rise depends on a few things.. there is nothing that system the z will have a greater impedance gain..
the only reason would be cancellation and space constraints that would cause larger peak further away from tuning..
at tuning your going to get a high rise anyway as its naturally occurring durning resonance..
the higher fs on the z will cause a alightly higher rise but it allows a low qc as for as box and port dampening..
point Id like to make is you should be seasoned on basic electrical theory as well ms acoustics before getting a system of this caliber..