How to connect headphones

Not that i know of BUT you can get a hearing impaired device that connect to your phone that has a loud ringer and or flashing light.

where is the other end of your amplifier connected? To a computer, to a phone?
Did you connect correctly the mircophone to your amplifier and from your amplifier to the correct plug?

Get some headphones Acer in known for only 1 speaker

Hi,
First you need to make a test to adjust your headphones wireless system..
.pls follow the step below:

• "Connect the headphone base" TO " headphones output of TV" with 3.5mm stereo headphone jack cable (than Tv should mute ) Infra red headphone pilot lamp should flicker in parallel to voice coming from TV

• Infra red headphone should have a rotary adjustment on it.. "Volume" adjustment
  
• while TV talking , when you sit in front of the Infra red headphone (it works point-to-point ) you will hear the voice of TV, than adjust volume properly...Thats it..now lets go to second step..
  
• Your headphone's Base should either "3.5mm stereo headphone jack" or "RCA Stereo jacks" or "bot"h..After completion of this test ,I recommend you to switch / use "RCA Audio output plugs-white/Red cable " on the back of TV instead of TV's headphone output ,since it mutes the whole sound..RCA output plugs of TV work independently from the TV's master volume control..of course you need RCA cable to connect this..
  

Hope this helps!..if more help requires pls let me know.
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hook it to the headphone jack on the front of the cpu

Here's the troubleshooting from the manual:

• Make sure voice tube positioned properly
• Voice tube is not clogged (remove tube and see if works)
• Verify transmit volume control of amplifier is set properly

Couple other suggestions to try:

• Reseat all connections to make sure firm connection
• Look for any other volume controls

Link to manual for headset:
http://www.plantronics.com/media/media_resources/literature/user_guides/supraplus_ug_en_fr.pdf

That's because they are using their speakers to lesson to you. If you both use headphones then you won't get the echo. Also you can have them try to lower the volume at their end.
Hope this helps.

Find the Audio card of you computer. Mostly audio card jack had label line out or audio. Also audio out jack was light green in color.

I am not familiar with this particular player, but this problem is usually caused by the headphone socket ground connection,

If the ground connection is lost then the right channel grounds through the left and vice versa.

If you can dismantle the player, check and re-solder the headphone connections. If this doesn't work solder a thin wire to a ground point on the PCB, then touch this to each connection of the socket in turn until the sound is restored. Solder the wire to this connection, and re-assemble the player.

WARNING : make sure that you have made the connection to ground. A live connection could damage the player.

yeah... You need the 8120 pearl for that feature.. I am guessing you have an 8100?