SPL / Crescendo Duo

A two-channel microphone preamplifier featuring SPL's 120V technology and a fully balanced signal flow.

*This product requires an AC 115V 50/60Hz outlet. Please note that it will not function correctly with a standard household outlet (AC 100V) without voltage boosting.

The input stage utilizes 10 pairs of matched PNP transistors (differential input transistors) to achieve extremely low noise and high common-mode rejection. Each input stage uses six 5th generation 120V SUPRA operational amplifiers.

The transformerless input/output stage design ensures highly linear amplification. The output stage operates as a current amplifier, providing Class-A operation with a quiescent current of 6mA or more.

■Main Features

・Employs SPL 120V technology

・Fully balanced signal flow

・Uses 10 pairs of matched PNP transistors (differential input transistors)

・48V phantom power, phase switching, pad, VU meter

■Specifications

・Input impedance: 10 kOhm

・Output impedance: 75 Ohm

・Frequency range (-3dB): 20 Hz - 100 kHz

・THD + N

10 Hz - 22 kHz, 32 dB Gain: 0.002%

10 Hz - 22 kHz, 63 dB Gain: 0.001%

・Noise (A-weighted)

150 Ohm, 32dB Gain -94 dB

150 Ohm, 63dB Gain -67.5 dB

・CMRR: 88dBu/1kHz

・E.I.N: 150 Ohm: -130.5 dBu



・Dimensions & Weight

W x H x D: 482 x 88 x 300 mm 6.1kg