Well I recently bought a 15"Rockford Fosgate p3 sub. It is 500w rms and 1000w peak.It has DVC at 4ohms. I'm very knew to the whole ohms and stuff so i need help picking out an amp for it. I am on a tight budget so price does have to be pretty low. Thanks in advance.
Rockford t5001 (more power than what you need, but it will be there if you do future upgrades)
Rockford p6001
infinity 16001a
JBL gto 601.1
Kicker 04sx650.1 (only cheap if you buy refurbished)
You could even do like a hifonics BXi1206d. They are very good budget amps and that amp will work if you ever decide to get 2 of those subs.
If you are buying online, or not afraid of ebay, these are some solid choices. But if you are not buying online, then id go with the Alpine mrp-m650, there only like $209 reg price at best buy.
for ultra-cheap you could go with a kicker zx400.1 which will put out close to 500wrms. refurbished price at hifisoundconnection.com is like $130 shipped.