Spec Sheet
Cello Audio Metrics
MICROPHONE PRE-AMPLIFIER:
Cello numbers Notes-1
(measured to insert send)
MIC GAIN:
+5dB to +78dB via Combo XLR; Range includes pad in and out
LINE GAIN:
-10dB to +65dB via Combo TRS Range includes pad in and out
PHANTOM POWER:
48 VDC up to 10mA / channel
MIC EIN:
-127dBu (with 150R Z source)
CMRR:
> 80dB (1kHz)
MAXIMUM INPUT LEVEL:
+22dBu via combo-XLR; +30dBu via combo-TRS (with pad)
INPUT IMPEDANCE (Mic):
> 2.4kOhm combo XLR
INPUT IMPEDANCE (Line):
> 12kOhm combo TRS
FREQUENCY RESPONSE:
"+/- 0.3 dB 10Hz to 70kHz
CROSSTALK:
Better than 90dB rejection @ 10kHz
THD+N @ 0dBu (1kHz):
-103dB (22Hz to 20kHz) Referred to +22dBu; Av = 5dB ; pad in
SNR:
117dB (22Hz to 20kHz) A-weighted Referred to +22dBu; Av = 5dB ; pad in
Pad:
20dB
HPF:
Fc (-3dB = 100Hz) 20dB / decade First order 20dB/decade
XLR: Pin 2 (Hot), Pin 3 (Cold) & Pin 1 (Shield)
1/4” JACK: TIP (Hot), RING (Cold) & SLEEVE (Shield)
INSTRUMENT IN
(Measured to SPIDF out )
INSTRUMENT GAIN:
-infinity to +20dB
MAXIMUM INPUT LEVEL:
24dBu
INPUT IMPEDANCE: 1MOhm Unbalanced
FREQUENCY RESPONSE: "+/-0.2dB 10Hz to 20kHz
THD+N @ 0dBu (1kHz):
-107dB 0.00045%
SNR:
113dB 0.00022%
1/4” JACK: TIP (Hot) & SLEEVE (Shield)
INSERT SENDS (Mic Pre Out):
MAXIMUM OUTPUT LEVEL:
"+22dBu
OUTPUT IMPEDANCE:
200 Ohm balanced
1/4” JACK: TIP (Hot), RING (Cold) & SLEEVE (Shield)
ADC LINE INPUTS (Insert Returns):
(measured at optical output under AES-17)
MAXIMUM INPUT LEVEL:
"+22dBu
DIGITAL REFERENCE LEVEL: 0dBFS = +22dBu
INPUT IMPEDANCE:
10k Ohm
FREQUENCY RESPONSE:
"+/- 0.3 dB 10 to Nyquist freq (70kHz at octal sample rates)
CROSSTALK:
not measured
THD+N @ -1dBFS (1kHz):
-106dB rel +22dBu
DYNAMIC RANGE:
120dB rel +22dBu
1/4” JACK: TIP (Hot), RING (Cold) & SLEEVE (Shield)
DAC OUTPUTS (1-2):
(measured from optical input under AES-17)
MAXIMUM OUTPUT LEVEL:
"+22dBu
DIGITAL REFERENCE LEVEL:
0dBFS = +22dBu
OUTPUT IMPEDANCE:
200Ohm balanced
FREQUENCY RESPONSE:
"+/- 0.3 dB 10 to Nyquist freq (70kHz at octal sample rates)
CROSSTALK:
not measured
THD+N @ -1dBFS (1kHz):
-104dB
DYNAMIC RANGE:
127dB
1/4” JACK: TIP (Hot), RING (Cold) & SLEEVE (Shield)