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 V
RMS
) = -15 dBFS
Maximum Input Level:
+19 dBu (6.9 V
RMS
) = -0 dBFS
Input impedance:
10 k
Ω
A/D converter:
AKM 5393
Analog filter:
2
nd
-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 V
RMS
) = -15 dBFS
-2 dBu when connected to unbalanced circuit
Maximum Output Level:
+19 dBu (6.9 V
RMS
) = -0 dBFS
+13 dBu when connected to unbalanced circuit
Output impedance:
220
Ω
D/A converter:
AKM 4393
Analog filter:
2
nd
-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
