Focusrite ISA One - Muziekhuis Da Capo

Focusrite Launch Document
Product Name:
Focusrite ISA One
(Preliminary V0.9)
Short Description – 125 words
The ISA One microphone pre-amplifier delivers Focusrite’s prestigious ISA
transformer-based pre-amplifier in a rugged and portable chassis, at a
groundbreaking price.
ISA One shares the same pre-amplifier topology as Focusrite’s classic ISA110,
featuring the original Lundhal LL1538 transformer and bespoke zobel network.
This pre-amplifier topology formed the cornerstone of Focusrite’s legendary
Forte console and ISA Series pre-amplifiers has been used on countless hit
records over the last two decades.
This classic pre-amplifier design is augmented by a flexible and independent D.I.
channel, switchable impedance, a headphone output with cue-mix input, and an
optional class-leading 192kHz ADC. Finally, with its robust construction and
rugged custom carry case, the ISA One has made the classic Focusrite signature
sound more portable and more affordable than ever before.
Detailed Description – 800 words
The ‘ISA One’ microphone pre-amplifier delivers Focusrite's prestigious ISA
transformer-based pre-amp in a rugged and portable chassis, at a
groundbreaking price.
ISA One features 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 formed the cornerstone of each
channel of Focusrite's legendary Forte console.)
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.
A variable impedance circuit has been added, allowing the user to switch
between four carefully selected input impedance settings. In addition to the
original ISA110 impedance, three further impedance settings allow perfect
matching, or creative mismatching of the pre amp with any microphone. 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.
An optional state-of-the-art stereo A-D converter is also available, embodying
cutting-edge conversion technology seated within Focusrite’s custom analogue
circuitry. This optional card can be retrofitted at any time and provides two
channels of 24 bit/192kHz A-D conversion with a dynamic range of 119dB.
Key features:
ISA Series transformer-based pre amp
Encased in a rugged and portable chassis, offering the classic Focusrite
microphone pre-amplifier at its lowest cost to date.
Flexible independent D.I. channel
ISA One is ideal both for engineers and demanding performers alike, featuring
independent gain control, an output for routing to an amp and an independent
XLR output on the rear.
Switchable Impedance
Choose one of four carefully selected input impedances, including the original
ISA 110 setting, to suit any microphone.
Optional Stereo 192kHz ADC
This optional card embodies cutting-edge conversion technology, incorporating
Focusrite analogue circuitry to deliver the best A/D performance in its class
(Dynamic range of 119dB.)
Secondary features
Rugged Custom Flight Case
Built to protect your ISA One from the rigors of the road. The case is made of a
rugged plywood construction with a solid polypropylene exterior and reinforced
corners. It includes extra space for cables and the like.
Headphone output with volume control
ISA One can deliver an external stereo cue mix, (such as a stereo mix feed from
an interface,) fed to the headphones via two TRS jack inputs on the rear of the
unit.
Dedicated Insert point
Allowing you to place extra processing between the pre amp or D.I. and the
optional converter, such as an EQ or compressor.
Phantom power, Phase reverse and High-pass filter
All available from the angled front fascia. The high-pass filter operates at 75Hz,
18 dB/octave.
Flexible independent input metering
Both a moving coil VU meter with variable calibration, alongside two six-LED
peak meters; inputs can be metered either pre- or post-insert and utilise all the
same reference points as Digidesign's Pro Tools HD system.
Optional Accessories
An optional stereo 192kHz ADC is available for the ISA One. It’s the same optional
card used in the ISA430 Mk II. This card is purchased separately and can be
retrofitted at any time. This card deliver
Competitor Comparison
Not yet available – see v.1.0, available from the VIP site before 1st March 2008
Key Competitors
Not yet available – see v.1.0, available from the VIP site before 1st March 2008
Performance Specification
Mic Input Response
• Gain range = 0dB to 60dB in 10dB steps + 20 dB of variable gain
• Input Impedance, variable as follows: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 at main output with gain at unity (0dB) = -97dBu measured with a
22Hz/22kHz band-pass filter
• Signal to noise ratio relative to max headroom (9dBu) = 106dB
• THD at medium gain (30dB) = 0.0009% measured with a 1kHz -20dBu input
signal and with a 22Hz/22kHz band-pass filter
• Frequency response at minimum gain (0dB) = -0.5dB down at 10Hz and -3dB
down at 125kHz
• Frequency response at maximum gain (60dB) = -3dB down at 16Hz and -3dB
down 118kHz
• CMRR=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 = 10kΩ from 10Hz to 200kHz
• Noise at main output with gain at unity (0dB) = -96dBu measured with a
22Hz/22kHz band-pass filter
• Signal to noise ratio relative to max headroom (24dBu)=120dB
• Signal to noise ratio relative to 0dBFS (+22dBu) = 118dB\
• THD at unity gain (0dB) = 0.001% measured with a 0dBu input signal and with a
22Hz/22kHz band-pass filter
• Frequency Response at unity gain (0dB) = -0.3dB down at 10Hz and -3dB down
at 200kHz
Instrument Input Response
• Gain range = 10dB to 40dB continuously variable
• Input Impedance:
High >1MΩ
Low > 300kΩ
• Noise at minimum gain (+10dB) = -92dBu measured with a 22Hz/22kHz bandpass filter
• Noise at maximum gain (+40dB) = -62dBu measured with a 22Hz/22kHz bandpass filter
• THD at minimum gain (+10dB) = 0.001% measured with a 10dBu input signal
and with a 22Hz/22kHz band-pass filter
• Frequency Response at 10dB gain with -10dB input = 10Hz-100kHz +/- 0.6dB
• Frequency Response at 40dB gain with -40dB input = -2.5dB down at 10Hz and
0dB at 100kHz
High Pass Filter
• Roll off = 18dB per octave 3 pole filter
• Fixed Frequency 75Hz measured at the 3dB down point
Meters
• Moving coil (MC) meter is 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 are as follows when peak calibration is set to center detent on the
rear panel. (This is when using the internal ADC).
0
-2
-6
= +22dBu
= +20dBu
= +16dBu
-12 = +10dBu
-18 = +4dBu
-42 = -20dBu
Front and Rear Connectivity
Analogue Channel Inputs:
Mic input:
Line input:
Instrument input TRS Jack:
External ADC input:
Return:
XLR x 1
XLR x 1 and TRS x1
XLR x 1
TRS Jack x 1
TRS Jack x 1
Analogue Channel Outputs:
Send:
Balanced line output:
DI output:
DI through:
TRS Jack x 1
XLR x 1
XLR x 1
TS Jack x 1
Analogue Channel Additional I/O:
Cue mix left input:
Cue mix right input:
Headphones output:
TRS Jack x 1
TRS Jack x 1
¼” TRS Jack x 1