Turntable speed accuracy


There is another thread (about the NVS table) which has a subordinate discussion about turntable speed accuracy and different methods of checking. Some suggest using the Timeline laser, others use a strobe disk.

I assume everyone agrees that speed accuracy is of utmost importance. What is the best way to verify results? What is the most speed-accurate drive method? And is speed accuracy really the most important consideration for proper turntable design or are there some compromises with certain drive types that make others still viable?
peterayer
Please don't give up, Frogman! Let me try to continue your argument:

Emotional expression is of course very important in music. But let's take Frogman's example, a beautiful melody being played with no sense of time.

Rhythm and meter are the basic framework of all music - they are what make music intelligible to the listener. Once in a master class, a fellow hornist was playing the famous solo from the slow movement of the Tchaikovsky 5th Symphony (for those of you who do not care much for classical music, you may know the John Denver tune Annie's Song, which uses the same melody). This student was very wrapped up in her own emotions, and was too much in love with the admittedly gorgeous sound she was making, and there was absolutely no sense of time at all. Despite the emotional playing, the music simply made no sense - indeed, it would have been unrecognizable and unintelligible to anyone not familiar with what she was playing. The rest of us in the horn studio patiently waited for her to finish.

Then my teacher asked her - "What do you think I think about primarily when I play this solo in the orchestra?" The student replied "Oh, you're probably thinking about your wife, and how much you love her!" He of course replied "No, I am thinking - " and here he started chanting the subdivision of the beat, along with the comment above that rhythm and meter, and the sense of these things, are what make music intelligible to the listener, even if they are not conscious of this.

He also went on to add that no matter how expressively one plays, poor rhythm is the first thing that will get you eliminated at an audition, and this is very true, though poor intonation is a close second.

I am not arguing that one should play like a machine, however, far from it. But to be expressive with musical time, one must have an accurate sense of it first. One cannot learn to manipulate musical time expressively if one cannot give a sense of strict time. If there is no sense of meter underlying the solo, then there is no context for the listener to follow the expression. This is why just about all types of popular music have a drumbeat behind them - this gives the context or framework to the listener for everything else that is going on, even if they know nothing about music.

The student I described above was lost in her own little world - expressive as she was, her expression was only for her - there was no translation there for the listeners, even though we knew what she was attempting to convey! The sense of time is the framework the musician must set up so that he/she can be understood. This is why Frogman is arguing that this issue is so important, though I do not write as clearly and concisely as he, unfortunately.

Thuchan wrote:

He said...it doesn`t matter...I love the sound!

Oh my god...
Voila ;-)

Vbr,
Sam
Very well put, Learsfool. The importance of coherent rhythm can't be stressed enough. On a related note (and the subject of another thread), it is ironic that in spite of it's technically "superior" speed stability, digital recording technology can suffer from rhythmic blandness. It is not only rhythmic accuracy from one point in time to another that matters, but what happens in between; the motion moving away from one point in time and leading up to another. That is what gives music it's thrust and swagger.
this is almost humorous, you folks are arguing about problems the older among us had to deal with in Dual and Phillips TT's of the 70's and 80's.

If speed of a TT is constantly off the musical pitches will be off. Since all speeds are off proportionately, harmonic structure will still be intact. If its badly off the spoken/sung word will sound distorted because we are sensitive to the cadence of speech. Trying to play an instrument along with this becomes silly because you have to mistune your instrument.
If the speed is variably off that becomes wow/flutter... thats musically unacceptable.

What makes the finest turn tables is damping/filtering vibration at the micro level to prevent vibration reaching the arm and platter that would superimpose on the stylus tracked vibration, distorting the electrical signal created in the cartridge and played back as sound in your system. As an example put a vibrator on your cheek and try to sing... thats what a badly isolated TT does even with perfect speed.

You can consider direct drive the equivalent of attaching a vibrator directly to the platter... Denon tried to sell a lot of these.

Next best is belt drive... the motor still vibrates but the belt provides isolation in power transfer. But a platter mounted on same sub chassis as motor still sees vibration transfer through the chassis. Rega follows this model.

Optimal is belt drive, suspension TT where platter and arm are on an independent subchassis... both are isolated.
Linn Sondek,the AR and Sota follow this model

And there are the exotic designs ( I believe I once saw something that floated the platter suspension in the equivalent of jello)