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!
An expert who has achieved level 3 by getting 1000 points
An expert that got 10 achievements.
An expert that got 5 achievements.
An expert whose answer got voted for 100 times.
Re: RCA cable use
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.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
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.
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.
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.
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.
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.
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.
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.