Focusrite
ISA828 Channel Strip
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Eight classic microphone pre-amplifiers & class leading A-D conversion
The ISA828 8-channel microphone pre-amplifier provides eight original ISA transformer-based pre amps in a single robust 2U chassis, offering the Focusrite signature sound at its lowest cost per channel to date.
The Focusrite ISA mic preamp is based on the original design created by Rupert Neve in 1985 for Sir George Martins AIR Studios. Virtually unchanged over the years, the ISA mic preamp delivers the warm, full sound that could be just what youre looking for - and if you use a significant number of microphones at once, the ISA828 is for you.
Significant alterations to the design include the addition of three additional input impedances to the original vintage ISA110 setting. Ranging from low to high impedance, the four settings enable you to get the very best sound from a vintage mic - it's after all what the ISA was originally designed for - but also get a clean, transparent sound from the microphones of today. Or you can enhance a particular feature of your favourite microphones. Indeed, ISA makes the perfect match for any mic. There's also a vintage design 75Hz / 18dB per octave high pass filter on each channel for detailed control of the bass end.
Four front-panel direct instrument inputs are also provided, with high and low impedance settings for extra versatility, and the input side is rounded out by eight TRS rear-panel line inputs. With convenient 25-pin D-type output connectors, ISA 828 is easy to interface with Pro Tools HD and other popular recording systems and consoles. There's also an optional 8-channel A/D converter available with 122dB dynamic range and sampling up to 192kHz. An insert is available on each channel between the preamp and the A/D. 6-LED meters let you know exactly what is going on, and use the same reference points as Avid Pro Tools HD.
KEY FEATURES
• Eight ISA series transformer-based preamps
• Optional eight-channel 192kHz A-D converter embodies cutting edge conversion technology, incorporating Focusrite analogue circuitry to deliver the best A-D performance on the market
• Interface easily with Pro Tools and other systems. With convenient 25-pin D-type connectors, ISA 828 integrates quickly and seamlessly with Pro Tools | HD, as well as other popular hard disk recorders and mixing systems.
• Direct instrument inputs featuring high and low impedance options to provide a comprehensive and accessible DI solution.
• Inserts available on every channel. Allows external devices to be inserted between the preamp and the A-D converter, using a 25-pin D-type cable.
• Switchable impedance selectable per channel. Choose one of four carefully selected input impedances, including the original ISA110 setting, to suit any microphone.
• High pass filter, polarity reverse and phantom power. Each has a dedicated switch, independent on each channel.
• Six LED input meter complete with precise meter trim - designed to utilise the same reference points as Pro Tools | HD.
• Eight Lundahl LL1538 mic input transformers - the original mic transformer used in the original Red modules helps to provide the unique sound and performance of this ground-breaking design.
SPECIFICATIONS
Mic Input Response
• Gain range: 0dB to 60dB in 10dB steps
• Input Impedance, variable: 600, 1k4, 2k4, 6k8
• EIN (equivalent input noise): -126dB measured at 60dB of gain with 150 Ohm terminating impedance and 22Hz/22kHz bandpass filter
• Noise at main output with gain at unity (0dB): -97dBu measured with a 22Hz/22kHz bandpass filter
• Signal to noise ratio relative to max headroom (9dBu): 106dB
• THD at medium gain (30dB): 0.0008% measured with a 1kHz -20dBu input signal and with a 22Hz/22kHz bandpass filter
• Frequency response at minimum gain (0dB): -0.5dB down at 10Hz and 3dB down at 110kHz
• Frequency response at maximum gain (60dB): 3dB down at 16Hz and 3dB down 85kHz
• CMRR: 91.8dB (Channel 1, 1kHz, maxiumum gain)
• Crosstalk Channel to Channel: with 10dB@1kHz input to chA, chB output =102dBrA. With 10dB@10kHz input to chA, chB output = 84dBrA
Line Input Response
• Gain range: -20dB to +10dB in 10dB steps
• Input Impedance: 10k from 10Hz to 200kHz
• Noise at main output with gain at unity (0dB): -96dBu measured with a 22Hz/22kHz bandpass 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 bandpass filter
• Frequency Response at unity gain (0dB): 0.3dB down at 10Hz and 3dB down at 122kHz
Instrument Input Response
• Gain range: 10dB to 40dB continuously variable
• Input Impedance: 1M or 300k
• Noise at minimum gain (+10dB): -90dBu 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): 0.002% measured with a 10dBu input signal and with a 22Hz/22kHz bandpass filter
• Frequency Response at 10dB gain with -10dB input: 10Hz-200kHz +/- 0.6dB
• Frequency Response at 40dB gain with -40dB input: -2.5dB down at 10Hz and 0dB at 200kHz
High Pass Filter
• Roll off: 18dB per octave 3 pole filter
• Fixed Frequency 75Hz measured at the 3dB down point
Dimensions (W x H x D): 484mm x 85mm x 305mm (350mm depth with heat sink) / 19" x 3.5" x 12" (13.8" depth with heat sink)
Weight: 8.84kg / 19.5lbs
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A warranty can be a very important factor when making a buying decision. Because repairs can be very expensive in terms of parts and labour costs, manufacturers usually only provide one year limited warranties that generally only cover items that malfunction due to a manufacturer’s defect. With an important purchase such as a musical
instrument or piece of studio gear, however, many people want to have the peace of mind in knowing that their investment will be protected should the product no longer be performing at 100%.
Because of this, Long & McQuade provides our customers with a FREE one-year Performance Warranty on most of our products. The Long & McQuade Performance Warranty supplements the manufacturer’s warranty to ensure that our customers receive complete “no hassle” warranty coverage within their first year.
How does the Long & McQuade Performance Warranty differ from most manufacturers' warranties?
- Performance Guarantee: Normal wear and tear is covered, so your product will be performing as well as the day you purchased it for the entire duration of the coverage. Band and Orchestral Performance Warranty does not include replacing pads or cleaning for woodwind instruments, unless deemed necessary by our repair staff. Ultrasonic cleaning for brass instruments will be provided if deemed necessary by our repair staff, but is not routinely offered under the Performance Warranty.
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Purchasing additional years of coverage
Some manufacturers provide warranties for longer than 1 year; however, these are usually limited warranties that do not provide the same coverage as the Long & McQuade Performance Warranty. Customers interested in more complete and convenient (but not necessarily longer) coverage are still able to purchase additional years of the Performance Warranty.
If you are interested in receiving this coverage for longer than one year, you have the option of purchasing additional years of the Performance Warranty. The pricing is as follows:
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| Product | SKU | Qty |
|---|---|---|
| ISA828 Channel Strip | 274337 |
