My sound on computer sounds tinny after i moved it . the speakers seem fine

get to the audio in settings and adjust bass and treble effects

Have you checked the "treble" setting in your sound settings? It could be set too high, which would account for a tinny sound.

just replace the speaker will solved the problem.

It sounds like the woofer part of the speaker is bad, while the tweeter is still good. You are going to have to replace the speaker. Speakers are generally sold in pairs, so it would be best to replace both rear speakers at the same time.

try swapping the speakers around if the problem still persists either the speaker is faulty
the speakers plug/outlet is usually at the back of the computer you will have to open up the computer to check the lead attached to the rear of the input plug make sure the connection is good
be sure to wear an anti static earth strap before touching anything inside your computer
try cleaning your computer of dust using a fine air blower from a compressor making VERY sure that there is no MOISTURE in the air line specifically around the CPU central processing unit and your sound card dust causes static to build up in a computer causing it to overheat any many other problems
hope this helps

This might be helpful. Most stereo receivers have 2 sets of speaker outputs, A and B. Each have outputs for left and right speakers. On the front panel of the receiver, there should be a switch to turn on/off speaker A/B. When using both A and B, (a set of speakers on each A and B) you will lose a bit of volume.

Another possibility is, if the speaker cable length to your covered porch is a long distance from the receiver, you will lose some power from the receiver. Try using a thicker gauge speaker cable for longer cable runs. Try 14 gauge or 16 gauge.

Yes that is the way to go unless you want to buy a sound card and stick it in an open slot if you have one.

Both of your problem amps were made in the '70's or earlier. It is entirely possible that the coupling capacitors are failing. This is an issue for a service center whether it is caps or something else, like failing tubes.

The good news is that installing metalized polypropelene capacitors will make those classic amps sound incredible.

The "tiny sound" may be a blown woofer you are only getting sound from your high section.

try fixing its amps by simple reheating it. if still doesnt work try replacing its parts... it is certain that it has a prob on the amps.