SPL Crescendo Duo v2
Dual-channel microphone preamplifier featuring 120V Technology
Crescendo duo combines the precise sound that German Rundfunk-Technik is famous for with the innovative SPL 120V technology.
The internal operating voltage of 120 volts allows Crescendo microphone preamplifiers to break completely new ground. This results in microphone preamps that create a detail-rich, vivid and equally honest sound image.
Crescendo duo lets microphones shine in a whole new light " because they have never been amplified like this before.
The 120V technology
The 120V technology is our reference technology. The 120V technology is unique in the world. It operates at a DC voltage of 120 volts. This is four times that of IC-based semiconductor op-amps.
The highest possible audio quality requires the highest possible audio operating voltage.
The 120V technology works with +/-60 V. To be able to handle such a high voltage, we have developed special proprietary operational amplifiers that can operate with a DC voltage of +/-60 V: the SPL 120V SUPRA operational amplifiers.
This high voltage would destroy conventional components and operational amplifiers.
The 120V technology achieves exceptional technical specifications and sonic benefits. Technically, in terms of dynamic range, signal-to-noise ratio and headroom. Sonically, in terms of richness of detail and an absolutely relaxed listening experience.
By the way, the "120V" in the name of the technology has nothing to do with the local mains voltage from the mains power socket. This is about the operating voltage inside the device with which the audio signals are processed.
The mains voltage from the mains power socket is transformed to the required secondary voltage in the device?s internal linear power supply with toroidal transformer. Rectifiers convert this AC voltage into DC voltage required in the audio device.
The idea for SPL 120V technology and the SUPRA operational amplifier based on this technology were developed in the 1990s by SPL founder and chief developer Wolfgang Neumann.
With the goal of building the best mastering console ever, this basic technological philosophy then took shape for the first time " thus the SPL MMC1 Mastering Console for Galaxy Studios saw the light of day in 2000.
The outstanding sonic and technical features quickly got around in the scene " so further orders were not long in coming.
Besides the MMC 1, another legendary product with 120V technology was created with the PQ, the ?King of Parametric Equalizers?.
Since that time, 120V technology has been the foundation for all SPL premium products. Meanwhile, not only for mastering applications, but also for the, studio or hifi use.
Most audio devices work with an internal operating voltage of +/-15 volts and can thus process a maximum input level of +21.5 dBu. If a DAC, for example, has an output level of +22 dBu at 0 dBFS, level peaks of the music material would already cause overloads in the input stage of the device.
All components in the audio device often operate at their limits. The result is an unsteady sound that causes stress and faster ear fatigue.
SPL devices with 120V technology can handle input levels of +32.5 dBu thanks to the higher internal operating voltage of +/- 60 volts " thus offering 12 dB more headroom. All components consequently operate continuously in the optimum operating range. The result is a very pleasant, natural and relaxed sound experience. So you can enjoy your music in every detail.
The 48V switch activates the required phantom power of 48 volts for the use of condenser microphones.
With this switch the level displayed in the VU meter can be adjusted by -10 dB. This is very handy to display high levels.
Activating the polarity reversal switch turns the polarity of a microphone signal by 180°.
A high-pass filter with 6 dB per octave reduces subsonic noise below 120 Hz.
The gain is adjusted by a 12-step switch. The pre-amplification ranges from +18 dB to +70 dB.
The switchable output control allows level adjustment to sub- sequent devices. The control range is +/- 10 dB. This results in a total gain of 80 dB.
By activating the PAD, the input sensitivity can be reduced by 20 dB. This allows the preamplifier to be ideally adapted to high level input signals.
Tip: With PAD activated, Crescendo duo is also ideal for line-level input signals.
Built-in Output Splitter
Both microphone preamps have two parallel outputs each. An additional external signal splitter for back-up systems during a recording session is therefore no longer necessary.
Looks great, feels great " and lasts for a lifetime
The Crescendo duo v2 has a 4 mm thick, black anodized aluminum front panel and aluminum knobs milled from solid. The housing is made of high-quality steel and is powder-coated in elegant black.
With all SPL devices we develop not only according to plan, but also by ear.
Many important components are installed on the circuit boards using Through-hole technology. This way we can ensure that we can use the best sounding components.
Analog input & output; XLR (balanced)
Maximum output level : 32.5 dBu
Input impedance : 10 k?
Output impedance : 75 ?
Frequency range (-3dB) : 20 Hz " 100 kHz
THD + N (10 Hz " 22 kHz, 30 dB Gain) : 0.0036 %
THD + N (10 Hz " 22 kHz, 70 dB Gain) : 0.32 %
Noise (A-weighted, 150 ?, 32 dB Gain) : - 89.2 dBu
Noise (A-weighted, 150 ?, 63 dB Gain) : - 51.7 dBu
E.I.N. (150 ?) : -121.7 dBu
Common mode rejection (1 kHz, 30 dB Gain) : 79 dB dB
Internal Linear Power Supply with Shielded Toroidal Transformer
Operating voltage for audio electronics : +/- 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 500 mA
Fuse for 115 V : T 1 A
Power consumption : max. 17.7 VA
Dimensions & Weight
W x H x D (width x height x depth) : 482 x 88 x 300 mm - 19 x 3.46 x 11.8 inch
Unit weight : 6.1 kg - 13.45 lbs
Shipping weight (incl. packaging) : 7.5 kg - 16.54 lbs
Reference: 0 dBu = 0.775V. All specifications are subject to change without notice.
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