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Re: The headphone socket
When you move the headphone plug around and the sound cuts in and out that usually means that the terminals in the jack have corrosion on them. You can usually clean the jack with contact cleaner that is sold in home improvement stores.
Here's a video showing how to clean the headphone jack on a phone but the process is the same for any device that uses a headphone.
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Some amps have a button which you press to mute the speakers when the headphones are plugged in. Sometimes marked "Speakers on off". If it hasn't then a new headphone socket would not be expensive to fit. As long as the amp producers sound I don't see any future problems. The previous owner may have used the headphone socket a lot, and simply wore it out!
The headphone socket in the GoGear is faulty. If you can hear sounds from both ear pieces when you wriggle the headphone plug in the GoGear, then the headphone socket in the GoGear is faulty. This fault can be easily fixed by removing the circuit board in the GoGear and resoldering the headphone socket to the circuit. You need a very fine tipped temperature soldering iron to do this job.
If your speakers work fine when plugged into the headphones socket on the front of the system, then there is no fault with them. If the sound through the speakers is very low when plugged into the rear panel socket, that would suggest that you may be plugged into the line out socket rather than the speaker socket and that there is a mismatch of the impedence between the socket and speakers. If you have three audio sockets on the rear panel, try the speakers in the second output socket (but not in the microphone socket) and see if it makes a difference. You could try the same test using the headphones - do you still get good sound levels with the headphones when plugged in to the rear panel socket? If neither the speakers nor headphones give good sound when plugged in to the rear panel, then you may have a problem with either the sound card if the sockets are on a separate PCI card, or with a poor connection on the cable to the socket header bracket from the motherboard pins for audio for integrated adapters.
1) You are turning up the volume too much. Headphones, especially non-top of the line headphones, are not meant to be listened to at very loud levels. In this case, the crackling you are hearing is the speaker trying to reproduce a bass sound that is "clipping", or exceeding the maximum output level for that system. Remember - headphone speakers are very small; they have a harder time producing low sounds accurately. The solution is to just turn them down a little. 2) Assuming problem 1 is not the problem, the other likely issue is that they came with some sort of mechanical defect built in. If you are not playing them loudly, but you are still getting a crackle, especially if it is only on one speaker, they probably are broken. It is probably the jack itself, or the wiring leading up to the earpieces. Either way, it is not a terribly hard fix if you have some electrical know-how, but if you don't, there are plenty of people who can rewire them for much cheaper than it would be to buy a new set. However, if this has been happening since you got them, I would call the manufacturer first and see if they will replace them. Sennheiser tends to pride themselves in the quality of their equipment, so I would not be surprised if they sent you a replacement set. Hope this helps!
The headphones socket is on the preamp stage - it works so the problem must be after the pre-amp.
Do you get any sound at all from the speakers (hiss or perhaps a click) when you turn it on?
If yes it is an amplifier problem.
Here are some possible causes
A wire has come off the loudspeaker - easy to fix
Speaker protection fuse has blown - small glass fuse mounted on main amplifier chassis - replace with correct rated and type of fuse (note some of these are 'slow' blow type - important that you get the right one)
faulty component in the main amplifier stage - requires attention from qualified repairer
Loudspeaker burnt out - this can be tested by connecting another speaker across the terminals of the built in speaker.
The headphone jack socket automatically disconnects the loudspeaker when phones are plugged in - it could be that the contact in the headphone jack socket is bent and not re-making contact when the headphones are unplugged.
First check the cable and plug they can very easily break. Sometimes bending and flexing can cause the sound to appear. Try this all over right to where the cable joins the headphones. The only other problem it can be is a failure of the speaker. UNLESS there's a volume control or a switch in the cable or on the phones themselves. These can break or get dirt on the contacts cutting sound off.
PS Make certain they don't work in other amps first, headphone sockets can breakdown too!
If you find it is the plug, you can cutt it off and fit a new one if your any good with a soldering iron. The cable is much harder as you would need to get into the headphones to replace it. If the speaker has gone you would need to order one from Beyerdynamic.
Dirt can be cleaned out with Servisol Switch Cleaner.