Bi-Amp Question

Hello to all,

First off, I've perused the threads on bi-amping and gleaned what information I could. The concensus seems to be that the benefits derived from bi-amping are greatest when using an active crossover.

I currently have a four-channel amplifier rated at 75Wx4. It is powering a front component set as well as my rear fill speakers. I've minimized the gain to the rear speakers as a result of excessive output, to the point where I'm sure deck power alone would be sufficient. Which leaves me with possibly two un-used amplifier channels...

I'm considering the purchase of a set of Focal 165W 2-way components. I've listened to these in a local car audio shop and was very impressed with them. Here are there specs:
     
2-way separate system,
possible bi-amplification.
165mm (6-1/2") midbass,
40mm (1-3/8") v.coil,
100mm (4") magnet.
TN 51 tweeter.
2-way separate crossover
with high end components.
24 dB/oct. (3kHz) with
adjustable levels.
Max. power handling: 200W.
Nominal, power handling: 100W.
Sensitivity (2.8 V/1m): 92.5dB.
Frequency response:
50Hz-22kHz.

I've thought about bi-amping the speakers using only the supplied passive crossover. For this particular scenario, will I derive enough benefits to justify bi-amping? I could conceivably sell my amplifier and purchase something such as the Jl 300/2, but I'd rather not. I'm just trying to find out if this would work without going with active crossovers. Thank you.             

If the stock passive crossover allows bi-amping, you could certainly use it and retain any EQ and voicing that Focal built into the crossover.  I don't think this is the case with the 165W as it is a single crossovr for each set of speakers, but I may be wrong.  Does the crossover have dual inputs and removable jumpers to seperate the two filters?  If not, you cannot use the stock crossovers to bi-amp.

One idea to consider is the relative power consumtion of woofers VS tweeters.  A good rule of thumb is 70%/30%, meaning a woofer uses 70% of available power to 30% for the tweeter.  The higher you push the crossover point, the less power the tweeter uses.  So in a bi-amped system the tweeter amplifier can be much smaller than the woofer or mid amplifier.

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Yes, I believe that the crossover has dual inputs and would work in this type of scenario. Here's the link to the set, including the crossover:

https://www.focal-america.com/catalog/utopia/165w.htm

I'm hoping to optimize my current setup and properly use the four channels to bi-amp. I'm thinking that I'd be better served by directing the power to the components instead of the rear fill. In your opinion, would this work while maintaining sound quality?