Oh I only can adjust sub trim via the receiver on the musicast app. I have the PB2000, so no app support. But got it at a great price (for NZ) as the new PB2000 Pro had just been announced. It was the biggest expense of my new setup, speaker set was second hand $250 nzd, receiver was $849 nzd and $1499 nzd for the sub (retail $2299 nzd). But I've always wanted a decent sub. My previous one was a velodyne CHT-10R, which I got as a free upgrade after I cooked three cerwin vega subs. Turns out I need subs with limiters, digital or otherwise . The velodyne was great and took 10 years of hard use. It still goes to this day, albeit at my ex wife's house.