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Amplifier Problem My amp is suddenly only sending signal to one of the speaker cable outputs. I have tried swapping cables & speakers around and this is definitely the problem. I have opened the amp up and there are no lose connections. Any ideas? Thanks, Dan

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Ok, I've seen this with panasonic, what brand do you have, to look for a problem unplug the amp turn the amp downword, open the butom cover, at were the back panel is, look for cold solder joint, if everything seem's ok then troubleshoot the ouput stage.

You will need the schematic for this, or go on goolges with the output ic # this will help to tell you what it is,

Regards

Bob the builder.

Posted on Feb 08, 2008

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Suddenly right channel stopped working, could it be a fuse?


I doubt it is a fuse, but it could be 100 different issues. This is not a DIY repair. If you would like to inquire about repairing your Marantz, please visit my website at audioserviceclinic.com. You may contact me there,

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Want to connect more speakers


Use splitter cables to double your outputs. The signal strength will be half to each speaker per channel. i.e. if each channel has an output of 100w then splitter cables will give you 4 x 50w to connect up. Aim to use speakers rated below the max output rating of your amp, so in this example 4 x 40w speakers would be safer (won't blow your amp) than 4 x 60w speakers

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Rear left speaker wont work


Try swapping speakers...the rear one is probably blown out.

Dec 30, 2013 | Panasonic Audio Players & Recorders

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NAD C320. Only one channel sounds. Problem with the volume control?


Did you try to switch the loudspeakers? Before changing anything always lover the volume and switch off the amplifier.
Assuming you tested already different inputs, you can be sure no cable from signal source is out or defect. (or did you nit check that first?).
When the amp is switched off, disconnect the speakers and switch left to right and right to the left output.. If the other speaker is quiet now, you are sure it is in the amp. Still his can be anything.
You can check the connections between the pre and main amplifier on the back side. When you have an extra set of interlink cables, perhaps you can cross the in and output there too. Take care every time you change something, lower the voltage and switch off the amplifier. Sudden clicks when switching on or changing anything can damage the amp and or the speakers.

Perhaps when you checked this you can locate where the problem is? Speaker, speaker cable, power amp, pre amp, (only a part of the pre amp.

Nov 12, 2013 | NAD C320 2-Channel Amplifier

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Have a pair of Cyrus 781 speakers and would like to use the output of a Flat screen TV or Blue Ray Player. What type of cable can I use?


Unfortunately, you can't just hook those speakers to your TV or DVD player. Those devices only offer "line-level" audio outputs that aren't strong enough to drive loudspeakers directly. Those outputs are meant to be fed into the inputs of an amplifier of some kind, and then the speakers are driven by the amplifier.

On some TV sets there may be an external speaker connector, but the amplifier isn't meant to drive serious speakers. The manufacturers intend those to be used with optional soundbars or speakers they want to sell you. Use them with "real" speakers and you might wind up damaging the amplifier over time.

So the real answer to your question is "no kind of cable". If you do get an amp or home theater receiver, you'll need audio cables with RCA plugs from the sources to the amp, and regular speaker cable (18-gauge, and don't waste your money on "Monster Cable"!!) from the amp to the speakers.

Dec 17, 2010 | Audio Players & Recorders

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When I hook up the speakers in the back to the left and right side for the in and out, do I connect the front or rear speakers. do the speakers connect to the subwoofer first then to my receiver or the...


I was trying to find an owner's manual or picture of the rear panel of the sub, but had no luck. The subwoofer is a powered type - or "active" speaker. This means it has a built in amplifier. These active subs usually provide for one or both "low level" and "high level" inputs. Low level signals are usually carried by shielded coaxial cables and have RCA type plugs on the end. The low level is also called "line level". This is an un-amplified signal that might be heard on cheap earphones - but that's about it. It is similar to the output of a tape deck, DVD or phonograph. These signals require an amplifier to be heard. If you have a sub woofer output on your receiver or amplifier, you could run a patch cable between the low level input on the subwoofer and the subwoofer output of the amp or receiver. You receiver or amp may call this output "low frequency effects" or similar. The front and rear speakers would then connect directly to the receiver or amp's corresponding connections.

If you lack low level outputs on the amp or subwoofer, you'll need to run speaker wires from the amplifier or receiver's front left and right speaker output terminals to the subwoofer's high level input terminals. High level signals are speaker connections or amplified signals. These are typically connections that accept bare wire connections. The front speakers would then connect to the subwoofer's front left and right speaker output terminals. The rear speakers connect to the amplifier.

I hope this helps - and good luck!

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MTX Thunder 3401 not responding. Lit but no sound.


turn down music open sub box and put another speaker at wire and check again if work means sub is ok if not check the signal cable, and put there the speaker to try signal

Apr 05, 2010 | MTX Thunder 3401 Car Audio Amplifier

1 Answer

What to do


Hello dodgeram1980,

If you are not getting sound from any of the 4 channels, I'd suspect that either the amp is not getting an input signal or the amp itself is faulty.

Here's the "no sound" troubleshooting step-by-step procedure from the JL manual:

1) Check the input signal using an AC voltmeter to measure the
voltage from the source unit while an appropriate test tone is
played through the source unit (disconnect the input cables
from the amplifier prior to this test). The frequency used should be in the range that is to be amplified by the amplifier (example; 50 Hz for a sub bass application or 1 kHz for a full range / high-pass application). A steady, sufficient voltage (between 200mV and 5.O-volts) should be present at the output of the signal cables.

2) Check the output of the amplifier. Using the procedure explained
in the previous check item (after plugging the input cables back into the amplifier) test for output at the speaker outputs of the amplifier. Unless you enjoy test tones at high levels, it is a good idea to remove the Speaker Connector Plugs from the amplifier while doing this. Turn the volume up approximately half way. 5V or more should be measured at the speaker outputs. This output level can vary greatly between amplifiers but it should not be in the millivolt range with the source unit at half volume. If you are reading
sufficient voltage, check your speaker connections as explained below.

3) Check to ensure that the speaker wires are making a good
connection with the metal inside the Speaker Connector Plugs. The speaker wire connectors are designed to accept up to 12 AWG wire. Make sure to strip the wire to allow for a sufficient connection with the metal inside each terminal.

Hope this helps.

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Pioneer gm-5000t amp


If the amplifier is powering, but no sound, try disconnecting the speaker outputs from the amplifier and connecting a test speaker to the output channel. If you get sound, then one of the speakers in the car may be bad or shorted out. That can be confirmed with a voltmeter. If still no sound, then you need to check the input to the amplifier. Disconnecting the RCA cable from the input and testing that with an amplified speaker like you can get from Radio Shack will allow you to make sure that the amp is getting signal from your radio.

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if you did test for your cable and speaker and you find it fine-your problem will be in output stage of your amp and needs aid of service center.

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