Listen to dvd in main speakers

1. What brand and model of tire was fitted?

2. Please describe the wear pattern on the front tires in more detail. For example is the excessive tread wear.....
A. Right across the face of the tread on each tire or
B. On the outside edges of the tread on each tire or
C. on the inside edges of the tread on each tire or
D. on both sides of the tread but not on the center section of the tread on both tires.
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B is normally caused by incorrect toe setting - toe in
C is also normally caused by incorrect toe setting - toe out
D is normally caused by tire pressure set way too low.

Faulty steering and suspension components can also cause abnormal tire wear for any component that affects the wheel alignment settings.
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If you can provide a better description of the tire wear on each front tire you will get a better answer.

Under inflation. When the tire doesn't have enough air pressure, the center tends to be pushed up from the road. Thus causing outer wear on both sides. alignment problems cause wear on one side or the other. Over inflation causes the center of the tire to wear .

YES

Actually the door speakers( less than 50W) do not need high wattage speakers as they are mainly powered from the head unit. Unless you are powering with a power amp a speaker of 300 watts is not required. But if the mountings are correct , the impedance of 4 ohms is correct, then it will fit OK and work. The only main issue will be the sensitivity issue of the speakers to work with a low output.
I have considered that a highly sensitive speaker( small voltage response) will sound great like an expensive power amplifier and high wattage speakers. Jensen had some good ranges in the 80's but now we have hard suspensions with poor response.
So my final suggestion is if powered from your head unit test it , there is no damage but if there is a response problem if you are a soft listener. Other wise there is nothing to worry on as the amp will handle except your listening pleasure.
So test to decide. Credit me if this info is helpful.

My grandcarvan sxt came with a remote for the DVD system and wireless headphones from KOSS. You have to press the headphone button on the remote to change it to headphones otherwise it comes through the main system. With the button pressed we can listen to cd or radio in front while they wear the headphones in back. You might need the remote to change it back to main system. The headphones from Koss are lifetime guaranty and not too expensive.

Tires need balanced or you need an alignment. Make sure tires are inflated to max cold psi

I had the similar 'wobble of death' for these late 90's pathfinders. Just change all 8 bushings on REAR lower and upper control arms. That is main problem. Everything else has marginal impact like front control arms, wheel bearings, shocks, etc.

problem is with over inflating the tires,causing middle tread wear,as long as you have more the 3/32 tread wear in the middle than you are ok.always set tire pressure when cold at around 33psi,check tire inflation sticker on dar jam for exact tire pressure

radio shack

You can set the sound to play through the car's speakers. If you don't want it too loud in front, you can use the audio setting for the fader to just play in the rear.