Jaylah - Option Audio is a reliable but budget brand. In future you should always test out the audio equipment you like first. For example, head over to a car audio (ICE) specialist and have a listen to each subwoofer you're interested in. Heck, ask for some opinions while you're at it as most car audio specialists want you to buy the gear that is right for you, not what gets them the most money.
In any case, you have already purchased the RF sub. From the link you have given, the sub is rated at 500wrms (1000watts peak) with dual 2ohm coils. NEVER look at the peak rating, it will be useless as it's more of a marketing gimmick than anything. What you want is the RMS rating. This is what you require as you will be needing an amp to power that rating.
As mentioned before, you have dual 2 ohm coils. This is the impedance of the sub, dual just means you have 2 sets of coils (ie. 2 sets of positive and negative terminals). To wire these to an amp, you have 2 choices as follows:
1. Wire in series (positive -> positive -> positive of amp, negative -> negative -> negative of amp). This will show a load of 4ohms to the amp.
2. Wire in parallel (Negative -> positive -> positive of amp, positive to negative -> negative of amp). This will show a load of 1ohm to the amp.
There is a diagram somewhere on the net, lemme see if i can find it*
It is important for you to know that each wiring configuration is different. Some amps do NOT "support" a 1ohm load. Hence the reason you will be using a 4ohm load.
The main difference in these loads is the damping factor. The higher the impedance (higher the number) means a better damping factor. Dampin factor : Time for the sub to excurse (brain block hahaha) back in time for the next subfrequency beat. Usually lower loads than 2ohms are for people who want to achieve high SPL db scores. Don't think you need to know that yet :P
Anyway, set a budget for your amp, and then have a look around. Remember you also need a wiring kit (ground + power cables, RCA for signal from headunit -> amp, that wire that tells the amp to turn on but i forgot what it's called cause it's 3am....). Set aside a budget for that too. Also a box for your sub
Have a look at MEA (mobile electronics australia):
http://www.mobileelectronics.com.au/...p?showforum=41
They have some good sales, just research it before you buy it
Hope i've helped somehow
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