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Focusrite ISA One Single Channel Mic Pre/DI - Used  From Focusrite

Classic Mic Pre With Independent DI

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Focusrite

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Manufacturer's Description from Focusrite

Featuring a rugged, portable all-metal enclosure, ISA One combines the classic Focusrite microphone preamp with a flexible, independent DI channel and optional 192kHz precision A-D conversion. At the heart of the ISA range is the microphone preamplifier with its Lundahl input transformer – essentially the same circuit, based on the original ISA 110, that has been used for 30 years in successive Focusrite designs. The input transformer imparts a special character to the sound that can't be truly emulated in any other way, while the modern twist of variable input impedance allows for a new degree of flexibility.

Whether you're an artist, engineer or producer, you'll appreciate the versatility of the ISA One, with its front-panel DI input. The DI includes low/high impedance switching and an amplifier output, and its own feed to the optional A-D converter and separate rear-panel XLR output.

 

Features:

  • Classic ISA mic preamp design featuring Lundahl LL1538 input transformer
  • Flexible independent DI channel
  • Switchable input impedance including classic ISA 110 setting
  • Headphone output with volume control
  • Dedicated insert point
  • Optional stereo 192kHz A-D conversion card
  • Brainworx bx_console Focusrite – exclusive plug-in that faithfully captures the sound, feel and styling of the original Focusrite ISA 110 Equaliser and ISA 130 Dynamics Modules.
Focusrite

About Manufacturer

The Focusrite brand was established way back in 1985 and the founding principles of the company were to develop products that sounded more musical, in addition to just measuring well - today,we still carry these founding principles forward in our class-leading and award-winning designs. We measure our success by the success of you, our clients, and you will find Focusrite product prominent in professional and project studios throughout the world. Based just outside of London, we work with the best design talent throughout the world to bring you the tools to enhance the way you work. Our product is made with pride and principle in a highly automated ISO 9002 factory with significant level of test by engineers who themselves are musicians and understand the part our product plays in your process. Our commitment: We understand that how your project sounds to you is your most important concern. We are totally dedicated and focused on designing and manufacturing product that will enable you to achieve this goal. Our design goals are that product should be easy to use, logically designed, give class-leading performance and give years of predictable performance. We strive to continuously improve ourselves in these respects - our principal concern is meeting your expectations. Our focus on quality is all consuming - it rules our daily life.

Specifications

MIC INPUT RESPONSE


Gain Range (Mic)

0dB to 60dB in 10dB steps 20 dB of variable gain

EIN (Mic)

-126dB measured at 60dB of gain with 150 Ohm terminating impedance and 22Hz/22kHz band-pass filter

Noise (Mic)

Noise at output with unity gain (0 dB) and 22 Hz-22 kHz band pass filter-97 dBu

Signal-To-Noise Ratio (Mic)

106 dB relative to max headroom (9dBu)

Frequency Response (Mic)

At minimum gain (0 dB)-0.5dB down at 10Hz and -3dB down at 125kHz

CMRR (Mic)

98dB (Channel 1, 1kHz, maximum gain with 24 dBu input)

Crosstalk Channel To Channel (Mic)

With 10dB@1kHz input to chA, chB output =104dBrA. With 10dB@10kHz input to chA, chB output = 84dBrA

 

LINE INPUT RESPONSE


Gain Range (Line)

-20dB to 10dB in 10dB steps 20 dB of variable gain

Input Impedance (Line)

10 kO from 10 Hz to 200 kHz

Total Harmonic Distortion Noise (Line)

Measured with a 0 dBu input signal, and a 22 Hz-22 kHz band pass filter0.0001

Frequency Response (Line)

At unity gain (0 dB)-0.3dB down at 10Hz and -3dB down at 200kHz

 

INSTRUMENT INPUT RESPONSE


Gain Range (Instrument)

10dB to 40dB continuously variable

Input Impedance (Instrument)

High = greater than 1M Low =greater than 300k

THD (Instrument)

At minimum gain ( 10)

 

HIGH-PASS FILTER


Roll-Off

18 dB per octave (3 pole filter)

Frequency

Fixed 75Hz measured at the 3dB down point

 

WEIGHT AND DIMENSIONS


W X D X H

220mm (W) x 104mm (H) x 254 - 290mm

Weight

3.9 kg (8.6 lbs)

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