3.
Carefully adjust the "QUIETING" control for maximum reduction of noise
possible without introduction of distortion.
4.
If you notice distortion during loud peaks of sound, advance the "DISTORTION
LIMITING" control further till the "THD" LED illuminates and thus inhibits the
"NOISE REDUCTION" LED and the resultant distortion. This may require
careful adjustment of both controls and some interaction will be observed.
5.
If the “THD” LED blinks on clicks and pops, it is adjusted too high. The “THD”
LED should only rarely come on if at all.
HINTS
1.
Note: In some rare instances, noise reduction will have to be severely
compromised in order to prevent distortion. Certain discs contain an extremely
low level of very fine ticks. Some discs display some distortion from worn groove
walls and exhibit a “fuzzy” sound. These may cause the unit to trigger
unnecessarily and attempt to remove the above characteristics with
unsatisfactory results. Such cases will require critical adjustment and
compromise.
2.
When using single channel sources, as from a tape recording where the source
is identical mono from both tracks, only one channel must be connected to the
Surface Noise Reducer explained under "connection." In that instance, very
careful adjustment of the controls will be necessitated.
3.
The Surface Noise Reducer can also be used with stereo FM tuners in order to
remove ignition and atmospheric noise. Employ the same adjustment
procedure.
4.
As a final suggestion, let your ears determine the exact setting of the controls
and use the LED indicators only as guide for approximate settings.
OPERATION WITH VINTAGE RECORDS
1.
Do not expect the same degree of noise reduction as that obtained from LP's.
As the quantity of impulse noise is several orders of magnitude greater, we must
focus on the more discernible clicks.
2.
A certain degree of "frying bacon" crackle can be removed by careful adjustment
of both controls. It may be necessary to adjust the controls for different parts of
the record. This is especially useful if taping and then editing the recording.
PROBLEMS
If no noise reduction is observed, check the following
: 1) “THD” control set too high. 2)
There is a “mono” connection ahead of the SNR. Make sure you can play stereo
