June 2003 sees the launch of the Platinum TwinTrak Pro, the latest innovative member of the award-winning Focusrite Platinum range. Designed principally as an affordable, high-specification dual mono/stereo tracking device, TT Pro (as it's affectionately known) also boasts comprehensive latency-free monitoring, unmatched digital connectivity, and all within a sturdy 2U 19" rack-mount chassis.
Each channel features Focusrite's award-winning Platinum pre amp, 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. In pride of place is TT Pro's powerful dual mono/stereo optical compressor. This 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 are complemented by a comprehensive set of focussed controls. TT Pro is the first Platinum to feature a D/A converter as standard, alongside its optional analogue to digital converter. The D/A converter enables the user to feed mono or stereo digital signals into TT Pro. These signals can be fed either into the stereo latency-free monitoring section, or via line inputs (post- the pre amp 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 TT Pro the perfect analogue interface for any digital audio workstation, and equally the world's first 'hardware plug-in'.

Features include:
2 award-winning Class A discrete transistor-based pre amps
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 wordclock (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 fascia for both instruments (Jack) and microphones (XLR)
Post pre amp inserts and compressor side-chain inserts, for enhanced processing flexibility
2 ocean blue peak-reading meters, innately beautiful and 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 sidechain 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
Centre 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)