 |
 |
It may not be the laptop electronics. One variable is the read drive. Various players react to media defects in different ways. High speed CD-R recording and poor quality media are just a few sources of defects. If you wish, Media Sciences will perform a quick test on one CD-R at no charge. Just follow instructions at http://www.mscience.com/test.html#FRETST Jerry Media Sciences, Inc. > -----Original Message----- > From: Association for Recorded Sound Discussion List > [mailto:[log in to unmask]] On Behalf Of gary atkinson > Sent: Friday, May 15, 2009 1:51 PM > To: [log in to unmask] > Subject: Re: [ARSCLIST] Technics SP-15 to computer nightmare > > Hi Bob, > > It's an interesting point that you raise but I feel sure that this can be > eliminated. > > As everyone in the group may have guessed by now, I am no technician. As > far > as gear is concerned, in this exercise, I have tried to avoid relying > totally on the desk top computer that these recordings end up in, where > they > are then worked on using restoration software. I did this because of a > tiny > amount of interference from within the computer to the restoration > software. > To do this I have linked the Technics to a NAD amp which then takes it to > a > Tascam CC-222SL Tape / CD recorder. (I initially linked the Technics > straight up to the RIAA inputs in the Tascam but even when the meters both > on the Tascam and at the same time in the restoration software, as could > be > seen on the computer screen, showed no clipping, the gain was far too > strong, even with the input signal turned way down on the Tascam)From the > Tascam the signal is then sent to an interface (I have used both an old > Edirol UA-5 and a Noi 2/4 with the same results) from the interface the > signal then goes straight to restoration software. All the way along I > have > intercepted with headphones and checking that extraneous sound such as hum > is not present. I have also flattened the meters to zero with test runs on > both the lead in and lead out of the records. The checks show that > everything is fine and everything goes fine throughout the transfer, > restoration etc... other than the laptop playback test. > > Some interesting points have been raised by the group and I am now > scouring > the internet and reading about playback problems that DELL Laptop owners > have and there seem to be quite a few yet I still cannot put my finger on > the "some tracks on a CD play OK / Some tracks on the same CD don't play > OK" > on the laptop teaser. Maybe I have missed the point or answer from > previous > responses to my dilemma. Perhaps, because I am not a technician I am > looking > at a problem which just has to be and I don't know enough to realise that > there is no solution. > > Gary. > > > -----Original Message----- > From: Association for Recorded Sound Discussion List > [mailto:[log in to unmask]] On Behalf Of Robert Cham > Sent: 15 May 2009 18:06 > To: [log in to unmask] > Subject: Re: [ARSCLIST] Technics SP-15 to computer nightmare > > > FWIW. This may not relate to anything going on here. Direct drive > turntables all have, sometimes substantial,rumble. The difference > from a rim drive turntable is that the direct drive turntables, such > as the SP 15 rumble at such a low frequency as to be inaudible. I do > know of situations where they used up all the headroom in direct > coupled amplifier, with just the rumble. I believe the Thorens is a > belt drive table. That's what made me think of this > > Not knowing your equipment, I don't really know if something like > this could be going on here. As I said, FWIW. > > Bob Cham > > >Hi, > > > >Although my problem with the transfer of 78s are nearly over, it would > >seem I am not quite out of the woods yet and I would really appreciate > >any explanations or suggestions on why it is that all tracks on CDs, > >other than those produced from the Technics SP-15 are playing OK on a > >laptop. I am now in a situation where the Technics tracks are playing > >perfectly everywhere, including the desktop computer. However, a CD > >made of assorted tracks produced by other sources, including vinyl on a > >Thorens, played on the laptop plays fine other than when it comes to > >the Technics tracks. Evidently, it is the only piece of equipment left > >which is not happy with these recordings and distorts when playing > >them. > > > >Like Malcolm, I record these tracks in stereo, something that has not > >given any problems in the past on any machine. Volumes are set O.K., no > >clipping. Before recording, checks are made with all equipment involved > >and there are no hints, either visibly on meters or audibly through > >headphones, that there are any extraneous noises such as hums or > >crackles. No distortion can now be detected at any stage during > >previews before transferring. > > > >For me, the most puzzling thing is that recording singles from the 50s > >on the Thorens proves to be fine when played back on the laptop, > >substituting the Thorens with the SP-15 to record 78s from the 50s (not > >that date really > >matters) produces distortion on the laptop. The laptop, by the way, is a > >DELL > > > >I appreciate a comment made earlier from the group that I shouldn't > >worry too much about one piece of equipment being happy with this but > >this part of a mastering process for commercial production and all > >common possibilities of machines (and a lot of people listen to CDs in > >their laptops) that would be used to play this on must pass the test. > > > >Any explanations or suggestions greatly received. > > > >Gary.