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Focusrite ISA One Single Channel Pre Amp
  • Focusrite ISA One Single Channel Pre Amp
  • Focusrite ISA One Single Channel Pre Amp
  • Focusrite ISA One Single Channel Pre Amp
  • Focusrite ISA One Single Channel Pre Amp
Focusrite

Focusrite ISA One Single Channel Pre Amp

Code: MOIFONEA-UK
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  • Single channel pre amp
  • ISA series transformer-based preamplifier - based on the original ISA110
  • Flexible independent front panel DI input
  • Low/ high impedance switching and an amplifier output
  • Backlit VU meter with variable calibration
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RRP: £529.00 (inc. VAT)
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Your Price: £479.00 (inc. VAT)
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ISA One features a rugged, portable all-metal enclosure, combining the classic Focusrite microphone preamp with a flexible, independent DI channel and optional 192kHz precision A/D conversion. The ISA One is based on the classic vintage microphone pre-amplifier topology from the original ISA110 module, including the Lundahl L1538 transformer and bespoke zobel network. (The original 110 pre amp circuitry has been used for 30 years in successive Focusrite designs).

The pre amp is complemented by a line input (XLR and TRS Jack) and an independent D.I. channel, complete with dedicated gain control, active or passive impedance switch, a TRS Jack output for routing to an amp and an independent XLR output on the rear. This flexible independent D.I. makes the ISA One ideal both for engineers wishing to blend a D.I.'d guitar signal with a mic'd guitar cabinet, and for demanding performers who require a single classic solution for both guitar and vocals.

ISA One also features an insert point, should the need arise to place extra processing between the pre amp or D.I. and the optional converter. Phantom power, phase reverse and a 75Hz, 18dB/octave high-pass filter are also available from the angled front fascia.

Independent input metering for both channels is provided in the form of a moving coil VU meter with variable calibration to suit analogue and digital recording media, alongside two six-LED peak meters; inputs can be metered either pre- or post-insert. The meter calibrations utilise all the same reference points as Digidesign's Pro Tools HD system, allowing effortless line-up.

ISA One's headphone output features a dedicated volume control, which delivers an external stereo cue mix, (a simple click track, or a stereo mix feed from an interface or a live console,) fed to the headphones via two TRS jack inputs on the rear of the unit.

ISA One Main Features

  • ISA series transformer-based preamplifier
  • Encased in a rugged and portable chassis
  • Flexible independent DI channel - featuring independent gain control, an output for routing to an amp, an independent XLR output on the rear and routing to the optional A-D converter
  • Switchable impedance - choose one of four carefully selected input impedances to suit any microphone
  • Headphone output with volume control
  • Dedicated insert point allows you to place extra processing between the preamplifier or DI and the optional converter, such as an EQ or compressor
  • Optional stereo 192kHz A-D converter
  • Lundahl LL1538 Input Transformer
  • Backlit VU meter with variable calibration

 

Specifications

 

Analogue Channel Inputs

 

  • XLR Mic input
  • One XLR and one TRS line input
  • XLR Instrument input TRS Jack
  • External ADC input TRS Jack
  • TRS jack return

 

Analogue Channel Outputs

 

  • TRS jack send
  • XLR balanced line output
  • XLR DI output
  • TS jack DI through

 

Analogue Channel Additional I/O

 

  • TRS Jack cue mix left input
  • TRS Jack cue mix right input
  • 1/4” TRS Jack headphones output

Mic Input Response

 

Gain range 0dB to 60dB in 10dB steps + 20 dB of variable gain
Input Impedance Switched Impedance setting Equivalent Input Impedance at 1kHz Low = 600 Ohms
ISA110 = 1400 Ohms
Med = 2400 Ohms
High = 6800 Ohms
EIN (Equivalent Input Noise) -126dB measured at 60dB of gain with 150 Ohm terminating impedance and 22Hz/22kHz band-pass filter
Noise Noise at output with unity gain (0 dB) and 22 Hz-22 kHz band pass filter -97 dBu
Signal-to-Noise Ratio 106 dB relative to max headroom (9dBu)
Total Harmonic Distortion + Noise Measured at medium gain (30dB) with a 1kHz -20dBu input signal and with a 22Hz/22kHz band-pass filter < 0.0009%
Frequency Response At minimum gain (0 dB) -0.5dB down at 10Hz and -3dB down at 125kHz
  At maximum gain (60dB) -3dB down at 16Hz and -3dB down 118kHz
CMRR (Common Mode Rejection Ratio) 98dB (Channel 1, 1kHz, maximum gain with +24 dBu input)
Crosstalk Channel to Channel With 10dB@1kHz input to chA, chB output =104dBrA. With 10dB@10kHz input to chA, chB output = 84dBrA

Line Input Response

Gain range -20dB to +10dB in 10dB steps + 20 dB of variable gain
Input Impedance 10 k? from 10 Hz to 200 kHz
Noise Noise at main output with gain at unity (0 dB) measured with 50 ? source impedance and a 22Hz - 22 kHz band pass filter -96 dBu
Signal-to-Noise Ratio Measured with a 22 Hz-22 kHz band pass filter 120 dB relative to max headroom (24 dBu)
118dB relative to 0dBFS (+22dBu)
Total Harmonic Distortion + Noise Measured with a 0 dBu input signal, and a 22 Hz-22 kHz band pass filter 0.0001%
Frequency Response At unity gain (0 dB) -0.3dB down at 10Hz and -3dB down at 200kHz

Instrument Input Response

Gain range 10dB to 40dB continuously variable
Input Impedance High = greater than 1M
Low =greater than 300k
Noise Measured with 22 Hz-22 kHz band pass filter Minimum gain (+10 dB): -92 dBu
Maximum gain (+40dB): -62dBu
THD At minimum gain (+10)
Frequency Response At minimum gain (+10 dB) -10dB input: 10Hz-100kHz +/- 0.6dB
  At maximum gain (+40 dB) -40dB input: -2.5dB down at 10Hz and 0dB at 100kHz

Meters

Moving Coil (MC) Meter factory calibrated to 0VU = +4dBu with 1kHz sinewave. With the VU Cal button pressed the meter can be adjusted on the rear panel to allow 0VU to equal +10dBu to +26dBu with the centre detent being equal to +22dBu.
Peak LED Meters Calibrated in the detent position for 0dBFS = +22dBu, calibration is adjustable on the rear panel to allow 0dBFS to equal +10dBu to +26dBu
Routing for MC and Peak1 meter is after the HPF, pre insert send or switched post insert return. Peak2 is always pre ADC channel 2, which can be fed by external input or Instrument input.
LED Levels As follows, when peak calibration is set to center detent on the rear panel. (This is when using the internal ADC). 0 = +22dBu
-2 = +20dBu
-6 = +16dBu
-12 = +10dBu
-18 = +4dBu
-42 = -20dBu
Frequency Response At minimum gain (+10 dB) -10dB input: 10Hz-100kHz +/- 0.6dB
  At maximum gain (+40 dB) -40dB input: -2.5dB down at 10Hz and 0dB at 100kHz

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 (D - top to bottom) 8.66" (W) x 4.1" (H) x 10" - 11.4" (D - top to bottom)
Weight 3.9 kg 8.6 lbs

 

Focusrite ISA One Single Channel Pre Amp

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Delivery Charges

All orders over £20.00 will be delivered free via our standard delivery 2-4 days (UK Mainland)

If you need your item faster we also offer a Priority Tracked service at £3.99 (1-2 days) or Next Day Tracked £5.99

(please ensure you add a mobile number to your order for tracking)

Saturday delivery is available when ordered before 2pm (Mon-Fri)

All orders below £20.00 will start as low as £2.49 depending upon weight and qty(s) (UK Mainland) 

All Delivery options will be available at the checkout


EU Delivery Times

Non UK Mainland Addresses please allow 1-3 Days
Delivery To Belgium / France / Germany please allow 3-4 Days
Music PC Systems - Please allow 5- 7 Working Days build time (UK) 7-14 (Rest of the World)

French - Pour la Livraison s'il vous plaît permet en France 2-4 Jours
German - Für Lieferung Nach Deutschland erlaubt bitte 2-4 Tage

Delivery Notes
On delivery you must inspect the goods carefully for damage as Inta Audio is unable to accept responsibility for damage in transit, shortage of delivery or loss of products unless the customer advises Inta Audio of such within three working days from the date of delivery.

 

Returns Policy

We ask that you follow these guidelines to help us process your return as quickly and efficiently as possible:

1. Please keep your order reference to hand. This confirms your original order and gives us the necessary details to authorise the product’s return.

2. Contact our Customer Services Team on 02476 369897 (or e-mail cs@inta-audio.com). We will then send you an RMA number and returns form which needs to be completed and sent back with the returned item(s).

3. (If the order has been unpacked) re-package it to ensure that it is being returned in its original condition. Please make sure all items relating to the product are returned, including manuals and cables.

4. When returning an item please obtain a ‘proof of postage’ receipt from the Courier.


Returned items must be mailed within 10 days of when the RMA Number has been issued. Items received with a post date 30 days after your requested return will NOT be eligible for refund.

Please note: Our returns policy is quite straightforward but there are a number of conditions that we ask our customers to comply with before applying:

1. It is your responsibility to request a return. If you don’t tell us you want to make a return, we don’t know. Once you do tell us, we will do everything we can to action it.

2. If you have not requested a return within 28 days of receiving an order, we will have assumed that you are intending to keep it and we will not authorise a return.

3. We always refund the payment according to how the original purchase was made and aim to do so within 72hrs of the return being received by us.

4. Returned goods are liable for a restocking fee of 15% towards handling and repackaging if the order is not returned in its original, unopened packaging. This charge will be subject to our inspection of the returned goods.

5. Delivery charges will not be refunded unless the delivered goods are faulty.

6. Replacement products are dispatched immediately after the returned goods have been received and accepted by Inta Audio.

7. Items that develop a fault within 30 days of delivery are eligible for a replacement or a refund. Delivery costs are also reimbursed for faulty items. Please contact our Customer Services Team on 02476 369898 if you believe your item has developed a fault.

Finally, please remember that notifying us of your intention to apply for a return, saving the delivery paperwork and keeping the order in its original packaging will help both you and Inta Audio to process the return quickly.

If you have any questions about our Returns policy please telephone us on 02476 369897 or email us at cs@inta-audio.com.