1) to isolate the turntable from floor vibrations. Walking or stomping nearby, or even closing a door, can be picked up and amplified as a rather unpleasant booming low-frequency sound. And jumping hard enough nearby can even make the needle skip.
2) to eliminate the mechanical motors and thereby another source of noise or interference. All while possibly achieving better or more consistent control of rotation speed?
So, why are any such claims so scrupulously avoided? Because it doesn't accomplish either of those things? Because their experience with phonographs is so shallow they don't even know those issues people might care about? It's weird...
Eliminating needle skip was the first thing that came to my mind too, there's gotta be a reason they don't even mention it.
I think that there's a different problem for each component. The turntable introduces vibrations vertically (which seems less important to me, except it could affect stereo), and the arm introduces them horizontally.
Not sure what the weight of the platter itself is off the top of my head.
The so called "rumble filter" was a common feature of amplifiers from the 80s. Vinyl may have been reborn, but the surrounding ecosystem has not, so most "modern" record player systems are quite inferior to those of the past. Ironic.
With that, a laser or photo sensor that reads the record surface would be an advancement and preserve records from wear and tear that a stylus needle will induce.
Maybe the next version will embrace such technology.
Reference - https://en.wikipedia.org/wiki/Laser_turntable
The laser does no such thing, and so there is significantly more noise in the playback, unless your record is perfectly clean, which is essentially impossible.
It also will not play records which are colored or transparent. Only black will work.
But on a more serious note, I have always been intrigued as to why the majority of turntables still seem to rely on a belt drive system that goes back many decades. Surely modern technology has come up with a reliable direct drive motor that can better regulate the torque and RPM requirements of the platter, as well as offer better stability?
Is it similar to the 'digital versus vacuum tubes' type arguments that are prevalent on guitar amp discussion forums?
Direct drive is certainly better and more reliable than any belt system. Very low flutter and wow.
The whole thing about cogging in DD turntables was a rumor started by European boutique manufacturers, because they couldt compete with the R&D budgets and engineering employed by big companies like Technics/National, Sony, Denon, CEC, Pioneer, Mikro Seiki and others. It's a non-issue on any decent DD table.
Cogging only happens in bargain basement tables, such as the cheapest modern USB lightweight plastic DJ-marketed tables. Super OEM tables are fine though.
Many people don't realize that you can turn a technics 1200/1210 into a great hi-fi turntable. They are highly upgradable.
People just assume because these decks were designed for DJ'ing they can't possibly sound good.
I used to be a member of this forum: https://theartofsound.net. There are guys on there who have spent a few thousand upgrading their technics. New tonearms, platters, motors, and other stuff. And they thought their upgraded 1200/1210 sounded better than belt drive decks which were 4X or 5X more expensive.
I have an upgraded Technics Mk5. I've only spent a few hundred on it but it's the best sound deck I've ever heard.
As much as I'm liking sounding like I have a clue about the theorem… my brother had a Levitron and I played with it.
Edit: Although reading the wiki link, it sounds more like the instability was just due to it requiring a very specific speed.
Looks cool. I don't know why anyone would spend so much money on such an outdated technology, though.
I also certainly remember magnetic levitating AV stands to minimise distortion. It was a bit of a gimmick, given the cables would still introduce vibrations. But I’m sure some people paid big dollars for them.
That's a lot of trouble to go to merely visually enhance the audio experience.
I would have been more interested in a design which levitated the tonearm, allowing for less drag as the tonearm pivots.
They're being quite honest.