Amp Reccomendations for Memphis Mojo 12

So let me get this straight. Your new to car audio but rebuilding a sub?
As for an amp, what's your budget?

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Yes, I figured reconing a sub can't be that hard, and it would be a great way to learn about speakers. The kit wasn't too expensive and the sub cost me nothing, so I'm not going to be heartbroken if I break it. My budget is somewhere under $600. I'm looking for an amp that I can continue to use after I'm done with my mojo 12. I want it to have enough power to be able to use it on a stronger sub in the future, so there's room for a bigger sub without having to get a bigger amp.

that does sound like an interesting combo.
Also, since youre rebuilding it, what does the coil call for rms? what impedance?

stock coil calls for 1500 rms

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According to Springfield, the rms is 1800+ with dual 2 ohms.

Kit I bought: Memphis Mojo 12" 15-CM12D2 Recone Kit - Dual 2 Ohm

The voice coil it comes with: https://www.springfieldspeakerrepair.com/ProductDetails.asp?ProductCode=AVC302D2

https://www.amazon.com/Taramps-HD8000-12-6V-Competition-Amplifier/dp/B014JUGG36/ref=sr_1_1?s=electronics&ie=UTF8&qid=1513715298&sr=1-1&keywords=taramps+amplifier&refinements=p_36%3A50000-60000
better have your electricals up to snuff man

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Holy Crap is 8000 watts necessary? Is there a typical rule of thumb for how many watts you need in respect to your sub's rms?

You will want a 3k amp to get that thing moving good. That means upgrading the alt to a high output (200a minimum) and upgrading the main battery and even a second battery in the back. Subie's come with pretty weak alternators from the factory, you'd be lucky if that thing has a 100a alt.

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That actually works out great, because I think my alt or battery is shitting the bed. Sometimes (lately) my car starts, sometimes I need a jump, and my electricals even died for a sec while idling. What website do you recommend for high output alts and batteries?

go big or go home LoL
i only recommended that one for massive headroom. That thing wouldnt even be breaking a sweat, just keep the gain down

and not really, its very hard to overpower a sub, but its super easy to over drive a sub or clip it to death

Mechman Alternators | Made in the U.S.A High Output Alternators | Call 1-888-MECHMAN for the alts and youd be surprised how many folks sell them on here, or GP CAR AUDIO Ground & Power Ground Pounder has alts and batts.

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I'd like to go above and beyond what the mojo needs, but I don't think I need to go that over. When I said I want to leave room for bigger subs, I meant maybe a 2500 or 3000 watt. It looks Mechman does not have any subaru alts. I could get one of their universals, but how would I know if it will fit? Are GP batteries better than XS power?

GP is as good as XS Power. Try contacting Ohio Generator for an alternator.

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I would contact them right now, but I do not know how big of an amp I will be getting, so I don't know how many amps I would ask them for in an alternator.