Hi - really need some help to try to trouble shoot this.
Loud constant thumping noise when I mute the radio or turn the volume down to 0.....sounds like the speakers could blow if left on too long. This happens when I turn on to FM and Bluetooth connection. Also the speakers are making static/hissing noise. Also, makes a popping noise when switching from FM to Bluetooth, USB.....
I have a Camper and the radio is a Jensen JWM22 RV radio that only puts out 6w X 4 ch ..... 2 speakers inside the camper and 2 speakers out side. I’ve connected a small Pioneer GM-D1004 amplifier class D 4 channel RMS of 45w X 4 using high inputs (only option I have). I only connected the 2 outside speakers…..only using 2 of the 4 channels. The other 2 channels are not being used at this time. The 2 speakers I’m using are DS18 ZXI-454 (4x6) with RMS 60w per speaker. The amplifier already has a ground and power wire connected to the wire harness 14 gauge.
I connected a car amplifier to the stereo and it makes static noise that is very noticeable, even when playing music. Without the amplifier it makes very little noise …barely noticeable when the volume is muted. I’ve unconnected and reconnected everything and it still makes the noise. Also, when I turn down the volume to zero or mute the volume it makes a very loud continuous popping and other loud noises until I turn the volume back on. I’ve connected power and ground to the battery and I also tried using a different battery. Also tried connecting the ground to the frame.
Any suggestions on what I could do to fix this?
I would like to add a subwoofer one day for tailgating …my main concern is getting the above fix
Loud constant thumping noise when I mute the radio or turn the volume down to 0.....sounds like the speakers could blow if left on too long. This happens when I turn on to FM and Bluetooth connection. Also the speakers are making static/hissing noise. Also, makes a popping noise when switching from FM to Bluetooth, USB.....
I have a Camper and the radio is a Jensen JWM22 RV radio that only puts out 6w X 4 ch ..... 2 speakers inside the camper and 2 speakers out side. I’ve connected a small Pioneer GM-D1004 amplifier class D 4 channel RMS of 45w X 4 using high inputs (only option I have). I only connected the 2 outside speakers…..only using 2 of the 4 channels. The other 2 channels are not being used at this time. The 2 speakers I’m using are DS18 ZXI-454 (4x6) with RMS 60w per speaker. The amplifier already has a ground and power wire connected to the wire harness 14 gauge.
I connected a car amplifier to the stereo and it makes static noise that is very noticeable, even when playing music. Without the amplifier it makes very little noise …barely noticeable when the volume is muted. I’ve unconnected and reconnected everything and it still makes the noise. Also, when I turn down the volume to zero or mute the volume it makes a very loud continuous popping and other loud noises until I turn the volume back on. I’ve connected power and ground to the battery and I also tried using a different battery. Also tried connecting the ground to the frame.
Any suggestions on what I could do to fix this?
I would like to add a subwoofer one day for tailgating …my main concern is getting the above fix
If both channels are equal, it is probably ground currents. IF one component is sensitive to noise on the DC line, you could also have a problem.
They make transformer isolators for line level audio (RCA). Try a pair of those in various locations to see if you can isolate the problem component.
They make transformer isolators for line level audio (RCA). Try a pair of those in various locations to see if you can isolate the problem component.
If you connect speakers (and only speakers) to the speaker wires that you have driving the speaker level input to the amp, do you get clean audio?
I do not have RCA input for this amp ......would it be fine to splice into the RCA jacks and connect the speakers wire?
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If the amp is made to work at speaker level on the input, I'd use that.
If you connect the head unit to the amplifier's input and also connect the speaker at that point, does the speaker produce clean audio or does it do as described when the head unit is connected to the amp?
If you connect the head unit to the amplifier's input and also connect the speaker at that point, does the speaker produce clean audio or does it do as described when the head unit is connected to the amp?
Perry - So connect the speaker wire from the head unit to the amplifiers input and also have the wire connected to the speaker at the input and the output of the amplifier? Like the 1st image
This is how I connected the HU and speaker wires to the amplifier (2nd image)
Below is the wire diagram from the head unit.
This is how I connected the HU and speaker wires to the amplifier (2nd image)
Below is the wire diagram from the head unit.
Attachments
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Never connect the output of an amplifier directly to the output of another amplifier.
Connect the head unit's speaker wires to the speaker level input of the Pioneer amplifier (as you would normally). At the point where those two connect, connect a speaker with a short wire (not connected to anything else) to the head unit wiring as it would be normally.
What I want to see is if the problem is the connection to the amplifier. If the head unit still does odd things, we'll have to examine output of the head unit and the input to the amp to see if we can make them compatible.
Connect the head unit's speaker wires to the speaker level input of the Pioneer amplifier (as you would normally). At the point where those two connect, connect a speaker with a short wire (not connected to anything else) to the head unit wiring as it would be normally.
What I want to see is if the problem is the connection to the amplifier. If the head unit still does odd things, we'll have to examine output of the head unit and the input to the amp to see if we can make them compatible.
I've hooked up several amps in the past and would never do this. All has been in an automobile and not a camper. Never had any issues like I am having now.
I connected the head unit speaker wire to the speaker level input of the Pioneer amplifier and connected a short wire to a speaker at the same point of contact. I did not notice any noise when playing music from Bluetooth. I did this with with and without the amplifier being on. When I paused the song, I barely heard a noise....I had to put the speaker up to my ear and turn the volume up. There was no noise when I muted the volume.
Hi JT5,
Just to be clear. The speaker output of your head unit goes to the speaker input of your amplifier. Period. The output of your amplifier goes to your speakers. Period. RCA type connections go to RCA type inputs only. Speaker type outputs go to high level (speaker type) inputs only, or through a speaker level adapter to convert to RCA levels.
Many "high power" outputs from head units are actually balanced, so both leads have signal. In addition, they typically sit approximately +7 VDC or so above ground. Tying an output like this to ground or common with the other channel will typically blow the outputs instantly.
That's to start. Don't get fancy or imaginative at this point.
Just so you know, I was authorized warranty for several high end car audio companies in the early days. I've been repairing and installing car audio since it started.
Just to be clear. The speaker output of your head unit goes to the speaker input of your amplifier. Period. The output of your amplifier goes to your speakers. Period. RCA type connections go to RCA type inputs only. Speaker type outputs go to high level (speaker type) inputs only, or through a speaker level adapter to convert to RCA levels.
Many "high power" outputs from head units are actually balanced, so both leads have signal. In addition, they typically sit approximately +7 VDC or so above ground. Tying an output like this to ground or common with the other channel will typically blow the outputs instantly.
That's to start. Don't get fancy or imaginative at this point.
Just so you know, I was authorized warranty for several high end car audio companies in the early days. I've been repairing and installing car audio since it started.
Hi Anatech,
I agree and have always connected the speaker output of the head unit to the speaker input of the amplifier then the output of the amplifier goes to the speakers. I'm not using any RCA cables or adapter at this time.
I appreciate any advise I can get to get this working without the noises. Thanks
I agree and have always connected the speaker output of the head unit to the speaker input of the amplifier then the output of the amplifier goes to the speakers. I'm not using any RCA cables or adapter at this time.
I appreciate any advise I can get to get this working without the noises. Thanks
To clarify, the head unit was working perfectly and playing audio normally while driving the speaker and amplifier input together?
That would mean that the problem is with the amp. Not necessarily a defect, just an incompatibility.
Is there a reason that you could not use the RCA signal for the amp?
Part of the problem may be the auto selection circuit in the amp. Answer the question at the top of this post and we'll continue.
That would mean that the problem is with the amp. Not necessarily a defect, just an incompatibility.
Is there a reason that you could not use the RCA signal for the amp?
Part of the problem may be the auto selection circuit in the amp. Answer the question at the top of this post and we'll continue.
Hi Perry,
Yes the head unit was working fine while playing audio. Only time I heard something was when I paused the song, I barely heard a noise....I had to put the speaker up to my ear and turn the volume up. There was no noise when I muted the volume.
I do not have RCA signal input for the amplifier. Could I convert the speaker input wires from the amplifier to RCA jacks? The radio is 6 watts X 4 Channels with 2 zones. It does have a ground line out right and left. (see post #9)
Picture for the amp input
I have the HPF selected on the amp.
FYI - I used this amplifier in a truck I had a year ago and did not have any issues with it and it was connected to the factory head unit. Which was fine then but I'm now trying to use it with a different head unit which apparently is a problem.
Yes the head unit was working fine while playing audio. Only time I heard something was when I paused the song, I barely heard a noise....I had to put the speaker up to my ear and turn the volume up. There was no noise when I muted the volume.
I do not have RCA signal input for the amplifier. Could I convert the speaker input wires from the amplifier to RCA jacks? The radio is 6 watts X 4 Channels with 2 zones. It does have a ground line out right and left. (see post #9)
Picture for the amp input
I have the HPF selected on the amp.
FYI - I used this amplifier in a truck I had a year ago and did not have any issues with it and it was connected to the factory head unit. Which was fine then but I'm now trying to use it with a different head unit which apparently is a problem.
As Anatech stated, many (most) head units have a balanced output. It's almost unheard-of to have a head unit that doesn't have a balanced/bridged output with 1/2 of the battery voltage on the speaker terminals. I think that may be causing the problem here. That and the way this input is configured. It may be looking for either the 1/2B+ or a shield ground to try to choose the input mode.
Do you read 0 ohms to ground for any of the speaker wires coming out of the head unit (head unit off)?
If so, which ones?
With the head unit on, do you read DC voltage on the speaker output terminals of the head unit? If so, how much?
Do you read 0 ohms to ground for any of the speaker wires coming out of the head unit (head unit off)?
If so, which ones?
With the head unit on, do you read DC voltage on the speaker output terminals of the head unit? If so, how much?
Hi Perry,
Interesting amplifier. Interesting radio, very old?
He may read positive voltage on the hot output leads as they will be capacitor coupled, the charge has to be drained (to charge the coupling capacitor). From the 6W x 4 description, the speaker common leads should return to ground. Need to confirm that.
Hi JT5,
The amp can be converted, but only by a really good technician. Don't do that, I'd just buy a new amp that is better if you want RCA inputs. There are adapters to convert a speaker output to RCA levels without DC.
Interesting amplifier. Interesting radio, very old?
He may read positive voltage on the hot output leads as they will be capacitor coupled, the charge has to be drained (to charge the coupling capacitor). From the 6W x 4 description, the speaker common leads should return to ground. Need to confirm that.
Hi JT5,
The amp can be converted, but only by a really good technician. Don't do that, I'd just buy a new amp that is better if you want RCA inputs. There are adapters to convert a speaker output to RCA levels without DC.