The active Vienna Bridge Circuitry
The 4-Band Stereo Mastering Equalizer
is available from stock with 12 dB or 6 dB boost/range. Due to our rapid
manufacturing shop, custom versions are possible at short notice with
any range up to 16 dB. All 0 dB positions have center detents and are precisely
calibrated. The range around the 0 dB mark is stretched to make very small settings
The four fully parametric bands are implemented using the active 'Vienna
Bridge' circuiry by adt-audio that combines the tonal qualities of passive LC
eq's with the flexibility of an active fully parametric equalizer. Vienna Bridge
based eq's offer musical behavior, free of harshness, distortion, and similar
negative side effects even with extreme settings.
Frequency and Q-Factor Ranges
Each band has a gain control, q-factor control, center
frequency control, and a bypass switch. The sweep ranges of the bands have huge
overlaps; Low, Mid1, and Mid3 allow frequency variations of about 1 to 30 while
the High Band is focussed on the high-mid and high range with a variation from
3.2 to 24 kHz. The Stereo Mastering EQ is manually calibrated for optimum
tracking accuracy between the stereo channels. All components that affect the
tracking accuracy are handpicked.
Custom frequency and q-factor ranges are possible like custom control
ranges at short notice. It is also possible to combine 2 TM204's to an 8 band
fully parametric multiband equalizer. Due to our rapid manufacturing
capabilities, any combination is ready for shipping within 2 weeks.
Using narrow q-factor settings at the upper end of the audio band
can produce silky luster highs; a boost in the range below 60 Hz with a medium
bandwidth supports a stable bass fundamental of the mix, while narrow settings
at the base frequency of a kick drum result in high 'pressure' in the bass range
without loosing transparency at the low end.
The q-factor control range is the same for all bands and covers a
range from about 3 octaves for global corrections down to a third for subtle
Headroom & Noise
The headroom is + 30 dBu throughout the entire stereo
mastering equalizer. At linear settings, the output noise is less than -90 dBu
RMS/-94 dBA which results in a total dynamic range of at least 120 dB/124dBA.
The TM204 is a 4U ToolMod that fits into two slots of the horizontal 1U
high ToolMod Frames. The vertical version fits into a slot of a 4U
high ToolMod Frame.