Eight award-winning Class A discrete transistor-based Focusrite pre-amps
This pre-amp demonstrates the same wide bandwidth philosophy featured in the original vintage Focusrite units, ensuring low noise and distortion.

Eight independent Focusrite Compressors/Limiters
Revolutionary circuit design allows dynamics to be handled via a single control.

Up to 16 digital outputs (24bit, 96kHz)
Two high quality 8-Channel A/D converters are available. Both converters are 24 bit and 128 x over-sampled, handling sample rates of up to 96kHz, but can dither down to 20 or 16 bit.

Two ‘Super Channels’
No separate D.I. is required, with TRS Jack inputs and phase reverse on the front fascia.

OctoPre features eight independent compressor/limiters, whose revolutionary circuit design allows dynamics to be handled via a single control. Starting with a brick-walllimiter (to avoid critical overs), the rotary control then allows you to add increasing amounts of compression.

Two independent side-chain control circuits are used for each channel of dynamics, one for limiting and one for compression. The limiter and compressor side-chains each generate two separate control signals, one fast and one slow, that are then fed to the gain change elements in the audio path. The gain control elements consist of a pair of custom Optos, which follow a crossover network that splits the audio into two bands, “high” and “low”. The fast side-chain drives the high frequency opto, whilst the slow side-chain drives the low frequency opto. This process ensures less distortion when the limiter is reacting to very fast transients. By splitting the response, only the high frequency section of the waveform is drastically affected, reducing inter-modulation distortion, and therefore non-related harmonics, providing a far more musical effect.

In addition, both the side-chains operate as feedback systems. Thus, the amount of compression and limiting is calculated using the level after the split opto stage. The advantage of this feedback system is that the limiter senses the level after compression has been applied and therefore the limiter only works when it absolutely has to.

The dynamics control also introduces an additional make-up gain, balancing the level change caused by compression. This auto make-up gain ensures the output level to the A/D remains constant whilst further compression is applied. Consequently, any input levels already set will not require any further adjustment during dynamics set-up.

Only one dial, but all the control, providing the quickest route to a warm, controlled, yet entirely musical signal. All the excitement and all the control without compromise.

Inputs
• Electronically balanced 20kW
• Nominal level +4dBu / -10dBV

Input Connectors
• 1/4" jack (channels one and two only)
• 25 pin D-type 8 channel line level analogue connector
• 8 XLR inputs for Mic

Front Panel Controls
• Phantom Power: On/Off: +48V
• Gain (mic): 0dB to 60dB
• Gain (line): -10dB to +10 dB
• Gain (instrument): 0dB to 60dB (Impedance > 1MOhm)
• Phase Reverse: On/Off (Channel 1 & 2 only)
• High Pass filter: On/Off: -12dB / octave. ?6dB at 75Hz
• Dynamics: Limiter threshold is fixed at 20dBu. Compressor threshold and ratio is variable
• Frequency select: Switchable (44.1, 48, 88.2, 96kHz)
• Dither: 24-, 20- or 16-bit

Metering
• Signal Present: -20dBFS (green LED)
• Overload: +22dBu (red LED)
• Compressor mode: Yellow LED intensity increases with compression
• Hard Limit mode: Red LED on when limiting (threshold = +20dBu)

Analogue Output
• 25-pin D-type 8 channel analogue connector

Performance specifications
• THD: 0.001% @ 20dBu input, mic and line at 0dB gain
• Noise: -96dB at unity gain through the unit
• Mic EIN: -128 dBu @ 6dB of gain with 150Ohm termination impedance
• Frequency response: -1dB at 10Hz to 200kHz

Weight
• 4.2kg
• 9.3Ibs

Dimensions
• 484mm (W) x 44mm (H) x 330mm (D)
• 19" (W) x 1.7" (H) x 13" (D)

With eight pristine class A Focusrite mic pre’s, eight compressor/limiters, and almost all the interface options known to man, OctoPre is the perfect partner for any Digital audio workstation, making high quality, multi-channel recording (eg. Drums and synths) easy.

Equally, it can be utilised as an instant location recording solution, (as part of an ultra-compact 8-channel system with a laptop,) or as an additional set of pre-amps for any analogue or digital console or hard disk recorder.

Each channel boasts the award-winning pre-amp featured in VoiceMaster PRO, alongside a revolutionary dynamics circuit, ensuring transparency and warmth with total control. The first two ‘Super channels’ also feature phase reverse, as well as TRS Jack inputs on the front fascia for quick and easy, DI-free plug-in.

Finally, the high quality digital converter options cover almost every interfacing eventuality. Up to sixteen digital outputs can run simultaneously with any mix of analogue outputs, and all the settings are adjustable, directly from the front fascia. With this entire package fitting into a single 1U chassis, OctoPre sets the standard for multi-channel recording solutions.

Two high quality A/D converters are available for OctoPre. The converters are 24-bit and 128x over-sampled, handling sample rates of up to 96 kHz, but can dither down to 20 or 16 bit. All frequency settings and bit rates can be altered from the front fascia, with an ADC lock LED to show when word clock is synchronised.

Option 1: ADAT outputs only
8 channels of ADAT lightpipe (up to 96 kHz).

Option 2: 8 AES/EBU or S/PDIF outputs + 8 channels of ADAT lightpipe
All on one board, up to 96 kHz - 16 channels at 48kHz (mirrored across the formats.

An external Wordclock input is also provided (BNC connector). The AES/EBU or S/PDIF format outputs can run simultaneously with the lightpipe outputs, giving up to 16 channels of digital output for all sample rates