Headunits and Amps: Working Together

Hey all,

I just had a question about whether or not Headunits and amps could run speakers together.

Ie, I have, say, 4 speakers (2 front, 2 rear) and a sub.  I want to run the front and sub from my amp, but for the sake of Rear Fill, would like to run my Rear speakers off the head unit (with a wattage limiter devicey installed, so as not to destroy my speakers).

My headunit has a switchable "Sub Out/Rear Out" connection. So I'm assuming that if I switch it to sub out, the headunit will still let me use its standard speaker level connections to power my rear speakers.

Is this possible?  I know alot of people will advise against running 2 speakers off the head unit if everything else is on amp, but its just a semi-hypothetical question.

Thanks

Haha, fair enough.

Naturally I'd also planned to use a HPF. But i read on... perhaps it was CrutchfieldAdvisor.com or another forum, that you could buy something that limits the power that will go through to a speaker.  So, for example, I could install one and limit my rear speakers to 20W input.

I just assumed it was some form of variable resister.

But thanks for your help! it's much appreciated.

P.S. Patent Pending on "wattage limiter devicey"

..Just to take some of your advice. If I want to limit my rear speakers to frequencies above 80Hz (the subwoofer LPF is set to 80) than wot combination/wiring would i require to make the crossover?

Thanks

Wow, you're good! it is, in fact, a 6*9.  I'm reluctant to retire the 6*9s coz they do a great job even without the amp.

OK, so I shall baffle and crossover as you describe.  Thanks for your help and patience.