at least one volt but the actual voltage will vary due to the audio signal. If you get no voltage on the RCAs, measure the AC voltage on the input to the LOC. Let me know what you find.

Aug 24, 2007 | Kicker ZX10001 Car Audio Amplifier

3 Answers

USING 1 CHANNEL


I can't find any documentation for your amp; it was made when Jensen was owned by Recoton, and they're no longer in business. With any 4-channel amp, you can't bridge all four channels into a single channel. What you can do, if you're connecting it to a single sub, is to bridge two of the channels into one channel and leave the other two channels unused. It doesn't usually matter which two channels you pick, but some 4-channel amps designate channels 3 and 4 (or rear channels) for the subwoofer. Whichever ones you use should have a "LPF" or "LP" crossover setting available.

Jun 30, 2007 | Jensen A600HLX Car Audio Amplifier

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