Important Safety Instructions
Safety symbols used in this product
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.
