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Our take:

We love its high-end quality and military spec construction, the amazing versatility it offers by allowing to choose between tube or Solid state path for each stage individually: preamp, EQ and compressor.

We have been paring it with certain tube condenser mics and the combination provided us with all we were ever looking for in terms of sound.

overview:

Microphone Preamplifiers & General:
Twin Topology Mic Preamplifier Selection Switchable, Vacuum Tubes or Solid-State
Twin Topology EQ & Compressor Switchable, Vacuum Tubes or Solid-State
Twin Topology Input Coupling

Switchable, Transformer or Transformerless
Maximum Output Level (Balanced) + 32 dBu
Frequency Response
+0 / -3 dB (S/S)
sub 5 Hz to beyond 300 kHz
Equivalent Input Noise -131 dBu (SS, Common Source, Direct Out)
THD + Noise
20 Hz – 22 kHz (S/S)

< .05 %, typ < .003 %
Common Mode Rejection Ratio (S/S) > 40 dB, Typ > 70 dB @ 60 Hz.
Input Impedance (Mic) 6,200 ohms
Input Impedance (Line) 2,200 ohms (x2)
Input Impedance (Di – Instrument) > 1 megohm
Output Impedance (Balanced) 24.3 ohms (x2)
Parametric Equalizer:
Maximum EQ Boost/Cut Range (21 Step Detented) +/- 15 dB
EQ Frequencies
Low Range Switch (Centers – Peak/Shelf Selectable):
20, 34, 56, 100, 180, 270
Low Mid Sweep:
20 Hz – 220 Hz or 200 Hz – 2.2 kHz.
10X Range switch selectable.
Hi Mid Sweep:
250 Hz – 2.5 kHz or 2.5 kHz – 25 kHz.
10X Range switch selectable.
High Range Switch (Centers – Peak/Shelf Selectable)

4.8 k, 5.8 k, 8.0 k, 10 k, 16 k, 21 k
“Q” Range Q = 0.4 to 4.0 Adjustable on middle ranges
Q = 1.0 Fixed on low & high ranges
Optoelectronic Compressor/Limiter
Threshold Range Infinite to +20 dBu
Attack Range 2 ms to 100 ms
Release Range 80 ms to 3.0 s
Compression Ratio Range minimum 1.4 : 1, maximum 30 : 1
De-Essing Frequency Switch OFF, 4.9 k, 6.8 k, 8.2 k, 10.7 k , 12.0 k
Power Consumption 50 watts maximum
Power Requirements Selectable: 100-120, 200-240 V ac, 50/60 Hz
Dimensions/Shipping Weight 19” W x 3.5” H x 15.5” D, 25 lbs.