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Focusrite Octopre MKII AD converter and microphone preamplifier

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Focusrite Octopre MKII AD converter and microphone preamplifier
Product no: TS-OCTOPRELE Bax Music Warranty: This product comes with a 3-year warranty.

General

The OctoPre MKII is a 19-inch 8-channel preamplifier and AD converter in one. It's well suited for line inputs, microphones and instruments, and thanks to the high-quality preamps that Focusrite is known for, you can count on uncompromising audio amplification. Convenient extras include the switchable 48V phantom power per group and a switchable pad per input, which help to ensure excellent ease of use. You can also use the OctoPre MKII as an ADAT converter. Typically, it has a resolution of up to 48 kHz, though it can be supported by the Focusrite OctoPre MK II SMUX; with two ADAT signals together, the resolution can be increased up to 96 kHz.

Inputs and outputs of the OctoPre MKII

You can directly connect two signal sources (microphones, instruments or line signals) to the front of the OctoPre MKII, and you'll find six inputs for a line or mic signal on the back. Each input is equipped with a combo XLR/jack connector for optimal connection freedom. The OctoPre MKII also has plenty of outputs, thanks to the eight 6.35mm stereo jacks.

Monitoring and optimal attunement

Tuning the incoming signal is a piece of cake, since the OctoPre MKII has a detailed gain on each channel. Each input is also equipped with a switchable pad. You can monitor all of the incoming signals individually via a matrix of LED VU meters, which gives a detailed account of all your levels. Finally, to offer optimal synchronisation, the OctoPre MKII has internal clocking, though connecting an external wordclock device is also possible should you so choose.

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Specifications

Product features

19-inch rack size	1U
Number of channels	8
Digital output	yes
Energy source	AC
Phantom power	yes
Phase reverse	no
Headphone output	no
Built-in compressor	no
Built-in equaliser	no
Built-in limiter	no
Equipped with tube	no

Weight and dimensions including packaging

Weight (incl. packaging)	5,0 kg
Dimensions (incl. packaging)	61,0 x 35,0 x 13,0 cm

Product specifications

8-channel microphone and instrument preamplifier
AD converter (ADAT)
maximum of 2 instruments can be connected simultaneously
maximum of 8 microphones or line signals can be connected simultaneously
channel 1 and 2 on the front, for mic/instr/line, via combo XLR/jack connector
channels 5 - 8 on the back, for mic/line, via combo XLR/jack connector
8 line outputs via balanced TRS output
+48V phantom power switchable for channels 1-4 and 5-8
2x optical output (8 channels via SMUX adjustable up to 96 kHz)
adjustable sample rate: 96, 88.2, 48 and 44.1 kHz
adjustable clock source: intern or wordclock
wordclock input, for optimal audio synchronisation
switchable pad per channel
LED VU meter monitoring per channel
fits 19-inch rack, 1 U
dimensions: 484 x 44 x 265 mm (W x H x D)
weight: 4.2 kg

Microphone input:

connection via XLR or 6.35mm jack
maximum of 8 microphones or line signals can be connected at a time
gain: +13 dB to +60 dB
input impedance: 2.5k / 150 at Lo-Z (Ch 1 & 2)
EIN: 124 dB at 60 dB gain with 150-ohm termination and 22Hz/22kHz filter
THD+N at Min Gain (+13 dB) = 0.0006% with a 0dBu input and 22Hz/22kHz filter
THD+N at Max Gain (+60 dB) = 0.003% with a -36dBu input and 22Hz/22kHz filter
THD+N at maximum input (+9 dBu) = 0.0008% with a 22Hz/22kHz filter
frequency response:
minimum gain (+13 dB) with a -13dBu input = -0.4dB at 10 Hz & -3 dB at 122 kHz
maximum gain (+60 dB) with a -60dBu input = -2.3 dB at 10 Hz & -3 dB at 67 kHz
CMRR at Max Gain (+60 dB) = 80 dB
line input
gain = -10 dB to +36 dB
input impedance: 24 k
noise at Unity Gain (0 dB) = -88 dBu with a 22Hz/22kHz filter
S/N ratio relative headroom (+36 dBu) = 124 dB
S/N ratio relative to 0 dBfs (+22 dBu) = 110 dB
THD+N at Unity Gain (0 dB) = 0.001% with 0 dBFS (+22 dBu) input and 22Hz/22kHz filter
frequency response at Unity Gain (0 dB) = -0.5 dB at 10 Hz & -3 dB at 110 kHz

Instrument input:

connection via XLR or 6.35mm stereo jack
connect up to two instruments simultaneously
gain: +13 dB to +60 dB
input impedance: 1 M
noise at min. gain (+13 dB): -87 dBu with 22Hz/22kHz filter
noise at min. gain (+13 dB): -87 dBu with 22Hz/22kHz filter
THD+N at min. gain (+13 dB) = 0.001% with 0dBu input and 22Hz/22kHz filter
frequency response @ min. gain (+13 dB) with -13dBu input = -0.4dB @ 10 Hz & -3 dB @ 122 kHz

Input meter:

peak level inductor meter: -24 dBfs to +2 dBfs (-2 dBu to +24 dBu), +22 dBu = 0 dBfs
overload LEDs activated at 0 dBfs (+22 dBu)
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

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