API Audio The Channel Strip - Manual (Page 34)

iii. 550A Equalizer Specifications
Insertion Loss: None (bridging)
Frequency Response: ±0.5dB 30Hz to 20kHz
(Unequalized)
Noise: Unequalized output noise of –90dBm high level strapping
–98dBm low level strapping
20Hz to 20kHz unweighted
Distortion: .05% THD max, 30Hz to 20kHz @ +4dBm
.07% THD max, 30Hz to 20kHz @ +18dBm
iv. 325 Line-Driver Specifications
Output Fader Control Gain: -∞ to +10dB
Clipping Level: +30dBu
Channel Output: +4dBu, Balanced, Low-impedance, Male XLR
Output Impedance: Less than 75 Ohms, Transformer Balanced
Metering: 10-segment red LED: VU scale; -20VU to +3VU
(positive illumination indicator)
Switchable between 512C Preamp and 325 Line-Driver outputs
33