EC-2 Manual A-13
Specifications

For the Alesis HD24 with EC-2 96 kHz Sample Rate Upgrade A/D and

D/A Converter Boards:

AUDIO INPUT

Input Connectors: 24 balanced 1/4" TRS jacks
Nominal Input Level: +4 dBu (1.23 VRMS) = -15 dBFS
Maximum Input Level: +19 dBu (6.9 VRMS) = -0 dBFS
Input impedance: 10 kΩ
A/D converter: AKM 5393
Analog filter: 2nd-order Butterworth filter w. 96 kHz corner frequency
Latency (analog in to digital out): Approximately 45 samples (<1 ms. @ 48 kHz)

AUDIO OUTPUT

Output Connectors: 24 balanced 1/4" TRS jacks
Nominal Output Level: +4 dBu (1.23 VRMS) = -15 dBFS
-2 dBu when connected to unbalanced circuit
Maximum Output Level: +19 dBu (6.9 VRMS) = -0 dBFS
+13 dBu when connected to unbalanced circuit
Output impedance: 220 Ω
D/A converter: AKM 4393
Analog filter: 2nd-order Butterworth filter w. 96 kHz corner frequency
Latency (digital in to analog out): Approximately 32 samples (<0.7 ms. @ 48 kHz)

AUDIO PERFORMANCE

Signal to Noise Ratio: 112 dB A-Weighted, Analog In to Analog Out
THD+N: ≤ 0.002%
Frequency Response: 22-44 kHz ±0.50 dB
Throughput delay (analog in to analog out):
Approximately 77 samples (0.8 milliseconds @ 96 kHz, 1.6
milliseconds @ 48 kHz)
Sampling rates: 44.1, 48, 88.2, and 96 kHz (each variable ±12%)
Channel to Channel Gain Match ±0.50 dB
All measurements done over a 22 Hz - 22 kHz range with 1 kHz sine wave at +18dBu (-1dBFS) input unless
otherwise specified. Impedances are measured at 1 kHz.
© 2002 Alesis. Specifications Subject To Change Without Notice. All rights reserved. Reproduction in whole or in part is prohibited.
7-51-0107-A 6/2002