Hi, Jerry,

As I'm sure you noted after Scott Phillips's informal test, the 
discussion said that degaussing will CHANGE the sound, not make it better.

I am with Scott's analysis as we know that currents induced in 
aluminum disks are real as that's how the watt-hour meters 
(pre-all-solid-state) at your power service work.

I think it's funny that the degaussing of the optical discs is 
considered an improvement. A similar technique is used at check-out 
stands in stores to "blow" the shoplifting protection "resonators" 
that trigger the alarms as you leave. Ever have them not degauss 
them? Scenes of pulling out the receipt and showing it to the guard. 
They warn you not to put your credit card (with mag stripe) near the 
disarming station.

Many faults seem to come back to poor power supply design / power management.



At 08:28 AM 2008-01-23, Jerry Hartke wrote:
>Some writers have technical skills, while others spin out profitable junk
>for acceptance by gullible editors and readers. De-gaussing (there are no
>ferromagnetic materials in a disc), polishing (introduces millions of
>microscratches that distort the laser beam), and trimming (can worsen track
>eccentricity or unbalance), have the potential to degrade, but not improve,
>CD or DVD disc quality. If this remains an issue, Media Sciences would be
>glad to participate in a controlled test on a few discs, both before and
>after the "improvements", at no charge and then publish the results online.
>Please contact me if you wish to participate.
>As stated, power demands by optical drive servos can generate adverse
>feedback to a DAC through the power supply.

Richard L. Hess                   email: [log in to unmask]
Aurora, Ontario, Canada       (905) 713 6733     1-877-TAPE-FIX
Detailed contact information:
Quality tape transfers -- even from hard-to-play tapes.