Infinity Quantum 2 - crossover - tri amp

Infinity crossovers in some cases were absolutely indefensible in modern standards. I’d carefully think about whether you really want to rebuild or rethink anything from them. DIYaudio is a better place for this type of question.

If you are going to tri-amp, the original values won’t matter to you. Best to use a passive crossover in the top sections than the bottom, so you’ll wire the woofer directly.

You will need to fully measure the drivers and cabinet, so whatever the original crossover did is barely any sort of guideline, especially if you want to use DSP along the way. 

Already getting helpful tips from one reader on DIYaudio. 

I may just start with active bi amping, running the two Watkins coils in parellel and use DSP driven by big power amp (have class H and class D on hand), then the passive network for the midbass to EMITS with another amp (class A/B for now, may class A or tube in the future?). 

Well, blow me down, I learned something unexpected:

https://www.audiokarma.org/forums/index.php?threads/watkins-woofers-whats-so-special-about-them.115775/

In every other dual voice coil device I’ve seen the voice coils are identical. In this device they are not, which would explain why it would have different crossover sections feeding it. May not be a good idea to wire these in parallel at all. Honestly given the age difference and improvements in response I’m 100% sure I’d substitute the driver OR use 1 coil with DSP compensation for the differing responses on each coil. Even if I get it all working, those drivers wont’ last forever.

The weird woofer and odd 4-way design really makes me think of this speaker as having a slew of driver response problems in each driver section we just wouldn’t put up with today.

This is not actually a 4-way speaker, it is a 5 way.