Focusrite TwinTrak Pro Preamplifier Channel Strips B-Stock

A B-Stock is a like new, refurbished unit. It has been fully tested by the facotry to meet its original stardard with a seal of approval from the manufacturer. B-Stock unit has been made as close to new as possible. It comes with the same warranty as a brand new unit. Most of B-Stock units comes with brand new manual, software (CD) and accessories.

Focusrite TwinTrak Pro

 is designed principally as an affordable, high-specification dual mono/stereo tracking device. Focusrite TwinTrak Pro also boasts comprehensive latency-free monitoring, unmatched digital connectivity, and all within a sturdy 2U 19" rack-mount chassis.

Each channel of Focusrite TwinTrak Pro features Focusrite's award-winning Platinum preamp, embellished with the option of instant "air" and variable input impedance for improved microphone performance and extended creativity. A mid-scoop EQ follows, and provides variable frequency and depth of cut for vocal problem solving and miked-up cabinet ambience.

A Focusrite favorite is TwinTrak Pro's powerful dual mono/stereo optical compressor. This Focusrite TwinTrak Pro's optical compressor features Focusrite's custom fast-acting optos, alongside side-chain inputs and the ability to operate as a true "twinned" stereo pair. These circuit design innovations of Focusrite TwinTrak Pro are complemented on the TwinTrak Pro by a comprehensive set of focussed controls.

Focusrite TwinTrak Pro is the first Platinum Series processor to feature a D/A converter as standard, alongside Focusrite TwinTrak Pro's optional analogue to digital converter. The D/A converter enables the user to feed mono or stereo digital signals into TwinTrak Pro. These signals can be fed either into the stereo latency-free monitoring section, or via line inputs (after the preamp stage) for further processing. The signal can then return to the digital audio workstation via Focusrite's established stereo A/D converter option.

Together, these facilities make TwinTrak Pro the perfect analog interface for any digital audio workstation, and equally one of the world's finest "hardware plug-in".

2 award-winning Class A discrete transistor-based preamps

Focusrite TwinTrak Pro dual mono/stereo optical compressor, featuring custom fast-acting optos

Latency-free monitoring with total control over balance, effects, mix and monitor levels

24 bit/192 kHz D/A fitted as standard, for processing digital signals or feeding digital signals into the monitoring path

An optional 24 bit/96kHz A/D. Both the A/D and the D/A feature Word Clock (BNC)

Inductor-induced "Air" opens up high frequencies like an expensive transformer-balanced pre amp

Variable impedance for improved microphone performance and extended creativity

Mid-scoop EQ for correcting problematic mid frequencies

Direct inputs on the front panel for both instruments (jack) and microphones (XLR)

Post preamp inserts and compressor sidechain inserts, for enhanced processing flexibility

2 ocean blue peak-reading meters, ideal for catching fast transients

Mic Input Response

Gain range = 0 dB to 60 dB continuously variable
Input impedance = 50 Ohm to 3K3 Ohmcontinuously variable
EIN = 128 dB measured at 60 dB of gain with 150 Ohm terminating impedance and 20 Hz/22 kHz bandpass filter
THD at minimum gain (0 dB) = 0.0004% measured with +16 dBu input signal and with a 20 Hz/22 kHz bandpass filter
THD at maximum gain (60 dB) = 0.003% measured with a -36 dBu input signal and with a 20 Hz/22 kHz bandpass filter
THD at maximum input level (26.5 dBu) = 0.005% measured with a 20 Hz/22 kHz bandpass filter
Frequency response at minimum gain (0 dB) = flat at 10 Hz and -2 dB down at 200 kHz
Frequency response at maximum gain (60 dB) = -2 dB down at 10 Hz and 200 kHz
CMRR at full gain (60 dB) = 80 dB
Line Input Response

Gain range = -10 dB to +10 dB continuously variable
Input impedance = 10K Ohm from 10 Hz to 200 kHz
Noise at main output with gain set to 0 dB = -94 dBu measured with a 20 Hz/22 kHz bandpass filter
Noise at -10 dBV output with gain at 0 dB = -100 dBu measured with a 20 Hz/22 kHz bandpass filter
Signal to noise ratio relative to max headroom (27 dBu) = 121 dB
Signal to noise ratio relative to 0 dBfs (+22 dBu) = 116 dB
THD at unity gain (0 dB) = 0.0006% measured with 0 dBfs (+22 dBu) input signal and with a 20 Hz/22 kHz bandpass filter
Frequency response at unity gain (0 dB) = 0.1 dB down at 10 Hz and -3 dB down at 200 kHz
Instrument Input Response

Gain range (High Gain switch out) = 0 dB to 20dB continuously variable
Gain range (High Gain switch in) = 20 dB to 40dB continuously variable
Input Impedance = > 1 Meg Ohm
Noise at minimum gain (0 dB) = -90 dBu measured with a 20 Hz/22 kHz bandpass filter
Noise at maximum gain (40 dB) = -78 dBu measured with a 20 Hz/22 kHz bandpass filter
THD at minimum gain (0 dB) = 0.006% measured with -10 dBu input signal and with a 20 Hz/22 kHz bandpass filter
Frequency response at unity gain (0 dB) = 0.5 dB down at 10 Hz and -1 dB down at 200 kHz
Frequency response at maximum gain (40 dB) = 6 dB down at 10Hz and -1dB down at 200KHz
Input Meter

6 LED peak reading meter is calibrated relative to 0 dBfs where 0 dBfs = +22 dBu (the maximum level which can be correctly converted by the optional internal A/D converter before overload occurs). The meter calibration points are as follows:
Meter panel calibration value Equivalent dBu value
0dBfs +22dBu (the maximum level the ADC can convert before digital distortion occurs)
-6dBfs +16dBu
-12dBfs +10dBu
-18dBfs +4dBu (the normal signal level in an analogue system to allow headroom for additional processing such as EQ)
-24dBfs -2dBu
-42dBfs -20dBu

Channel Insert

Unbalanced input and output on balanced (TRS) socket as follows:
Tip = Send (Output)
Ring = Return (Input)
Signal level equivalent to -6dB below normal operating level.
High Pass Filter

Roll off = 12 dB per octave 2 pole filter
Cut off frequency:
-3 dB at 120 Hz
-6 dB at 85 Hz
-12 dB at 56 Hz
Optical Compressor

Threshold hold range = -12 dBfs (10 dBu) to -42 dBfs (-20 dBu).
Compressor ratio (Hard Ratio switch out) = 2.5:1
Compressor ratio (Hard Ratio switch in) = 6:1
Attack time (Slow Attack switch out) = 0.5 ms.
Attack time (Slow Attack switch in) = 5 ms.
Release time = 100 ms to 1 s and then auto release mode when the release knob is turned fully clockwise. Auto release creates a release time dependent upon the average level of the incoming signal.
Noise = -94 dBu measured with a 20 Hz/22 kHz bandpass filter.
Makeup gain = 0 to +21 dB.
Compressor Side-Chain Insert

Can be used to input an independent signal to trigger compression or to allow the side-chain audio to be sent in and out of the unit via an external processor, such as an EQ for frequency conscious compression and de-essing of vocals.
Connector is an unbalanced input and output on balanced (TRS) socket as follows:-
Tip = Send (Output)
Ring = Return (Input)
Signal level equivalent to -6 dB below normal operating level.
Mid Scoop EQ

EQ shape = Peak
Center frequency = Variable between 120 Hz and 2 kHz
Cut (Deep switch out) = -6 dB
Cut (Deep switch in) = -12 dB
Q (Deep switch out) = 1.5
Q (Deep switch in) = 3
FX Send

Unbalanced output, signal level equivalent to -6 dB below normal operating level.
Noise = -94 dBu measured with a 20 Hz/22 kHz bandpass filter.
Maximum output signal level = +20 dBu
FX Return

Balanced input
Operating level = +4 dBu
Headphones Mix

Unbalanced output, signal level equivalent to -6 dB below normal operating level.
Noise = -94 dBu measured with a 20 Hz/22 kHz bandpass filter.
Maximum output signal level = +20 dBu
Monitor Input

Balanced input
Operating level = +4 dBu
Monitor Output

Balanced output
Operating level = +4 dBu
Noise = -98 dBu measured with a 20 Hz/22 kHz bandpass filter and monitor level knob at maximum output level (fully clockwise).
Maximum output signal level = +26 dBu
DAC Performance

Playback sample frequency = 32 kHz to 192 kHz.
Maximum bit depth = 24-bit
Maximum analogue output level = +21 dBu.
Dynamic Range = 111 dB measured with A weighted filter.
Wordclock BNC connector outputs a regenerated wordclock at the sample frequency contained within the SPDIF signal connected to the RCA connector.
Output Meter

Calibrated for 0 dBfs = +22 dBu and indicates the level after the output fader being sent to both the internal AD converter and the TwinTrak Pro XLR output.
O/L LED is lit when any section of the unit (including the headphone output) reaches a level greater than 0 dBfs (O/L: LED triggered at +22.4 dBu).

Weight
5 kg

Dimensions
482 mm (W) x 88 mm (H) x 180 mm (D)

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