I do think M mickaelsons system certainly would improve with adding the JL7 mono blocks .
For this kind of $$$ spend on the system its merely pocket change
I m quit surprised the JL 5 s could even drive the subsonics .
While CAT gear is great , its off course still a tube amp .
And the XVX s are 1,5 ohm minimum , 92 db eff .
1,5 ohms is quit low ,
CH precision can take an example out of that !!