Will this amp trick work for increasing bass performance?

Too bad you eliminated the easier and best solution: a good subwoofer. İt would have been cheaper too. 

Thanks all, I'm learning a lot! Few points:

1) It's a living room set up, hence my preference to not have multiple subwoofers around;

2) I've tried adding a single sub. Enough bass but too muddy, and for me too difficult to get it right;

3) The 11 inch woofers in the Focal are plenty powerful, but they don't get engaged enough. Simple bass and treble control, like in my car, would do the trick;

4) @oldhvymec I'm not spending an additional $30k+ for bass. That's including an amp I'll need anyway. It's either X350.8 or X250.8 + XA60.8, with the latter costing "only" $4k extra;

5) Not hung up on Pass Labs. Although pricier, I'm also considering Ayre KX-R with VX-R or MX-R;

6) My only source is streaming Tidal (via Roon in future) and I'll probably choose the Ayre QX-5.

Question:
To what extent would a high-end equalizer degrade the quality of the signal? Would you notice the extra component in the pathway, even with the EQ set to flat?
I don't mind the extra cost and an EQ will sure do the trick. But if my sound quality is seriously affected, it may not be worth it. Easy enough to try though.

You need to remove the bass from the mid/high amp you can use a pair of Aesthetix Atlas amp it has a internal high pass filters up to 200Hz they start at 10K and go up from there                                                    
biamping can have a slight time issues between the to amps

Few points to consider before spending $30k for amplifiers. Your speaker 3dB frequency cutoffs are 27 Hz - 40 kHz. Specifications says low frequency point is 24 Hz at -6 dB.

Since you are not going to use any sub-woofers, your listening room dimensions must be able to reproduce the low frequency granted you have software that goes that low (e.g., pipe organ music). At sea-level, your room should be at least 23 ft long to correctly reproduce 24 Hz signal. You can get away with 20 ft long room if all you need is down to 27 Hz which I think would be the case. The lowest frequency on a grand piano is 27.5 Hz, which is almost at the start of the human hearing range

Yes, I agree you will need a muscle amp to reproduce bass because it is all about pushing heavy air mass. Sensitivity is 92 dB, but impedance drops to 3.2 Ohms. I would look for a SS amp that can deliver plenty of current. At your price point, there are many choices including Boulder amps for an example.

Good Luck

robert1976 OP

One of these could work wonders for you, they are very transparent and have great adjustablity of ranges. for just $149
And you can send it back after 14 days of trial.
https://www.schiit.com/products/loki

Here’s a graph on what it can do, I have one in my kit and love it when needed, for certain system setups and you just need, one good amp!!!! and a preamp or source with volume and this goes between them.
https://www.superbestaudiofriends.org/index.php?threads/schiit-loki-eq-measurements.5153/

Cheers George