SPL Crescendo 8 Channel Microphone Preamplifier

SPL Crescendo 8 Channel Microphone Preamplifier Overview:

The Crescendo is the first microphone preamplifier that works with an internal operating voltage of 120V and breaks new ground.

The Undistortable
Imagine a microphone preamplifier with such a wide dynamic range and high overload resistance that the entire dynamic range of the microphone can be recorded without any limitations.

Imagine that the preamplification electronics themselves have no effect on the sound and you rediscover the sound of your microphones. With absolute signal fidelity and clarity.

VU -10
In the Crescendo, high gains can be used to optimally drive subsequent AD converters. Should the VU meter therefore deflect too far, you can reduce the displayed level by 10 dB.

48 V
The phantom power required for the use of condenser microphones is activated with the 48V switch.

Ø
Turn the polarity of a microphone signal 180° by activating the polarity reversal switch.

Pad
For loud input signals (including line signals) the input sensitivity can be reduced by 20 dB.

Mic Gain
The gain is adjusted by a 12-step switch. The pre-amplification ranges from +18 dB to +70 dB.

Inputs 1 – 8
The input differential amplifiers are constructed with pairs of transistors, each of which is combined in a housing. Precise matching of the transistors and thermal coupling ensure high common-mode rejection and extremely low THD values.

The choice of transistors and resistors has a decisive influence on the sound. In countless listening sessions the optimal components for Crescendo were selected – the effort was worth it!

Outputs 1 – 8
Our 120V SUPRA operational amplifiers work as current amplifiers, which also offer pure class A operation with over 6mA quiescent current. We largely dispense with coupling capacitors in order to avoid their sonic disadvantages (diffuse, sloping, loss of dynamics). In order to eliminate DC voltage components nevertheless, active servo circuits are used.

Alternate DB25 Output
For fast cabling to multi-channel converters, Crescendo offers DB25 connection.

Specifications:

Analog inputs & output; XLR (balanced)

• Maximum input & output gain: 32.5 dBu
• Input impedance: 10 kΩ
• Output impedance: 75 Ω
• Frequency range (-3 dB): 20 Hz – 70 kHz
• THD + N (10 Hz – 22 kHz, 30 dBu): 0.008 %
• Noise (A-weighted, 150 Ω, 30dB Gain): -87.5 dBu
• Noise (A-weighted, 150 Ω, 60dB Gain): -69.7 dBu
• E.I.N. (150 Ω): -129.7 dBu
• Common mode rejection (1 kHz): 80 dB

Internal Linear Power Supply with Shielded Toroidal Transformer

• Operating voltage for analog audio: +/- 60 V
• Operating voltage for relays and LEDs: + 12 V

Mains Power Supply

• Mains voltage (selectable, see fuse chamber): 230 V AC / 50; 115 V AC / 60 Hz
• Fuse for 230 V: T 1.6 A
• Fuse for 115 V: T 3.15 A
• Power consumption: 230 V: 60 W, 115 V: 80 W

Dimensions & Weight

• W x H x D (width x height incl. feet x depth):
• 482 x 132 x 300 mm
• 19 x 5.2 x 11.8 inch
• Unit weight:
• 9.5 kg
• 20.94 lbs
• Shipping weight (incl. packaging):
• 12.25 kg
• 27.01 lbs

Made in Germany