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TUBE ULTRA-Q T1951
Because of the wide overlap possibility of the different filters, the effect of two filters can be added together if so
desired. This way an even greater attenuation or boost can be achieved.
When notching out frequencies try to make the band as small as possible. Always as little as possible but as
much as needed.
3.2 Shelving filters and Roll Off
Switching one or two of the outer filters to SHELF enables you to adapt or limit the entire frequency response.
With the LEVEL control you can set the degrees of boost or attenuation, with the BANDWIDTH control the
slope and with FREQUENCY control the frequency from which the slope starts.
Practice has shown how important this feature is, as most acoustic problems are encountered in the extreme
low and high frequency ranges. Typical frequency response, hum or feedback problems must be handled
differently. The additional low and high shelving filters allow for a broad-band correction of the frequency curve,
while the parametric filters can be used to process narrow frequency bands (mains hum, feedback, etc.).
Fig. 3.2: Typical roll-off function
With roll-off we usually refer to a limitation of frequency bands by means of high or low pass filters.
If you set the LEVEL control at -15 dB, the BANDWIDTH control fully left and the FREQUENCY control
somewhere between 50 and 100 Hz, you have a very steep low-cut filter. This will eliminate rumble and
breathing noises very effectively without affecting the sound.
At the high cut side you can reduce tape hiss for example. Use this feature with caution however to prevent the
material from becoming muffled or sharp. It is advisable to use a dedicated denoiser like the BEHRINGER
MULTIBAND DENOISER SNR2000 to effectively eliminate tape noise. The TUBE ULTRA-Q is well suited for
in-the-field problem solving when unexpected hiss arises.
3.3 Equalizers as creative audio tools
The TUBE ULTRA-Q is an indispensable audio tool for application in recording studios, stage plays or radio
dramas. You can use it to distort voices, create telephone sounds and filter instruments to make them fit into
the mixdown.
The charts printed below give you some clues as to the acoustic significance of specific frequencies. Please
use them as suggestions for your own experiments with the TUBE ULTRA-Q.
3. APPLICATIONS
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