SKU: 86434903024

SPL CRESCENDO DUO v2 Dual-Channel Microphone Preamplifier

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Description

SPL CRESCENDO DUO v2 Dual-Channel Microphone PreamplifierCrescendo 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

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 Undistortable

Thanks to the SPL 120V technology, it is almost impossible to overdrive this microphone preamplifier.

Crescendo duo is a dual-channel microphone preamplifier with 120V technology. Both channels feature the same range of functions. Besides phantom power (48 V) for condenser microphones, polarity reversal, a high-pass filter and a PAD switch, they provide the possibility to adjust the VU meter to display very high levels – so they leave nothing to be desired. The gain can be adjusted comfortably and precisely via a 12-step switch. With the switchable output control, the output level of the Crescendo duo can be perfectly adapted to following AD converters. Two outputs per channel allow the signal to be sent to two different devices in parallel. In addition to the extensive feature set and the outstanding technical characteristics, Crescendo duo convinces with a sonic authenticity that is second to none.

48 V

The 48V switch activates the required phantom power of 48 volts for the use of condenser microphones.

VU-10

With this switch the level displayed in the VU meter can be adjusted by -10 dB. This is very handy to display high levels.

Ø

Activating the polarity reversal switch turns the polarity of a microphone signal by 180°.

HP

A high-pass filter with 6 dB per octave reduces subsonic noise below 120 Hz.

Specifications

Analog inputs & outputs; XLR (balanced)

 Input impedance 10 kΩ
Output impedance 75 Ω
Maximum output gain 32.5 dBu
Common Mode Rejection Ratio (1 kHz, 30 dB Gain) 79 dB
Frequency range (30 dB Gain) 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 Ω, 30 dB Gain) - 89.2 dBu
Noise (A-weighted, 150 Ω, 70 dB Gain) - 51.7 dBu
Equivalent Input Noise, EIN (150 Ω)

-121.7 dBu

 

Internal Linear Power Supply with Toroidal Transformer

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

 

Mains Power Supply

 Mains voltage (selectable) 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 W

 

Dimensions & Weight

 W x H x D (width x height x depth) 19 x 3.46 x 11.8 inch
Unit weight 13.45 lbs
Shipping weight (incl. packaging) 16.54 lbs

 

Shipping Notes
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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SKU: 86434903024

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Jennifer L Cremata
San Leandro, US
★★★★★ 5
Very healing
I bought this for face but had also heard that this can be used for other skin issues. Yesterday, I cut my index finger with a label remover (basically a razor blade). Once I stopped the bleeding, I kept it clean and covered for a bit. Before bed, I decided to put a dab of this on my cut, when I woke up this morning, it's like a miracle! It barely hurts and looks quite healed!
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Reviewed in the United States on May 20, 2026
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DWF
Charlottesville, US
★★★★★ 5
It works... very well... for me. VERY WELL.
I typically detest American companies as many of the products contain both harmful and helpful ingredients at the same time. So far, Prequel has EXCEEDED my expectations. PROS: It works for my skin. EWG gives good scores to Prequel also. Skin looks great afterwards. No scent. Lasts for hours with a healthy skin tone. You don't have to use a lot to cover an area (see below). CONS: Slightly greasy when applied so it not a lightweight cream. Small tube (see below). Pricey. You don't have to use a lot. I find that due to its slightly greasy nature, you can use much less to cover a greater area. Afterwards the greasiness disappears, leaving plump, healthy feeling skin texture. As with any skincare product, your skin may react differently. I have tried major Western brands which worsened my skin (Cereva for instance) before switching to Korean & Japanese products (far superior). Prequel is now the only Western brand I will use on a regular basis, to include their bar of soap (superior to my regular Korean brand).
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Reviewed in the United States on September 14, 2025
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UrbanUtah
West Palm Beach, US
★★★★★ 5
Great dry spot treatment!
Worked wonders on winter dry patches on my cheeks and sides of mouth. I’m a somewhat new Prequel product user. I follow the creator on YouTube and love her skincare videos. I have tried a few products so far and have been happy with the results. I just ordered the foot repair ointment for my husband as well. I think this brand is a great value for the money. I have not had any bad reactions so far and I have VERY sensitive skin. This ointment is lightweight and melts into my skin well and the next morning my dry spots were literally invisible. It’s fragrance free, I did not notice any scent at all, which is importance to me.
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Reviewed in the United States on January 3, 2026
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gina
Belleville, US
★★★★★ 4
Prequel is always great
Very soothing and calming for skin. Tube lasted a long time. I have sensitive skin and often have reactions but did great with this.
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Reviewed in the United States on March 14, 2026
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Kitkat
Fort Morgan, US
★★★★★ 5
This is a barrier cream?
I also have very oily skin, so normally I stay away from anything that says barrier or balm. I push skin a lot lol...with max strength tretinoin, glycolic acids, salicylic acids, vitamin C... so there are times when I just need max help from a richer product bc sometimes I take it too far. LRP Cicaplast has been a staple and has saved me many a times. I bought this bc of the high percentage of ectoin, 5%, and it was so reasonably priced. When I squeezed the tube, I was really worried, it was thicker looking than the Cicaplast. However, when I spread it out, it was SO light and a tiny amount --barely a pea size, was enough to coat my face. It did not feel heavy. Even with my oily skin, I think I could wear this everyday. As an experiment, I applied any excess on one side of my hand, as I'm right handed, I would apply it on my left hand. I've had this about a week, and right now after doing the dishes, and washing my hands multiple times without any hand cream on it, my right hand is definitely drier than my left hand. My left hand also looks less red and more calm. This formula is 5 stars for both the effectiveness and the elegant formula. It may yet replace my LRP Cicaplast...we'll see!
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Reviewed in the United States on November 6, 2025

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