I keep seeing how small speakers generally, and Minimus 7 in particular, don't provide much in the was of bass. I'm not arguing with the premise, but why not use a small passive or powered subwoofer to offset this shortcoming?
Yes, those darned Minimus-7s ...
It's often cited how the Visonik David beget the Braun/ADS minis and then Minimus-7 and others that followed. The Visonik was paired rather quickly with M&K's Goliath in recognition, it would seem, of benefit from some added bottom end. Thus spawning the "sub/sat" concept which became widely adopted.
Radio Shack, who launched the M-7 in '78, seemingly didn't catch on until '92 when they finally introduced a 12" passive sub (40-4050) specifically marketed for pairing with M-7 and M-77.
I think the reason, in part, is that Visonik, Braun & ADS courted a different market than Radio Shack.
Being much pricier favoured the attention of more affluent enthusiasts who could and would channel resources to extract maximum performance from the little speakers.
Minimus-7 marketed to a younger crowd on the move. Think "portability" -- cars, dorm rooms etc. RS offered compact systems (e.g., "System Seven" and "System Eleven"), using small form-factor receivers with bass enhancement circuitry to further support that portability. It wasn't about achieving playback perfection so much as getting the biggest bang in the smallest space for the least dough that could be moved easily.
I personally find that some music doesn't require a sub for listening satisfaction. For music that demands it, I feel it's not terribly daunting to integrate a sub (or subs) with Minimus-7s and similar, within the smaller listening spaces they were intended for.
Even in larger spaces, integrating a high frequency element with a low frequency element within a room -- the third element to integrate -- is just as full of challenges and compromises with a standalone system as with a sub/sat system. Different compromises perhaps, but one can only choose subjectively from among them to achieve the least offensive and most enjoyable personal listening experience.
Kinda guarantees differences of opinion as to which options are superior.