Crest Audio SmarTube ST2, Руководство пользователя

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4
HIGHLIGHTS:
• Two separate full channel strips in a single rack-space unit
• Front panel Mic/Line jacks
• Separate Insert Send and Return jacks
• Solid-state tube-sound processor (SmarTube
™ )
• Expandability – Daisy-chaining of multiple units
• Affordability
• Multicolor LED meters
• Full parametric EQ
• 24 dB/oct LCF
• "Sizzle" control
• Balanced and Unbalanced I/O
ELECTRICAL DESCRIPTION:
Each of the two input channels (1 and 2) has an XLR low impedance (2.2 k Ohm) microphone and a
high impedance (200 k Ohm) 1/4" line/instrument(DI) input with jacks conveniently located on the
front panel and duplicated on the rear panel. Both inputs have separate gain controls with wide gain
range (Microphone: 0-60 dB and Line: OFF to +10 dB). The Mic input has a –20 dB Pad switch; a
Phase-reverse (polarity) switch; a +48 V phantom power switch with LED; and a switchable, forth-
order high-pass filter with 24 dB/oct slop and 75 Hz corner frequency. An Insert Unbalanced I/O with
separate 1/4" Send and Return jacks is provided on the back panel. Equalization consists of a
shelving Low and High section and two fully adjustable parametric filters. The Low and High
shelving is a Baxandall type EQ with 80 Hz and 12 kHz corner frequencies. The Low-Mid parametric
section is a symmetrical, bell-shaped type and provides a +/-15 dB boost/cut within the frequency
range 100 Hz ~ 3 kHz and bandwidth range 2 ~ 1/5 octaves. The High-Mid EQ sections have
identical characteristics with the exception of the frequency range, which in this case is 500 Hz ~
15 kHz. The Level control ranges from OFF to +6 dB. The Pan control directs the signal between A
and B summing bus when the Stereo/Mono switch is disengaged. The SmarTube control blends the
signal between the main channel with the signal after the tube-sound processor circuit and ranges
from clean to all-tube-sound. The purpose of the tube-sound circuit is to replicate the characteristics
and the sound quality of a microphone tube amplifier by introducing the harmonics structure typical
for a tube stage. This circuit utilizes solid-state technology. A bicolor LED is provided to indicate that
the tube-sound processor is active (green) or overdriven (red) to maintain a balanced sound quality.
The Sizzle switch introduces a slight (3 ~ 4 dB), broadband boost within the high frequency range.
The Mute (red LED) switch mutes all channel outputs and the meter. The output channel signal is
monitored via 10-segment, multiple color LED array with –21 dB to Clip (2 dB before clipping) range.
A separate, green Signal LED indicates the presence of a signal (-20 dBu) through the channel,
regardless of the Mute switch position.