What is the most cost- efficient amplifier for a set of 4 JBL JRX125 speakers?

Question

I don't know anything about wattage and ohms. I've got plenty of explanations that didn't make sense to me though.

Answer 1

Static - JBL recommends an amp that puts out at least 500 watts per channel into 4 ohms.  

Two of these would work great:

http://www.zzounds.com/item--QSCGX5

Remember that it is more dangerous to underpower your speakers than overpower them.  An underpowered amp will distort sooner for a given volume level and distortion is what damages speakers.  Always keep an eye on the amp "clip" lights.  They should never be lit continuously, only occasionally on peaks.

Answer 2

Im just curious as to why someone with no knowledge of amps ect ect is choosing PA speakers?

Are you going to be doing live gigs or DJing?