i just got the amp, it's jenson, 340 watt, and yeah i meant wattage lol, it looks pretty old school

Jenson JXP340
2/1 Channel Amp
Serial NO: MA02030 0 3 6 9 0

 

JXP340
Power output @ 14.4 VDC
(4 ohms).................60watts per channel rms
(2 ohms).................85watts per channel rms
(4 ohms) bridged......170watts both channels bridged rms

wala!

 

okay, but exactly what does that mean lol
on the back there is a sticker that says

POWER OUTPUT
60 x 2 @ 4 OHM
170 x 1 @ 4 OHM (BRIDGED)

 

ohms are a measure of resistance think about it like this if you are running full speed and there is no wind you can run full speed if you are running and there is a 20mph wind you cant run as fast that would be like a 2 ohm load and if your running and there is a 40mph wind that would be like 4 ohms

every amp has a minimum amount of of ohms that it can run in your case your amp can only run at 2ohms per channel but can run only at 4ohms when bridged. bridged is when you take the positive from one channel and the negative from the other and use those as your only posotive and negative it gives you the power from both channels

in your case i would recommend one 4ohm sub a 10 or 12 would run nicely

 

okay, so I'm looking for a 4ohm sub, 10" or 12"? and does that just plug into the amp?

 

a 4 ohm sub will just work best something around 150 watts rms and 10 or 12 it doesn't matter and you just connect the posotive to the posotive terminal on the amp and the negative to the negotive