AudioTheory

This is my first after market sound system and I'm hoping I didn't just screw myself on the purchase. I can build a computer from inside out but know nothing about car audio.

I have a 2004 Monte Carlo with a Panasonic CQ-9901U headset. I just bought the Infinity Kappa 693.7i (6 x 9) in the rears

http://www.crutchfield.com/App/Produ...ures_and_specs

and the Polk Audio MMC6500 (6 1/2) for the fronts.

http://www.crutchfield.com/App/Produ...ures_and_specs


I plan on installing the fronts, rears, and a amp all at the same time.

My problem is that I just now realized that the Ohms is 4 on the Polks and the Ohms is 2 on the Infinitys. Can someone give me some more insite on if these will run correctly together and what kind of amp I should look into. I have JL Audio in mind. Thank you.

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durwood

It's intersting that Infinity decided to go with 2ohms on those over 4ohm. I'd imagine that will cause many headaches for customers upgrading their stock speakers. (Headunit will overheat and cutout).

If you plan on using an aftermarket amplifier and not the built in amp in your headunit, then almost every aftermarket amp can operate at 2ohms (as long as you don't bridge the channels).

JL is a nice choice because the power supply design does not care if you connect 1.5-4ohm speakers, power ouput will be identical for any loads between those values.

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Mylt1

just send them back and get the same 6x9's in 4ohms. like these.
http://www.crutchfield.com/App/Produ...ures_and_specs
you know, pushing that many watts is gonna sound like crap if you dont add bass to round out the system, and at 100w thats gonna need to be one hellofa sub.

pancit175

I once read a write up about why "they think" that 2 ohm speakers are more efficient. They went into detail about stock speakers testing out at under 4 ohms like 3.4-3.6 ohms before they are being used. Then after signal is given from the source unit, without the help of external amplifiers, to the speakers and the voice coils warm up, that the impedance is closer to 2 ohms.
But I question the fact that if the impedance drops after it is in use, wouldnt the aftermarket be exposed to that same type of drop? And with that question in mind, if you start out with a 2 ohm speaker, would it not drop impedance while it is in use to something like 1 ohm which in most applications cannot be handled by a normal headunit (factory aftermarket) without the help of an external amplifier rated to do so.

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pokki

Buy any half decent 4 channel amp and you'll be sorted.

AudioTheory

good to hear.

I've got it picked out now.

http://www.crutchfield.com/App/Produ...36A4300&tp=115


Should sound good, I'll add a sub and another amp later.

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