Hi Pauly,
How does my suspension do all these things?
By obeying Newton's Third Law of Motion.
I had an unsuspended table not to long ago and it was less dynamic, had less bass impact and had a much higher noise floor than my Oracle. (It also cost more than my Oracle).
I suspect the sonic shortcomings were directly related to the fact that each and every micro vibration was dumped straight into the cart, something not happening with my Oracle.
I suspect you're right. There was clearly something amiss with a more expensive table that couldn't match a less expensive one. I did mention that a well designed, high mass plinth is needed to damp resonances on a non-suspended table. Maybe your previous table lacked that?
Motors & belts:
You're right about motors of course, they're vitally important. Clearly a "puny" motor, whether DC or AC, will have more trouble resisting stylus drag than a more robust one. And a noisy or cogging one will be unsuitable for direct torque coupling to the platter. (Can you imagine a direct drive with a noisy or unstable motor? Ewww.) The best of all motors would be powerful, quiet and would provide constantly linear acceleration, not a simple task.
We may have to agree to disagree on motor/platter coupling. I have experimented with at least 10 different belt types, on two tables and with three different motors. This was with platters weighing 25 and 35 lbs. respectively, far heavier than an Oracle's.
Despite these hefty platters the differences between one belt and another are invariably audible. Elastic belts ALWAYS stretch on leading edges of transients (that's what "elastic" means of course), and a more powerful motor simply exaggerates this. After reaching full extension, the elastic then seeks to return to its resting state on the trailing edge of the transient. This is also audible. Slippery belts (silk thread, silk tape, etc.) also degrade the sound. When a transient increases drag on the belt/pulley interface, a slippery belt slips. The effect is pretty similar to the leading edge stretch of an elastic belt, though there may not be any rebound on the trailing edge.
High rotational inertia cannot overcome stylus drag. That's a physical impossibility. All it can do is lower the frequency and amplitude of induced variations in rotational velocity. That may dampen stylus drag effects but it will not audibly eliminate them. A strong motor with a linear torque coupling to the platter is the only way, at least IME.
Best,
Doug