Stick with the VFL series.I dont know to be honest.Im not sure you will find a better quality amp with power as small as that amp is.If AB was crap, I woudt be running them for myself,and Ive been running Zed amps since the late 80s.You may try the 18801 in which is smaller in the VFL version, but Im not sure it will satisfy your needs @2 ohms mono,and I can not vouch for it as Ive not tried one out.If you want to go old school with a good used Zed amp @2ohms mono I have some little Autotek BTS 7050s that will bang the snott out of any 600-1k sub daily but its an A/B amp,and need ventilation.May look into a Massive Nano amp?Id still recommend the AB 26801 d all day long for your set up though