Subwoofers and Merlins

A sub works well with the VSM-MX. I'm using a Vel DD-15 with LPF set at 30Hz & 12db/octave slope. Avoid any recent DD models with 2.2 software; 2.2 precludes crossover settings below 40Hz.

When using the BBAM you need preamp line-level inputs to the sub, as the BBAM rolls off all bass content below 28Hz. For seamless midrange to bass response it's best to keep the BBAM in the circuit and use a low & unobtrusive crossover point.

I've improved the Vel with a rectifier upgrade and silver internal wiring. If I were buying new today I would try the JS Audio Fathom.

Maria, in my benign room at least, without the sub in the configuration the VSM-MX with BBAM is flat +/- 3db down into the mid 30's, after which response tapers quickly to the point that below 25Hz there is no useful LF. Setting sub xover at 30Hz and 12db/octave slope adds fill up into the mid-30's and foundation & impact from 17Hz-30Hz. Even with this low xover and a fairly steep slope, the sub's digital EQ can tilt up bass response to fill voids in the 35Hz-45Hz range owing to room effects. But in general bringing the sub back in at higher frequencies than 40Hz just muddies the sound. With this speaker you want to bring the sub in low and get it out of the way with a steep slope above the crossover point.

Nice thing about some modern subs is the integrated frequency analyzer that visualizes response with and without the sub. But IMO, while satisfying an unmodified Vel DD is not the last word in tight bass control.

Maria, my interest in the Fathom was stimulated by praise in TAS & Stereophile by reviewers well versed in the Velodyne DD.

After all is said & done the question is whether you and your room really want bass foundation below 30Hz. Current VSMs are convincing down into low 30's, but if you fancy a kick drum in the solar plexus you won't get it without a sub.