Too bad you already ordered an amp. The Denon x-3800 has the "big" Audessey version ond would correct your problem with 10 minutes measureing session. It is not only equalizing, but does a lot more for corrections Most "Audiophiles" don't like Audessey, they never tried it or think it is too cheap, as you get it with a decend AVR for free, while Dirac (or Antimode in some markets) is so much more costly, doubeling the price of the Denon for example. If Audessey is a no in Hiend, why is Dirac accepted? Hiend is not always pure logic...
The features of the Technics have noting to do with your problem. Just some fancy naming from the marketing division, like "New Class-A" (if you remember).
The 80€ number was just an example, I thought of speaker and the CD to amp wires. If you got simple, pure copper 2.5mm wires and some decend signal cables, anything will be OK. No matter of +- 50€.
IMO most people spend too much for fancy wires, I do them my self from components bought at pro audio sources like Thomann. Mostly I use wire sold in meters from Sommer Cable and low cost studio quality connectors like Rean or Amphenol which will last a life time. You can not gain anything there.
Room treatment is a very hot thematic. From serious things like carpets, curtains and absorbing /diffusing measures there is only a short distance to snake oil like "bass traps". Like with voodoo cables, there is so much money to make, there are numbers of promoters and victims that don't want to accept they got scammed. So some will vigourosly defend them. Bass traps are always no return purchases. If they don't work, the seller will tell you to buy more...
Putting your satisfying, smaller speakers in the same room as the FOCAL is a very good idea. Focus on the higher region, your small speakers may simply not reach that low or even profit from the resonance the Focal is suffering from.
Something like putting some socks, foam plugs or what ever into the rear and front vent is nice. You don't need to hammer something inside, just close them. Many speakers come with foam plugs from the factory, so nothing bad about that. Closing one vent will lower the f3 frequency of the tuning (if both woofers use one space). All experiments like front or rear, one or both are OK if they help.
Do not point the speakers directly at the listening position, that may be too much. Sometimes just parallel to the wall is better.
Expensive speakers are mainly bought by older, more wealthy people. So a little hot tuned high range may help with some hearing loss. Too much bass is mostly an argument for the younger generation, try some Techno, that will be fine
