Re: Friday Night in http://www.dslreports.com/forum/r20245198 en Tue, 08 Jul 2008 23:14:26 EDT Tue, 08 Jul 2008 23:14:26 EDT Re: Friday Night http://www.dslreports.com/forum/remark,20262168 birdfeedr :
said by MrMoody See Profile :

Right, and a good example of why Wikipedia is not an authority.

33-1/3 was chosen originally to make 1 inch of grooves at 100 grooves per inch (the effective pitch of the screw driving the recording needle times the gearing) take exactly 3 minutes. At exactly 1.8 seconds per revolution, it's also exactly 108 cycles per revolution at 60 Hz and 90 cycles per revolution at 50 Hz which may have had something to do with the choice as well. It was designed in the 1920s for film soundtracks, and the exact power frequency multiple might have made it easier to adjust the speed in both Europe and the States.
Wikipedia isn't an authority, but I like it for it's fair presentation, and the fact that it continues to evolve.

Except for the quote (which was not in the proper context for this discussion) in my original post, all the rest was my own thoughts re: the physics of recording and playback, and why the 33-1/3 was originally chosen. I got the relative velocities backwards, not the wiki.

Your explanation makes more sense, and it's why I will treat it as authoritative, until something more authoritative comes along. :D

Thanks for sharing your knowledge.]]> http://www.dslreports.com/forum/remark,20262168 Tue, 01 Apr 2008 06:33:34 EDT Re: Friday Night http://www.dslreports.com/forum/remark,20245747 sansri88 : They're just Mp3s...]]> http://www.dslreports.com/forum/remark,20245747 Sat, 29 Mar 2008 01:10:09 EDT Re: Friday Night http://www.dslreports.com/forum/remark,20245717 aaron83_01 : I was referring to the source format, not the connections.]]> http://www.dslreports.com/forum/remark,20245717 Sat, 29 Mar 2008 01:02:43 EDT Re: Friday Night http://www.dslreports.com/forum/remark,20245526 sansri88 : My computer is hooked up to my AV receiver via Toslink. ]]> http://www.dslreports.com/forum/remark,20245526 Sat, 29 Mar 2008 00:15:34 EDT Re: Friday Night http://www.dslreports.com/forum/remark,20245407 supergirl : sansci88, when are the Yanks going back to the World Series? :D]]> http://www.dslreports.com/forum/remark,20245407 Fri, 28 Mar 2008 23:49:46 EDT Re: Friday Night http://www.dslreports.com/forum/remark,20245198 MrMoody :
said by Meh37 :

Actually, it's the reverse. An LP spins with a constant angular velocity (RPM remains a constant 33 1/3), so the outer edge moves faster than that near the center. The linear velocity decreases as the needle moves from the edge to the center.
Right, and a good example of why Wikipedia is not an authority.

33-1/3 was chosen originally to make 1 inch of grooves at 100 grooves per inch (the effective pitch of the screw driving the recording needle times the gearing) take exactly 3 minutes. At exactly 1.8 seconds per revolution, it's also exactly 108 cycles per revolution at 60 Hz and 90 cycles per revolution at 50 Hz which may have had something to do with the choice as well. It was designed in the 1920s for film soundtracks, and the exact power frequency multiple might have made it easier to adjust the speed in both Europe and the States.
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The public is a poor business manager.]]> http://www.dslreports.com/forum/remark,20245198 Fri, 28 Mar 2008 23:07:40 EDT Re: Friday Night http://www.dslreports.com/forum/remark,20244982 aaron83_01 :
said by sansri88 See Profile :

Hellz yeah man! Blasting music on my 5.1 channel surround system is amazing!
Only if it's SACD or DVD-A. Pseudo-surround is lame.]]> http://www.dslreports.com/forum/remark,20244982 Fri, 28 Mar 2008 22:30:07 EDT Re: Friday Night http://www.dslreports.com/forum/remark,20244423 anon :
said by birdfeedr See Profile :

Remember the velocity of the medium is faster in the center than the edge.
Actually, it's the reverse. An LP spins with a constant angular velocity (RPM remains a constant 33 1/3), so the outer edge moves faster than that near the center. The linear velocity decreases as the needle moves from the edge to the center.]]> http://www.dslreports.com/forum/remark,20244423 Fri, 28 Mar 2008 20:55:31 EDT Re: Friday Night http://www.dslreports.com/forum/remark,20244213 sansri88 : Hellz yeah man! Blasting music on my 5.1 channel surround system is amazing!]]> http://www.dslreports.com/forum/remark,20244213 Fri, 28 Mar 2008 20:22:40 EDT Re: Friday Night http://www.dslreports.com/forum/remark,20244192 birdfeedr :
said by backfeed See Profile :

Did you ever wonder who decided that it had to be 33 & 1/3??..why not just 33??...There probably is a story...maybe a good one for Friday night!!! :)
This is why wikipedia is my next favorite source to google. »en.wikipedia.org/wiki/Gramophone_record

33 1/3 was probably determined by an engineer who had to balance the physical characteristics of recording and playing back a vinyl disk with the desired sound characteristics. Remember the velocity of the medium is faster in the center than the edge.

Too fast in the center and the needle would jump the groove or have to track heavier with more wear. Too slow on the outside and you would lose the higher frequency characteristics in the recording.

The 16 2/3 were very slow, only good for spoken word recordings.

Added: from the wiki: ..."frequencies as low as about 0.5 Hz (the frequency at which a 33+1/3 rpm record turns on the turntable)". It's definitely a calculation. 0.4998 Hz at 33 rpm is not nearly as elegant. :D]]> http://www.dslreports.com/forum/remark,20244192 Fri, 28 Mar 2008 20:19:14 EDT Re: Friday Night http://www.dslreports.com/forum/remark,20244187 backfeed : I am jamming to Rhapsody tonight.....Music is a good thing on a Friday night...don't you think???
:) :) :D :) :)
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ERROR: Out of Memory... Should I forget Something (Y,y)?]]> http://www.dslreports.com/forum/remark,20244187 Fri, 28 Mar 2008 20:18:02 EDT Re: Friday Night http://www.dslreports.com/forum/remark,20243924 sansri88 : I'm too young to have vinyl albums. I spend my money elsewhere.]]> http://www.dslreports.com/forum/remark,20243924 Fri, 28 Mar 2008 19:28:32 EDT Re: Friday Night http://www.dslreports.com/forum/remark,20243913 vaxvms : Only if you used a USB turntable to record the vinyl albums to your computer.
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Nothing lasts forever. Where do I find nothing?]]> http://www.dslreports.com/forum/remark,20243913 Fri, 28 Mar 2008 19:26:17 EDT Re: Friday Night http://www.dslreports.com/forum/remark,20243818 anon : 16 (and 2/3)? For music? Were there such beasts?]]> http://www.dslreports.com/forum/remark,20243818 Fri, 28 Mar 2008 19:18:35 EDT Re: Friday Night http://www.dslreports.com/forum/remark,20243830 sansri88 : I'm just listening to my Beatles collection on my computer...

Does that count?]]> http://www.dslreports.com/forum/remark,20243830 Fri, 28 Mar 2008 19:12:46 EDT Re: Friday Night http://www.dslreports.com/forum/remark,20243786 backfeed :
said by vaxvms See Profile :

What speed? 78, 45, 33 1/3 or 16?
Did you ever wonder who decided that it had to be 33 & 1/3??..why not just 33??...There probably is a story...maybe a good one for Friday night!!! :)
--
ERROR: Out of Memory... Should I forget Something (Y,y)?]]> http://www.dslreports.com/forum/remark,20243786 Fri, 28 Mar 2008 19:06:13 EDT Re: Friday Night http://www.dslreports.com/forum/remark,20243720 vaxvms : What speed? 78, 45, 33 1/3 or 16?

edit:
oops! 16 2/3]]> http://www.dslreports.com/forum/remark,20243720 Fri, 28 Mar 2008 18:54:41 EDT Friday Night http://www.dslreports.com/forum/remark,20243640 SimbaTLK1 : If you've got nowhere to be, put a good record on the turntable and listen to what real music sounds like. :D

Happy Friday,
Matt]]> http://www.dslreports.com/forum/remark,20243640 Fri, 28 Mar 2008 18:42:21 EDT