Every Modulus Quantum I have ever heard has massive, well defined low bass, even the 5ers.
Really? I've had a Modulus Quantum whose low end is certainly extended and smooth and definitely well-defined, but "massive" is probably the last word I would use to describe it. "Massive" to me suggests thickness and fatness (or phatness) and the kind of impenetrable girth that concrete pylons or alien motherships or amateur pron starlets have, and my Modulus exhibits none of that. I'd say its low end is more "transparent" than "massive". It's super clean, hi-fidelity low end, but it's not really "thick" to my ears.