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Looking at this, one is left to assume that 4 ohm amp power is your only choice out of channel 5 - and there is nothing wrong with that. Especially with a single voice coil 4 ohm woofer - that's likely your best bet.
Again I know very little about that amp, like how the power to channel 5 is sourced.
I know it comes with a "Bass Boost" knob , which is likely an independent gain for channel 5, however.
I don't forsee anything wrong with your plan. Parallel wiring in this instance reduces the resistance of the speakers- not increase the output of the amp when wired +to+ and -to-.
The result is the working temp of the speakers will increase, the distortion level of the speakers increases, the volume of the speakers will increase, and that is done at THEIR expense to spare the amplifier from having to output more power and increase ITS' working temp and distortion.
The 3 inch speakers will see a 2.5 or 2.6 ohm load I think. There is a formula.
If your speakers are good it won't blow them up by separating the voice coils from the magnet. Those Cerwin Vegas are by no means a competition grade unit and I imagine short trips at a moderate volume won't hurt them.
Only one way to find out short of contacting Cerwin Vega.
Again, your due diligence or lack of is not my problem. I'm a stranger on the other side of the internet.
In all things, including car audio, you get what you pay for and the sky is the limit.
Those speakers and amp are low budget and I expect a similar level of performance. Granted to a guy like you that appears to be shooting from the hip and likely doesn't claim to be an audiophile persay, you may not know any difference between Cerwin Vegas or something extremely high-end LIKE Boston Acoustics or similar.. It's not a competition grade system by any means BUT! You will probably love the crap out of it and think it sounds awesome. At the end of the day you'll still have money in your pocket and every trip to work,home,or to the store will put a big shi*-eating grin on your face and you prolly ain't never had it that good.
**Warning!**
An externally amplified car audio system
WILL SET a precedent that you may never get away from. Every factory stereo is gonna suck balls - you'll see.
By the time you tune it out between front/back/ and sub it'll probably sound pretty great. ESPECIALLY! compared to what you're running now.
Run at least 4awg power and ground If not bigger. Make the ground as short as is reasonably possible and secure it to bare metal with bare metal. The further away you keep the speaker wires away from those? the better it will sound.
Butt connectors are NOT your friend in car audio BTW. The devil is in the details and so is sound quality. Think solder and heat shrink.
Hope this helps, and good luck!
P.s. = take pix.
Check out this cool old Tshirt I have. The finals were in Tulsa,Oklahoma. I competed in a G body (Monte Carlo) with 12 speakers and three ORION amps in the 250 watt NOVICE class. Took 7th place out of 42 making about 800 watts running 4x12" ORION XTRs. I was barely 17 and was sponsored by the place I worked at - called Traffic Jams Audio, which was owned by two brothers Lee and Larry Lawyer - that were cops.
The system was destroyed by a jacked up Chevrolet 4x4 that drove over my trunk.
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