You may only need a couple of mic preamps, but you need the best. The ISA Two is a dual mono mic preamp and is the ideal solution for those who want to make uncompromised stereo sockets: two high-quality independent channels of the purest classic Focusrite juice, with line and instrument inputs on the front - no DI box needed.
Like all ISA series preamps, the ISA Two employs a pair of Lundahl LL1538 input transformers that provide a wide bandwidth and silky sound. A variable impedance circuit has been added, allowing the user to switch between four carefully selected input impedance settings. In addition to the impedance of ISA110, there are three other parameters that allow you to adapt or not the input sensitivity of the preamp with any microphone on each of the two ISA Two inputs. In addition, both sides also have an insertion point that allows additional processing between the preamp or DI and the output. A significant increase in flexibility that allows the connection of EQ, compressors / gates or limiters to take.
Based on the legendary designs found in the Focusrite Focus console and studio consoles of the time, ISA Two is the perfect duo for your rack.
Front Panel: Each channel of ISA Two has:
- Gain Potentiometer and Gain Range Selector
- Impedance selector
Input selector
Filter Potentiometer (sliding from 16 Hz to 420 Hz)
- Phase switch, insert, 48V, HPF (18dB / octave at 75Hz), Gain 30-60
- 2 high impedance inputs for instrument
A double LED meter
Rear panel: - 2 MIC inputs
- 2 line inputs in TRS jack
- 2 x XLR outputs
- 2 Send / Return in TRS jack format,
Mic Input: - Gain Range: 0dB to 60dB in 10dB steps
- Impedance selection: 600 O, 1k4 kO, 2k4 kO, 6k8 kO
- EIN: -126dB measured at 60dB of gain with a termination at 150 Ohm on a filtered band of 20Hz / 22kHz
- Output noise at (0dB): -97dBu measured on a filtered band of 20Hz / 22kHz
- Signal to noise ratio for the maximum headroom (9dBu): 106dB
- THD with medium gain (30dB): 0.0008% measured at 1kHz -20dBu of input signal on a filtered band of 20Hz / 22kHz
- Frequency response at (0dB): -0.5dB up to 10Hz and 3dB up to 110kHz
- Maximum gain frequency response (60dB): 3dB up to 16Hz and 3dB up to 85kHz,
Line input: - Gain range: -20dB to + 10dB in steps of 10dB
- Input impedance: 10k from 10Hz to 200kHz,
Instrument input: - Gain range: 10dB to 40dB
- Input impedance: 1M or 300k,
Vu-meter: 8-segment LED to control the output level of the preamps,
Weight: 3.7 kg,
Dimmensions: 480mm x 280mm x 44mm
Category: microphone preamp
Number of channels: 2
Number of microphone inputs: 2
Number of instruments: 2
Lamps: no
Compressor: no
EQ: high pass filter
Gain: 80
Phantom power: yes
Phase opposition: yes
Impedance selector: yes
Insert: yes
Remote: no
Audio Outputs: XLR
Vumeter: LED level indicator
Rack unit: 1
Dimensions (mm): 480 x 280 x 44
Weight (kg): 3.70
Brand reference number:
RFR ISA-TWO
