EC-2 96kHz A/D/D/A upgrade • appendix A
A-2 EC-2 Manual
Important Safety InstructionsSafety symbols used in thisproduct
This symbol alerts the user that there are
important operating and maintenance
instructions in the literature accompanying
this unit.
This symbol warns the user of uninsulated
voltage within the unit that can cause
dangerous electric shocks.
All safety warnings in the HD24 manual (pages 7
through 10) apply to the EC-2 as well.
CE Declaration of Conformity
For the CE Declaration of Conformity, please visit
the Alesis web site at: www.alesis.com
About the EC-2
The EC-2 is an optional 96kHz sampling rate analog
hardware upgrade designed exclusively for the
Alesis ADAT HD24. It provides 24 simultaneous
channels of balanced +4 dBu analog audio inputs
and outputs via 48 1/4” TRS type jacks. The EC-2 is
installed directly inside the HD24’s rear panel, in
place of the original A/D and D/A boards, for
simple system integration and flexibility. With the
EC-2 installed, the HD24 can record and play back
digital audio at the 96kHz or 88.2 kHz sampling
rates (in addition to the standard 44.1 and 48 kHz
rates) via its analog inputs and outputs. In high
sample rate mode, the HD24 can record and play
back up to 12 tracks at a time.
The EC-2 expansion cards are designed for use
only with HD24 software version 1.05 or higher.
If your HD24 has a lower software version, visit
our web site at www.alesis.com to download the
latest HD24 software and instructions for
updating the HD24 via a standard MIDI file or via
Ethernet. If you don’t have a computer or MIDI
sequencer, contact your Alesis dealer or local
service center to help you with the upgrade.
The EC-2 upgrade boards are a replacement for the
standard HD24 analog converter boards. They do
everything the standard boards do, plus:
• 24 channels of High Performance 24-bit
Analog Audio Conversion. 24 channels of
simultaneous input and output on 1/4” TRS
jacks. Superior DACs and ADCs allow the EC-2
to considerably surpass the standard converter
boards in THD+N and dynamic range.
• Support for Sample Rates up to 96kHz. The
EC-2 boards allow you to use analog inputs and
outputs at 88.2kHz and 96kHz nominal sample
rates.
• Simple hookup and operation. The EC-2 is
designed to install in the rear panel of the HD24
and connects to the main circuit board with the
included multi-pin ribbon connectors. Once
connected, the HD24 will detect the cards’
presence, and allow you to select analog inputs
as the source when using the 88.2kHz and
96kHz sample rates.