belt drive cd transports

[mjb]

what is the reasoning behind using a belt-driven cd transport which differentiates it from a direct/gear-driven transport? is it one of those "isolation" things? which i guess leads to the next question... i understand when it comes to tubes and cartridges, but how can minor/micro vibration have any affect on digital?

thanks,

mjb

[Pars]

IMO it is audiophool bullshit. CDs do not travel at a constant RPM, at least according to this:

Revolutions per minute - Wikipedia, the free encyclopedia

These drives play off the belt drive turntable reputation. Since turntables DO travel at a constant rate of 33 rpm (or 45, etc.), there is merit in the use of a belt drive here. But not so much in a device that must change speeds, which a belt drive is not as good at as direct drive. Some people do swear by them though (CEC is it?).

[cetoole]

Yeah, CDs basically couldnt be constant RPM. Its not like they get progressively tighter data encoding on there. Plus, any half decent transport buffers the disc read.

[swt61]

I'm designing a transport that uses anti-gravity to keep the disc spinning at a constant rotational speed, with no motor noise or wow and flutter. So far so good, but the cost of having to fly above the Earth's atmosphere to listen to it may hurt the sales projections.

[Hopstretch]

I'm designing a transport that uses anti-gravity to keep the disc spinning at a constant rotational speed, with no motor noise or wow and flutter. So far so good, but the cost of having to fly above the Earth's atmosphere to listen to it may hurt the sales projections.

OK, not anti-gravity, but the motor does drive the platter without being physically connected to it in any way.

[swt61]

Magnets?

Frickin' tasty lookin' table!

[Dreadhead]

You mean the $$$$$ teac transport is just audiophool bs? Please say it aint so

[feckn_eejit]

think the teac VRDS is another sort of beast, not belt driven...

i do have one belt-driven transport (C/BD-2000)... it does sound very unique... strangely, more "analogue" than the rest of 'em. very smooth with great midrange. top end sounds weird and bottom has no impact. observations confirmed by multiple totally uninterested female parties.

have always suspected a clock upgrade would really help this one. haven't tried again since acquiring digital lens...

theory is the weight of the cd/heavy puck mechanism coupled with the isolation of the belt shields the rotating mass from wow/flutter/pulses caused by the motor, thus providing the frickin' laser beam with a "more perfect"ly smooth read on the pits and lands. *shrug*

[Hopstretch]

observations confirmed by multiple totally uninterested female parties.

have always suspected a cock upgrade would really help this one.

FTFY.

[feckn_eejit]

FTFY.

...little weird as one of them was actually my youngest sister... otoh another was an ex so you may be onto something... *sigh*

[swt61]

...little weird as one of them was actually my youngest sister... otoh another was an ex so you may be onto something... *sigh*

What's weird about that?

Oh wait, I'm in the South! Damn I keep forgetting that!

[feckn_eejit]

ba-dum PSHT!

[Sherwood]

All that power, Steve, and you use it for incestuous evil?

[grawk]

Alaska rubbed off on him, so to speak.

[Sherwood]

Makes sense, seeing as he no doubt rubbed it out in truck stops all over Alaska.

[swt61]

A guy's gotta stay warm some way.

[Smeggy]

I thought you guys snuggled up to the nearest moose.

[grawk]

moose are a great fight, but not so cuddly.

[swt61]

There are probably more deaths from Moose than Bears. They're very unpredictable. I did have a really friendly young bull Moose that slept in my back yard all Winter.

[Sherwood]

I would selectively quote the above, but it is just too awesome for that. Nothing like watching a bull moose wake up while drinking a cup of coffee in a flannel robe. Does the sun rise up there during the winter? In my head there's a sunrise.

[grawk]

Fairbanks gets about 4-5 hrs of daylight during the winter

[guzziguy]

One has to get above the Arctic Circle in Alaska to have no sunrise in the winter.

[swt61]

4-5 hours for the shortest days in Anchorage.

I would go out into the back yard and talk to this particular Moose. He seemed to like that. He'd get about 4' from me, and just watch my every move. He was raised in the downtown area. His Mother visited my yard often when he was just a few weeks old. The big Cottonwood tree in my backyard was his bed. Well under the tree that is.

[Dusty Chalk]

So Sunrise would take about 2-2.5 hours? And above the arctic circle, it could take days on the longest "days" (what are days based on sunrise/sunset called -- solar days?)?

[Sherwood]

I like that should I wish to keep up with this interesting and enjoyable discussion on Alaskan winters, I need to go to page two of the thread on belt drive CD transports. Hooray for off-topic.