Won't equalizing a passive woofer in a tower mess up the overall SQ.
Assuming the cabinet, and drivers aren't coloring the bass response, there's really only two things contributing to SQ
- Flat Frequency Response
- Ability to maintain that response at different SPLs.
So you're right, equalizing a woofer to not have flat frequency response will mess up overall SQ.
Just like having a powered woofer 10db hot will
Like messing up the rest of the off-axis FR?
You'd only be implementing a filter from about 110hz down. That way you can keep the bass boost away from the male vocal range (otherwise male dialogue will start to sound bad with too much grunt and chest). So you're well away from the bottom crossover of the salons (which is like 2 octaves higher)
Passively bi/tri-amping won't do much good. We all know about passive bi-amping, right?
Sure it will, if you've got the gains set much higher, and more powerful amps, on the bass section.
You can turn up the bass EQ of the passive bi-wire Salon2 or Soundscape 12 or the tri-wire KEF 207/2 to the moon or sun, but they will not output as much bass as a pair of BP7000SC with two 1800watts active 14" subwoofers and four 14" passive radiators.
Well the Salons have the radiating surface area of a 14" woofer. While not very
sensitive (needs more powerful for output), the heatsinking of the TRIPLE 8" modified JBL woofers should mean it can handle a LOT of power. The vents don't come into play until the very deep stuff (IE 18hz - 30hz) so the only limit on output is probably amp power, and driver ability to take amp power (thermally and mechanically). The crossover components on the Salons are also pricy stuff designed to take a beating. Given the 86db sensitivity of the Salons, 1000W doesn't sound crazy.
So let's say you roll in one of these amps to handle the bass drivers:
Macro-Tech Series - MA-5002VZ Specifications
You'd have a lot of dynamic power on tap if you really wanted it.
The main issue with using different amps, is whether the gain scales at different SPLs. I'd recommend having the same amps top to bottom. Even 300w from the ATI amps is still a lot of power and with some boost might be more output than you need.