Is Direct Drive Really Better?

I use a SUPERIOR belt drive mechanism. under the platter a large 10lb. live rat (rodent) runs on a BELT, the heavy 50lb platter (and three ball govenor) does indeed smooth out any speed irreglarties. There is NO measurable rumble. Completely independant of powerline noise. Feeding and clean-up are manditory.

Mint604,
You bring up an interesting point. All (4 now) drive systems require some kind of maintenance and I suppose it should be a condideration in these comparisons. All the other motors need lubrication and yours requires nutrition. The IW has the most moving parts and would presumably be the highest maintenance system. BD probably only ever needs a new belt although I guess bearings and springs could also wear. With DD the only issue beyond lubrication would be the potential for motor failure and that would be fatal I imagine to a vintage table. Does your rat work quietly?

Dear Macrojack: I think that because there are several subjects on it it is almost imposible to tell which one is better: DD or BD.

If we take two of the TT primary functions: speed accuracy and speed stability, we can conclude that the DD beats the BD system: example, the Walker one has 0.002% on this spec against 0.001% on an SP 10 or Exclusive.
If we take the wow and flutter, the Sp 10 beats ( easily ) my Micro Seiki RX 5000: 0.015% against 0.025%.
We can take too the Rumble and here in the case of Walker or Avid it is around 90 db against 92 db on the SP 10 or 95 db of the Exlusive one

Btw, I own SP 10s, Denons, Micro Seiki, Luxman and Acoustic Signature.

From the point of view of how it performs on their designs the DD ones beats the BD: you can " see " at the measurements and this is a fact, period.
It is curious the BD manufacturers almost don't give almost any specs about: I wonder why?.
All those specs are extremely important to know about the quality build design if not which were or which ones are the TT targets on the TT design and how the designer compare the result ( build ) against those targets ?. Of course that the TT designer can had other kind of targets but it does not sense to me if he do not take in count those ones like speed accuracy and speed stability between others.

The TT specs can't tell me " per se " how good is the music reproduction performance but tell me how good care take the designer on the build of that unit and at least on the speed spec can tell me what " to wait " for.

Now, the " best voted " today TT is the Rockport that is a DD design and in the other side the Walker is the best example of what we can have in the BD designs.
Both designs go to an extreme design, here we can't say ( real ) which is better because in both trhey take in count almost all the issues for a perfect TT performance design: speed accuracy/stability, kind of motor, platter resonance/vibrations, energy disipation, plataform, air bearing, tonearm, quality on execution, " beauty on that execution ", etc, etc.

Which one do you like and which one performs better? ? , this is a subjective answer and we can have different answers about like different persons we are.

Which one is better?, here we have to go for facts: measurements, something objective and for this point of view the DD is a better one.

I send to build my plynths of my SP 10 and Denon TTs with a solid beautiful marble and Onyx one piece stones ( 40 kg ), as a fact this plynths function like the tonearm boards. I use the Audio Technica pneumatic suspension footers and tip toes like between TT and the plynths.

These DD TTs are very precise and have better music sound reproduction quality performance at both frequency extremes than my BD TTs: this is very easy to find out, play a piano work in either design. Why am I not using them?: because I need to mount, at least, three tonearms in each TT ( that I can change in any moment ) and the Micro and AS ones comes ready to work on it.
One of my future targets is to build a system plynth/arm board for I can use my DD TTs in the same way that my BD TTs, in the mid time I have to accept a 95-98% ? quality performance of what I can achieve with my DD TTs, not big deal.

Regards and enjoy the music.
Raul.

Raul: Wouldn't the rumble specs, at least, be somewhat dependent on the plinth made for a deck-mount DD?

Anyway, whatever one thinks of Michael Fremer, to me it's interesting that a guy who's critically auditioned that many turntables, and proclaimed the direct-drive Rockport Sirius to be the uncontested best at the time he had it, later decided the belt-drive SME 30 (at about 1/3 the price without arm) equalled or slightly bettered it (with a Graham arm fitted). This is notable not only from the DD vs. BD perspective, but because the Rockport had an integral linear-tracking arm (Fremer has in the past has extolled not only the theoretical but the actual benefits of linear arms if properly executed), air bearings all around, an integral active isolation stand, the more complex motor controller, and was maybe 4-5 times as massive -- none of the which the well-executed but by comparison conceptually basic SME could match on paper. The Rockport may indeed have the better specs -- I don't know that we know, but anyway at a certain point a few more -dB or a slightly lower % may not matter in practical terms -- but for all its engineering heroism, if it doesn't sound clearly superior at its much higher price, which TT is ultimately the better design? And why would a designer then need to go to the trouble and expense of making a direct-drive system in this day and age?

To me the real-world value of DD might be where it is right now on my gear rack: a relatively inexpensive, highly durable, low-maintainance, operationally flexible, speed-accurate, good-sounding TT for not a lot of money, that probably has significantly better specs than any belt-driver in its price range. Which drive method is allegedly "superior" at the top end of the food chain is a debate for others, and hypothetically interesting as the question may be, the evidence could point toward factors other than drive method ruling the roost at that level.

Zaikesman,
I feel myself being pulled in your direction. I replaced nearly $10K (used value) worth of separates with a $700 integrated amp that actually sounded better. Boy did that ever feel good. I'm currently looking to see if I can accomplish something like that with my analog. That's how this thread started actually. I did something similar with speakers and cables.
Tom