They all say that they are hifi and tv use headphones, and I only found 1 that says "pc", but are there headphones that work for pc and do NOT go around the neck?

If it says it will work for tv, chances are it uses component, if it uses the regular headphone connector than it will work for pc, if it uses the component connnectors, just take it to radio shack and tell them you need to adapt it to pc, they will know what adapter to give you

go ahead and buy any pair of headpones you want, here is the adapter you will need:

http://www.amazon.com/Belkin-Pro-Audio-Mini-phone-Stereo/dp/B0007A3J8S/ref=sr_1_10/002-4159851-9204009?ie=UTF8&s=electronics&qid=1189840878&sr=8-10

What can I do (if anything) to improve the bass in by Sennheiser HD555 headphones? Will buying a headphone amp help? If so, any recommendations?

Some amps help some not. If you have the newer 555s(50ohm) they can be easily powered by most devices. Keep in mind that the 555s are not bass heavy cans and most consumer amps will just make them louder but the bass will remain the same. I’ve gotten the best bass out of them through audio receivers.

the headphones are from Triton and have a mic built in. I got the mic to work so I can talk and people hear me, but there is still no sound. Is there someplace I can download a driver the PS3 will recognize? maybe some other fix?

u cant use PC earphones for the PS3 u have to buy ones that r for the PS3.

I have a science project on how headphones cause acoustic trauma when up to loud and how they cause you to go deaf but I need to know how it all works. So how do headphones work and I also need to know how speakers amplify as well.

The quick answer is that the electric current that travels through the speaker wires is converted into sound waves via the speaker cone (the round part of the speaker that pulsates. If the speaker cone did not pulsate, there would be no sound. (As all sound is caused by the vibration of air molecules)
Your ears operate on the opposite principle; air molecules introduce sound waves to you eardrum, which sends those waves ultimately to your brain which decodes the information as sound. Too many decibels can permanently hurt the workings of you inner ear. (Simply place. The process really goes through some other steps that time will not permit me to clarify) but . . . .

Here’s the site you want to check out: www.howstuffworks.com . It’s a really cool site that’ll tell you pretty much everything you want to know about stuff. (Earphones have speakers in them, so you might want to type in "speakers" for a search term) And you can also look up how ears work too!

Hope this helps.

I have a PSP which I use to listen to music, and high quality headphones. Will my sound quality be different than, say, an Ipods sound, because I’m plugging them into a PSP? Or won’t it matter? I’ve always wondered this. Does the sound that headphones produce depend on what they are plugged into? (Ipod/Zune/Computer Speakers/TV/Etc.) Thanks

There are many things that can effect the quality of what you are listening too and indeed what device your headphones are plugged into is one of them. The DAC (digital to analogue converter) inside audio devices vary in quality. A better DAC will result in better sound. But, there are many other things that can affect this as well such as the compression level of the music file. Overall, it is unlikely that sound quality will change from device to device enough for you to notice. But, different equalizer settings will be.