Dear friends: I think that Johnnantais is right in many ways and I agree with him in many issues.
His Gallileo, Bacon, etcc references, are a way to dramatize a fact that the 99% of the people " can't see it " or does not " want to see it ".
Opalchip do serious statements about what exactly is the job of a TT for to know what can we expect from a TT : +++++ " What exactly does a turntable do? It's a platter spun by a motor that we put a record on. The ABSOLUTE BEST thing it can do is turn at an accurate, highly constant 33rpm and not impart any vibration to the lp. It cannot "add" anything positive to the playback. " +++++
Any one of you have to agree with those statements, especially: ACCURATE AND HIGHLY CONSTANT SPEED ( 33/45rpm in the short and long run ).
Here the idler/DD TT's beats any belt drive design ( including the Walker ). I own four belt drive TTs, three SP 10MK2, two DP80s and one DP75 Denon's. In the past I was owner of: SP10MK3 and a Denon DP 100 ( please don't ask why I don't own today these two TTs. I don't want to remember it ).
The idler/DD servo TTs are dead steady on the rpm issue. The motor in the DD TT is really a tour de force, at least in the DD models that I own.
The pitch in the music reproduction in a home audio system is the most critical subject for a right musical appreciation. Any small variation in the TT speed change the pitch and change totally what we are hearing.
The problem in the belt drive systems is in the belt drive it self ( not in the small motors that are using ), all kind of belt drive materials: kevlar, nylon, silk, rubber, etc., have the tendency to stretch ( every single second that are in use ), is this tendency to stetch what do almost impossible to mantain a constant speed. The DD drive servo TTs don't have to fight with this critical issue and don't have that little speed variations that the belt drive have: especially in the short run, that is where really is important. Now, it is not only the stretch tendency on the belt drive system what is a critical issue there are other critical issues in a belt drive systems, like: changes in the room temperature, changes in the room humidity, the pulley and platter friction with the belt, the pulley/platter build imperfections, etc...
This single subject: " ACCURATE AND HIGHLY CONSTANT SPEED ", ( where everything the same ) do the difference between a belt drive system against a DD system, where the DD system beats the belt drive system.
Johnnantais don't have to go so far away: the best TT system is the Rockpor Sirius, this 70K+ " baby " use a DD system: wonder why? Don't you think that if the " experts belt drive system " was the better Rockport would had choose it?
The three belt drive systems TTs that are in my current audio system are very good on the speed issue but aren't perfect: I'm checking every day and some days after/before every listen record the speed variation.
There are many issues of the why's many of us and all the " reviewers/experts " are using belt drive systems: but this situation is only circunstantial and does not means that the belt drive system is better than the direct drive system, because it's not.
Regards and enjoy the music.
Raul.
His Gallileo, Bacon, etcc references, are a way to dramatize a fact that the 99% of the people " can't see it " or does not " want to see it ".
Opalchip do serious statements about what exactly is the job of a TT for to know what can we expect from a TT : +++++ " What exactly does a turntable do? It's a platter spun by a motor that we put a record on. The ABSOLUTE BEST thing it can do is turn at an accurate, highly constant 33rpm and not impart any vibration to the lp. It cannot "add" anything positive to the playback. " +++++
Any one of you have to agree with those statements, especially: ACCURATE AND HIGHLY CONSTANT SPEED ( 33/45rpm in the short and long run ).
Here the idler/DD TT's beats any belt drive design ( including the Walker ). I own four belt drive TTs, three SP 10MK2, two DP80s and one DP75 Denon's. In the past I was owner of: SP10MK3 and a Denon DP 100 ( please don't ask why I don't own today these two TTs. I don't want to remember it ).
The idler/DD servo TTs are dead steady on the rpm issue. The motor in the DD TT is really a tour de force, at least in the DD models that I own.
The pitch in the music reproduction in a home audio system is the most critical subject for a right musical appreciation. Any small variation in the TT speed change the pitch and change totally what we are hearing.
The problem in the belt drive systems is in the belt drive it self ( not in the small motors that are using ), all kind of belt drive materials: kevlar, nylon, silk, rubber, etc., have the tendency to stretch ( every single second that are in use ), is this tendency to stetch what do almost impossible to mantain a constant speed. The DD drive servo TTs don't have to fight with this critical issue and don't have that little speed variations that the belt drive have: especially in the short run, that is where really is important. Now, it is not only the stretch tendency on the belt drive system what is a critical issue there are other critical issues in a belt drive systems, like: changes in the room temperature, changes in the room humidity, the pulley and platter friction with the belt, the pulley/platter build imperfections, etc...
This single subject: " ACCURATE AND HIGHLY CONSTANT SPEED ", ( where everything the same ) do the difference between a belt drive system against a DD system, where the DD system beats the belt drive system.
Johnnantais don't have to go so far away: the best TT system is the Rockpor Sirius, this 70K+ " baby " use a DD system: wonder why? Don't you think that if the " experts belt drive system " was the better Rockport would had choose it?
The three belt drive systems TTs that are in my current audio system are very good on the speed issue but aren't perfect: I'm checking every day and some days after/before every listen record the speed variation.
There are many issues of the why's many of us and all the " reviewers/experts " are using belt drive systems: but this situation is only circunstantial and does not means that the belt drive system is better than the direct drive system, because it's not.
Regards and enjoy the music.
Raul.