Drawmer DF330 Universal Noise Filter - Manual (Page 11)

DF330 OPERATOR’S MANUAL 9
APPLICATIONS
Single ended noise reduction systems can be used extensively in all areas of music
production from tracking through to mastering and even in cassette duplication.
At the recording tracks stage, the DF330 may be used to clean up signals from an
electric guitar that is being recorded with a microphone, noisy electronic keyboard
instruments and special effects cartridge machines. The effect on noisy direct injection
guitar processors is often dramatic.
Individual mixer channels may be treated in this way or a stereo subgroup created in
which case the DF330 should be connected via the subgroup insert points and the
Stereo Link switched ON.
At the mixing stage, particularly noisy signals may again be assigned to a subgroup for
stereo processing. If conventional gates are being used on some of the tracks, then
processing all the others with the DF330 will produce incredibly quiet results, even with
a semi-pro multitrack machine.
On the other hand, it may be desirable to process the entire stereo mix, in which case
the DF330 should be connected via the master stereo insert points. If the mix is not
unduly noisy, then the Manual mode is likely to be the least obtrusive in operation. If
however, the noise contamination is severe, Auto may give the best compromise
between noise and loss of high end transparency.
For cassette duplication where the master tape is also a cassette, the DF330 can be
used to greatly increase the quality of the copies. Ideally, the master cassette should be
produced with additional brightness to compensate for loss of top in the duplication
process, but if this is not possible, the combination of a DF330 and some form of
acoustic enhancement will often solve the problem. This combination of units is also
suitable for treating old analogue master tapes to prepare digital copies for CD release
since the noise level within the DF330 is equal to that of the CD.