Gain structure - the easiest way to measure ?

Hi all, I am thinking through my Av system which is predominantly old Hi-Fi and wanted to see how the gain structure works for my subs and measure how I increase and decrease gain to possibly structure in a better way.

Say for the Left speaker I go from my BR 4K player to a naim 32.5 which then goes to a mining DSP 10x10 HD (I reduce the gain by 10db to match the LFE channel which is direct into the DSP) and then this all drives 5 subs in a matrix set up)

So for say one sub from the left channel I am Xmv from the BR player which is changed at listening volume to Ymv leaving my pre amp then Zmv leaving my DSP then Tmv leaving my internal preamps in my subwoofer amp then finally Smv leaving my power amp

What is the best way to measure this with REW, the generator and which function ? my subs are only <65Hz
 
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