Focusrite ISA828 8-channel Mic & Line Preamp - Preowned

Focusrite ISA828 8-channel Mic & Line Preamp - Preowned

Certified Preowned. Amazing work horse Eight Channel Mic Pre with Optional A-D.  Mint condition. This Preowned ISA 828 is a wonderfully built beast with eight Lundahl mic transformers...

Vendor :Focusrite

Type :Microphone Preamps

R28,000.00

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Certified Preowned. Amazing work horse Eight Channel Mic Pre with Optional A-D. 

Mint condition. This Preowned ISA 828 is a wonderfully built beast with eight Lundahl mic transformers and the bonus AD Card gives you 8 channels up to 96 kHz, and steps down to four channels (over two ADAT cables) at 176.4 or 192 kHz sample rates. AES/EBU and S/PDIF outputs are also available via a single DB25.

ISA 828 incorporates eight of Focusrite's renowned mic pres in a simple-to-operate 2U enclosure, placing eight mic preamps, instrument inputs and line ins at your fingertips. The original Focusrite mic pre was designed to suit the microphones of the time; today's model makes one small change, adding three additional input impedances to the classic ISA 110 setting, allowing you to match any microphone, old or new, and access a wide range of sounds, from the character and warmth of a vintage mic to the clear transparency of a modern design.

Each mic pre has the option of mic, line or the front-panel instrument input, with variable input impedance to ensure you are getting the best performance from the source. Up to 60dB of gain is available on the four-position rotary and gain range switches, with a further +20dB of continuously variable trim, meaning a huge 80dB of gain is available should it be required. The high-pass filter has a fixed 75Hz frequency and 18dB/octave roll-off for minimising rumble, stand-borne noise and other low-frequency sounds. An array of 6-segment LED meters show peak signal level for the four mic pres, in addition to the four direct inputs to the optional A-D card. Switchable rear-panel insert points allow the use of inline processors such as compression.

Tech Specs:

MIC INPUTS



Gain Range (Mic)

0 dB to 60 dB in 10 dB steps

Input Impedance (Mic)

Variable, 600O, 1k4O, 2k4O, 6k8O

Noise At Main Output With Gain At Unity (0 DB) (Mic)

-97 dBu measured with a 22 Hz / 22 kHz bandpass filter

Signal To Noise Ratio Relative To Max Headroom (9dBu) (Mic)

106 dB

THD At Medium Gain (30dB) (Mic)

0.0008 measured with a 1 kHz -20 dBu input signal and with a 22 Hz / 22 kHz bandpass filter

Frequency Response At Minimum Gain (0 DB) (Mic)

-0.5 dB down at 10 Hz and –3 dB down at 110kHz

Frequency Response At Maximum Gain (60 DB) (Mic)

–3 dB down at 16 Hz and –3 dB down 85 kHz

CMRR (Mic)

91.8 dB (Channel 1, 1 kHz, maxiumum gain)

LINE INPUTS



Input Impedance (Line)

10 kO from 10 Hz to 200 kHz

Gain Range (Line)

-20 dB to 10 dB in 10 dB steps

Noise At Main Output With Gain At Unity (0 DB) (Line)

-96 dBu measured with a 22 Hz / 22 kHz bandpass filter

Signal To Noise Ratio Relative To Max (Line)

120 dB

Signal To Noise Ratio Relative To 0dBFS( 22dBu) (Line)

118dB

THD At Unity Gain (0dB) (Line)

0.001 measured with a 0 dBu input signal and with a 22 Hz / 22 kHz bandpass filter

Frequency Response At Unity Gain (0dB) (Line)

0.3 dB down at 10 Hz and –3 dB down at 122 kHz

INSTRUMENT INPUTS



Gain Range (Instrument)

10 dB to 40 dB continuously variable

Input Impedance (Instrument)

1 MO or 300 kO

Noise At Minimum Gain ( 10 DB) (Instrument)

-90 dBu measured with a 22 Hz / 22 kHz bandpass filter

Noise At Maximum Gain ( 40 DB) (Instrument)

-62 dBu measured with a 22 Hz / 22 kHz bandpass filter

THD At Minimum Gain ( 10 DB) (Instrument)

0.002 measured with a 10 dBu input signal and with a 22 Hz / 22 kHz bandpass filter

Frequency Response At 10 DB Gain With -10 DB Input (Instrument)

10 Hz - 200 kHz /- 0.6 dB

Frequency Response At 40 DB Gain With -40 DB Input (Instrument)

-2.5 dB down at 10 Hz and 0 dB at 200 kHz

Roll Off

18 dB per octave 3 pole filter

Frequency (Instrument)

Fixed 75Hz measured at the 3dB down point

WEIGHT AND DIMENSIONS



Weight

8.84 kg (19.5 lbs)

Dimensions (W X H X D)

484mm (W) x 85mm (H) x 305mm (D) (350mm depth with heat sink)

 

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