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Mcfarlow amp-300 sound only coming out of one channel (left hand side)

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Mc farlow 300 amp does it have fuses for channels .no  sound coming out

Posted on Feb 14, 2010

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How can you bridge a 2 channel 300 watt amp to a 4 channel 300 watt car amp?


if you have (4) 4 ohm speakers (No Subs), then you simply take the (2) positives from the two right speakers, and the (2) negatives together and put them on the right output of the amp. Do the same for the other side. This will have the amp at a 2 ohm stereo load on each side, which will max out the power of the amp. Will sound great with any small power amp.

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I have the xp 300 and in stereo mode it only works on one channel or the other, not as 2 seperate channels


If you are saying that it only works on say the left channel in stereo mode, but both channels come on in mono, then there's a fault in the amplifier's pre-amp. These days they are an IC, it can be traced by following the input wires to the point on the PC Board and then looking around for an IC with all inputs going in. If you are lucky there might be two! One for each channel. Replace the one on the dead channel. You can test it, either the single IC or both, touching it's pins with an insulated tool while the amp is on. It will buzz on the channel. Stereo amps have two sets of identical parts, except when an IC is involved. But even then that will have two halves (inside it). You just need to touch the pins of the IC, with the tool, but don't short the pins together! You should hear at least 4 buzzers. One at the right input, one at the left input, one each at the left and right output. If you only get the left an right output buzz, plus the good channel input buzz, you know it's the IC that's gone.

Mar 29, 2011 | Gem Sound GemSound PA-585 2-Channel...

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Sound only from left side speakers!


If you put the good channel from the deck into the right and then left phono imputs of your amp, the sound should come out from the left and right speakers. If it only comes out from the left, then the amp as a right hand channel fault. Now if other devices work on both channels, then it's the pre-amp for the phono socket that has a fault on it. You should be able to find this by following the wires from the phono socket. If you touch around that pre-amp you should get it to buzz on either channel (where it joins with the main pre-amp). Doing this with a screwdriver will pin-point where the faulty part is (working backwards). PS don't short anything by touching to bits of metal together with the screwdriver.
Magnetic cartridges need a small pre-amp before they can be past to the main pre-amp. That's why you can't hear anything with the deck plugged into another line socket.
If you get signal on both left and right speakers with the above test the deck is to blame.

Jan 11, 2010 | Sony PS-LX300USB Turntable

1 Answer

Hi i have an audio source 300 watt amp with a&b speaker outputs. the problem is that no sound comes from the left side outputs a or b. the right side works fine thank you mike


You have a blown channel. If you are experienced with electronics repair, use the right channel to assist in diagnosing the left. Both channels should be efectively identical. In most cases, the defective parts are the output transistors. You should be able to A/B the output amp sections.

Let me know if you need further assistance.
Dan

Jan 14, 2009 | Audio Players & Recorders

1 Answer

Muffled/bad sound on 1 channel of Marantz PM4400 amplifier


Go directly to the main amp, follow the leads from the speaker terminals. And you should find something on an heatsink. If there are two transistors see if they are running hotter than the other channel. If you see any damage to them (compare with good channel) replace both!
If all you see is a black box with pins coming out of it you need to replace that. They sometimes have the letters STK on them.
Replace both types with the letters and numbers of the same type. IE 2SC 1220 or STK 589.

Dec 17, 2008 | Audio Players & Recorders

1 Answer

Sound through one channel only.....NAD 310 Amplifier


If swapping of left and right input sources and left and right speakers does not help...you might have a bad channel in your amp.

Sep 24, 2008 | NAD Audio Players & Recorders

1 Answer

Sound through one channel


Only the right channel had a sound,the left channel is mute, whatever adjustment you did and whatever balancing you done nothigs happen,even you interchange the speakers. The problem is in the power amp. The STK IC there is busted already, it's better to change it with a new one so the performance become normal again.

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1 Answer

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If both the left front and left rear channels are out, reverse the RCA cables to determine if the problem is signal related. If the left side plays when you reverse the RCA cables, reverse them at the head unit to see if the audio changes sides. If it does, the head unit is likely the problem. If it doesn't switch sides when you switch at the head unit, the RCA cables are the problem.

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Did you ever find the solution to the left channel issue? I have the same problem with mine.

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Left Front Channel Goes in and Out


left channel there is a problem use a tester to locate the bad transistor

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