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Table of contents for the manual
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Page 1
ISA 828 User Guide Mode d’empl oi F A0145-04[...]
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Page 2
W ARNINGS & C AUTIONS THE APP ARA TUS SHALL NOT BE EXPOSED T O DRIPPING OR SPLASHING, AND NO OB JECTS FILLED WITH LIQUIDS, SUCH AS V ASES, SHALL BE PLACED ON THE APP ARA TUS VENTILA TION SHALL NOT BE IMPEDED BY COVERING THE VENTILA TION OPENINGS WITH ITEMS, SUCH AS NEWSP APERS, CLOTHS, CURT AINS ET C. NO NAKED FLAME SOURCES, SUCH AS LIGHTED CAN[...]
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Page 3
Contents Getting Started and Po w ering Up . . . . . . 4 F r ont P anel . . . . . . . . . . . . . . . . . . . . . . . . 5 Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . 8 Digital Options . . . . . . . . . . . . . . . . . . . . . 10 Applications . . . . . . . . . . . . . . . . . . . . . . . 12 F AQs . . . . . . . . . . . . . . . . . . [...]
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Page 4
Getting Started and Pow ering Up The ISA 828 is a high quality eight-channel micr ophone pr eamplifier, which can be used to r ecor d microphone, line-l evel or instrument sour ces. Micr ophones and line-lev el sour ces f or all eight inputs are c onnected on the r ear panel, whilst instruments ar e plugged dir ectl y into the fr ont panel (inputs [...]
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Page 5
F r ont Panel Input Stage Eight number ed sections ar e included on the fr ont panel for setting up each of the eight anal ogue inputs. Input Pr essing Input steps thr ough each of the thr ee inputs, as indicated by the c orr esponding LEDs. When the Mic LED is lit, the micr ophone input is active etc. Henc e a mixtur e of micr ophone, line and ins[...]
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Page 6
Mode 1 Mic Gain Range 0-30 With the 30-60 switch off, the st epped gain dial operates ov er a gain range of 0dB to +30dB, the l evel of gain chosen being indicated on the fr ont panel by the outer arc of y ellow number s around the gain knob. Mode 2 Mic Gain Range 30-60 With the 30-60 switch on (illuminated), the s tepped gain dial operates o ver a[...]
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Page 7
Insert In Activating the INSERT switch (illuminat ed when active) br eaks the signal path of the channel, so that the signal connected t o the ADC Input 25-pin connector on the r ear panel routes t o the digital output car d (if connected) rather than the dir ect mic, line or instrument signal. Note that the mic, line or ins trument signal will sti[...]
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Page 8
Mode 2. Meters Pr e ADC switch engaged This is the mode to use when the anal ogue input signals ar e being rout ed to other har dwar e devices (such as dynamics pr oces sors) using the analogue outputs/ADC Input on the r ear panel (acting as sends/returns) bef or e converting t o digital. Obviousl y, the optional digital output car d should be inst[...]
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Analogue Inputs On the r ear panel, ther e ar e 8 XLR inputs for c onnecting micr ophones and 8 1/4” TRS inputs for line-l evel sour ces. Each one is number ed acc or dingly and c orr esponds to the r ele vant section on the fr ont panel. All 3-pin XLR balanced audio connector s ar e wir ed as foll ows: Pin 1: Scr een/Chassis Pin 2: Audio 0° Pin[...]
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Page 10
IEC mains inlet This socket all ows the supplied IEC cabl e to be c onnected to enabl e the 828 to be power ed. A fused voltage sel ector is also pr esent, with a diagram al ongside to indicate the positions that r elate to each voltage. Optional digital car d connections The r emaining connections (if pr esent) ar e those on the optional digital c[...]
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Page 11
In single-wir e mode, switch out, the AES channels 1-8 can be transmitted at sampl e rates up to 192kHz using onl y 8 AES connections. Ther efor e, channels 1-8 ar e always availabl e in AES f ormat, r egar dles s of the S/PDIF switch setting. 24-bit/192kHz ADA T™ interfac e operation The car d pr ovides digit al outputs for all eight ISA 828 cha[...]
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Page 12
176.4/192kHz sample r ates: Connector 1 = channels 1 and 2 Connector 2 = channels 3 and 4 ADA T™ lightpipe cabl es ar e availabl e fr om your loc al dealer, or in the UK fr om Studiospares (t el +44 (0)20 74821692): stock number 585-510. W or d Clock In and Out The internal ADC can be synchr onised to an external wor d clock. By pr essing the fr [...]
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Page 13
Level Pr ofes sional micr ophones tend to have l ow output impedances and so mor e lev el can be achiev ed by selecting the higher impedance positions of the ISA 828 mic pr e-amp. F requency r esponse Micr ophones with defined pr esence peaks and tail or ed fr equency r esponses can be further enhanced by choosing l ower impedance settings. Choosin[...]
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Page 14
Impedance Setting Quick Guide In general, the f ollowing sel ections will yield these r esults: High mic pr e-amp impedance settings · Will generate mor e overall l evel · Will tend to mak e the lo w- and mid-frequency r esponse of the microphone flatt er · Will impr ove the high-fr equency response of the micr ophone. Low pr e-amp impedance set[...]
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Page 15
x8 Digital Storage Medium Pr o T ools HD™ 192 Interface AES/EBU 25-pin Inputs (r equir es 2 car ds) Cabl e pinout acc or ding to Appendix 1 W or d Cl ock Output (1x or 256x) ISA 828 Digital Car d in 2-wir e mode (Jumpers in def ault ‘enabled’ position) 15 Recor ding with Inserts Recor ding from AES Outputs 1-8 to Pr o T ools HD ™ at 192kHz [...]
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FA Q s Q: What ar e the basic featur es of the ISA 828? A: Eight F ocusrite mic pr es, eight line inputs, f our instrument inputs, optional 8-channel 192kHz A/D conv ersion. Q: Which applications is the ISA 828 suitable f or? A: The ISA 828 can be used as a multi-channel high quality fr ont end f or Digital Audio W orkstations, all owing multi- cha[...]
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Q: What r ear panel connections ar e featur ed? A: The ISA 828 has 8 XLRs for c onnecting micr ophones and 8 1/4” TRS Jack line-le vel inputs. Ther e ar e also 2 25-pin D-type connector s: one for the anal ogue outputs and another for sending an e xternal signal to the optional ADC (mos t likel y if using the Insert switches on the fr ont panel a[...]
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Specifications Mic Input Response • Gain range = 0dB to 60dB in 10dB steps • Input Impedance, variabl e as foll ows:- Switched Impedance setting Equival ent Input Impedance at 1kHz Low 600 ISA 110 1400 Med (Medium) 2400 High 6800 • EIN (equivalent input noise) = -126dB measur ed at 60dB of gain with 150 Ohm terminating impedanc e and 22Hz/22k[...]
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Page 19
W arranty All F ocusrite pr oducts ar e co ver ed by a warranty against manuf acturing def ects in material or craftsmanship f or a period of one year fr om the date of pur chase. Focusrite in the UK, or its authorised dis tributors worldwide, will do their bes t to ensur e that any fault is r emedied as quickly as possibl e. This warranty is in ad[...]
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Appendix 1 Recor ding AES Outputs 1-8 to Pro T ools ™ HD at 192kHz T o recor d all eight channels digitally t o Pro T ools™ HD at 192kHz, all eight AES channels need to be enabl ed on the ISA 828 (default jumper positions shown on Appendix 2) and 2 Digit al car ds must be fitted in the HD192 int erfac e. A 25-pin to two 25-pin cabl e must then [...]
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Page 21
21 Appendix 2 Digital Car d Jumper Positions - Disabling AES Outputs 5-8 F our jumpers on the digital c ar d can be made to disabl e channels 5-8 on the AES Output. This is so that a standar d 25-pin to 25-pin Pr o T ools™ cable c an be used to r ecor d channels 1-4 at 192kHz. (Half of the connections on the Digidesign Digital Input ar e used f o[...]