Owner’s Manual
Eight channel AD Converter for 24bit / 96kHz
8288 475 000
Introduction
The Fostex Model AC2496 is a 24 bit/96kHz compatible (compatible only to S/P DIF)
professional-use 8 channel A/D converter that converts analog input signals to digital
signals (adat or S/P DIF). It can be utilized to increase the number of inputs of Fostex
digital multirecorders D1624/D2424 and for substituting inputs of digital mixers and
personal computers.
Functions of the Model AC2496 can be extended according to the application by employing an optional Model 8355 (AES/EBU card) and Model 5045 (8 channel AD card).
When the 8355 is installed in an AC2496, it is possible to transmit 24 bit/96kHz digital
signals (8 channels) which is otherwise impossible to transmit in ADAT IN/OUT.
If a 5045 is installed, the 8 channel analog inputs of the AC2496 can be extended to 16
channels.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER (OR BACK).
NO USER - SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
"WARNING"
"TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS APPLIANCE TO RAIN OR
MOISTURE."
CAUTION:
TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE OF
PLUG TO WIDE SLOT, FULLY INSERT.
ATTENTION:
POUR EVITER LES CHOCS ELECTRIQUES, INTRODUIRE
LA LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE
CORRESPONDANTE DE LA PRISE ET POUSSER JUSQU'
AU FOND.
The lightning flash with arrowhead symbol, within an equilateral
triangle, is intended to alert the user to the presence of
uninsulated "dangerous voltage" within the product's enclosure
that may be of sufficient magnitude to constitute a risk of electric
shock to persons.
The exclamation point within an equilateral triangle is intended
to alert the user to the presence of important operating and
maintenance (servicing) instructions in the literature
accompanying the appliance.
SAFETY INSTRUCTIONS
1. Read Instructions - All the safety and operating instructions
should be read before the appliance is operated.
2. Retain Instructions - The safety and operating instructions
should be retained for future reference.
3. Heed Warnings - All warnings on the appliance and in the
operating instructions should be adhered to.
4. Follow Instructions - All operating and use instructions should
be followed.
5. Water and Moisture - The appliance should not be used near
water - for example, near a bathtub, washbowl, kitchen sink,
laundry tub, in a wet basement, or near a swimming pool, and
the like.
6. Carts and Stands - The appliance should be used only with a
cart or stand that is recommended by the manufacturer.
An appliance and cart combination should be moved with care.
Quick stops, excessive force, and uneven surfaces may cause
the appliance and cart combination to overturn.
7. Wall or Ceiling Mounting - The appliance should be mounted to
a wall or ceiling only as recommended by the manufacturer.
8. Ventilation - The appliance should be situated so that its location
or position dose not interfere with its proper ventilation.
For example, the appliance should not be situated on a bed,
sofa, rug, or similar surface that may block the ventilation
openings; or, placed in a built-in installation, such as a bookcase
or cabinet that may impede the flow of air through the ventilation
openings.
9. Heat - The appliance should be situated away from heat sources
such as radiators, heat registers, stoves, or other appliances
(including amplifiers) that produce heat.
10. Power Sources - The appliance should be connected to a power
supply only of the type described in the operating instructions or
as marked on the appliance.
11. Grounding or Polarization - The precautions that should be taken
so that the grounding or polarization means of an appliance is
not defeated.
12. Power Cord Protection - Power supply cords should be routed
so that they are not likely to be walked on or pinched by items
placed upon or against them, paying particular attention to cords
at plugs, convenience receptacles, and the point where they
exit from the appliance.
13. Cleaning - The appliance should be cleaned only as
recommended by the manufacturer.
14. Nonuse Periods - The power cord of the appliance should be
unplugged from the outlet when left unused for a long period of
time.
15. Object and Liquid Entry - Care should be taken so that objects
do not fall and liquids are not spilled into the enclosure through
openings.
16. Damage Requiring Service - The appliance should be serviced
by qualified service personnel when:
A. The power supply cord or the plug has been damaged; or
B. Objects have fallen, or liquid has been spilled into the appliance; or
C. The appliance has been exposed to rain; or
D. The appliance does not appear to operate normally or
exhibits a marked change in performance; or
E. The appliance has been dropped, or the enclosure damaged.
17. Servicing - The user should not attempt to service the appliance
beyond that described in the operating instructions.
All other servicing should be referred to qualified service
personnel.
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Table of Contents
Safety instructions..................................................................................................................2
Names and functions of each section..................................................................................4
Main features of the AC2496..................................................................................................5
AC2496 without the option installed.....................................................................................6
AC2496 with the Model 5045 installed.................................................................................6
AC2496 with the Model 8355 installed.................................................................................6
Application examples as Analog - adat converter..............................................................7
Connecting example for 16 track simultaneous recording................................................7
Setup of the AC2496.................................................................................................................7
Application examples as an Analog - S/P DIF converter....................................................8
Connecting example when substituting
the input of personal computers (audio card)................................................8
Setup of the AC2496.................................................................................................................8
Using the AC2496 as a digital master ....................................................................................8
Extension example after installing a Model 5045................................................................9
Connecting example for 24 track simultaneous recording................................................9
Setup of the AC2496.................................................................................................................9
Extension example after installing a Model 8355.............................................................10
Connecting example...............................................................................................................10
Setup of the AC2496...............................................................................................................10
Specifications (AC2496 / 5045 / 8355).................................................................................1 1
3
Names and functions of each section
1
2
45 6 7
3
1. Power switch/Power LED
The main power switch for the AC2496.
The power LED (green) will light when power is
switched ON.
2. WORD IN termination switch
This must be switched ON when input signals from
WORD IN is to be terminated by 75 ohms.
3. LOCKED indicator
This will light up when the CLOCK switch is set to
"WORD" and locked onto the external WORD clock.
4. Clock switch
This is for setup of the AC2496 operating clock.
"INT" Operates by the AC2496 crystal.
"WORD" Synchronizes with the external WORD clock.
5. Digital format selecting switch
This selects the digital output format (adat, S/P DIF
or AES/EBU). It can also be selected to 44.1kHz, 48kHz,
88.2kHz or 96kHz (44.1/48kHz only for adat output).
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6. Reference level selecting switch
This switch selects the reference level (all channels
simultaneously) of the analog input (balance or unbalance). Both balance and unbalance can be selected
to -20dB/-18dB/-12dB (Refer to <Notes> on the next
page).
7. Analog input mode selecting switch
This switch becomes effective when the DIGITAL FORMAT switch is set to "adat" and if the optional Model
8355 has been installed; the signal applied to the analog input connector can be assigned to the desired
channel. In general, these are selected in accordance
to the number of BUSS OUT of a connected analog
mixer.
<Notes on switching>
Always switch off the main power to the AC2496
before changing the various selecting switches.
If the switches are manipulated with the main
power switched on, it could create noise.
910
11
8. Blank panel
This blank panel is removed when installing the optional Model 8355 (AES/EBU card) or the Model 5045
(8 channel AD card). In regards to installation of the
options, refer to the manual included with the cards.
9. DIGITAL OUT 1-8 connectors (Optical)
Digital equipment provided with optical DIGITAL IN
are connected here. The type of digital signals (adat
or S/P DIF) selected by the DIGITAL FORMAT switch
will be output here.
10. WORD IN connector (BNC type)
The WORD clock signal from external digital equipment is input here to match the phase with digital
equipment provided with WORD OUT.
11. AC IN connector
The AC cable included with the AC2496 is connected
here.
13
12
12. WORD OUT connector (BNC type)
The AC2496 WORD clock signal for external digital
equipment is output here.
13. Analog input connector (TRS phone jack)
This is connected to BUSS OUT (or GROUP OUT) of
the analog mixer (Refer to <Note> on the next page).
These connectors can accept both balanced (+4dBu)
and unbalanced (-10dBV) analog signals.
T: HOT
R: COLD
S: GND
<Notes when connecting cables>
When plugging or unplugging the interconnecting
cables, be sure to do so after switching off the power
to the AC2496.
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