Alesis EC-2 owner manual Specifications

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

EC-2 Manual A-13