spl 120V Two Channel Microphone Preamplifier User Manual

spl 120V Two Channel Microphone Preamplifier

Crescendo duo
Two-Channel Microphone Preamplifier with 120V Technology

The Crescendo duo features a fully balanced signal flow. The input stage uses 10 pairs of matched PNP Transistors (Differential Input Transistors) for extremely low noise and a very high common mode rejection.

Both input stages have six 5th generation 120V SPL SUPRA Operation Amplifiers each.

The transformerless design of the input/output stages guarantees highly linear amplifying.

The output stages operate as current amplifiers and therefore provide Class-A operation with more than 6mA quiescent current.

Start up

(1) Read the security advices on page 6.
(2) Make sure that the selected mains voltage of the Crescendo duo is according to the mains voltage of your region.
(3) Make sure that the mains switch on the rear of the Crescendo duo is set to Off (Off = O / ON = I).
(4) Connect the supplied power cord to the Crescendo duo and an appropriate mains socket outlet.
If the supplied power cord does not match your mains socket outlet, please contact your dealer.
(5) Please connect the outputs of the Crescendo duo to the inputs of your audio interface or mixing console.
(6) Connect your microphones to the inputs 1 and 2 of the Crescendo duo with high-quality microphone cables. Microphone cables not included in the scope of delivery.
(7) Switch on mains on the rear of the Crescendo duo (On = I). The VU meter light up.
(8) The phantom power required for condenser microphones can be activated with the 48V switch. If phantom power is on, the 48V LED lights up blue.
IMPORTANT: Use phantom power only for condenser microphones. For all other microphone types ­ especially ribbon micorphones ­ switch off the phantom power!
(9) Use the Mic Gain switch to adjust the preamplification gain in 2 to 7dB steps.
(10) The Output Gain controls the output level from -10 to +10dB. With the OUTPUT switch the signal can be completely switched off.
(11) The polarity of a microphone signal can be inversed (180°) with the Polarity Inversal switch.
(12) The High Pass switch activates a high pass filter with 3dB per ocatve at 120 Hz.
(13) If the input signal is too hot, switch on PAD. This reduces the level by 20dB.
(14) You can make the VU Meters less sensitive by activating the VU -10dB switch.
Power down
(15) Switch off mains on the back of the Crescendo duo (Off = O).
The VU Meter no longer light up.

Specifications

Frequency range
20-100kHz (32dB Gain) -3dB
Mic pre amp gain
70dB (in 2 to 7 dB steps)
Output gain
+/- 10dB
Input impedance
10 kOhm
Output impedance
< 600 Ohm
Noise (A-weighted)
(63dB Gain) -67.5dBu
(32dB Gain) -94 dBu
Noise FFT
(63dB Gain) -97dBu
(32dB Gain) -125dBu
CMRR
(63dB Gain) > 65dBu/1kHz
(32dB Gain) > 88dBu/1kHz
THD/N
(63dB Gain) 0.001%
(32dB Gain) 0.002%
(18dB Gain) 0.0002%
E.I.N
(63dB Gain) 150 Ohm -131.2dBu
(32dB Gain) 40 Ohm -126.4dBu
Power consumption
230V: 17.7 W
115V: 20 W
Fuses
230V 315mA (Fast)
115V 630mA (Fast)

Security Advices
Before starting up the device:

• Read thoroughly and follow the security advices.
• Read thoroughly and follow the Quickstart.
• Observe all warning instructions on the device.
• Please keep the user manual as well as the security advices in a safe place for future reference.

Warning

Always follow the security advices listed below to avoid serious injuries or even deadly accidents due to electric shocks, short circuit, fire or other dangers. The following are examples of such risks and do not represent an exhaustive list:

Power supply/Power cord
Do not place the power cord near heat sources such as heaters or radiators and do not excessively bend or otherwise damage the cord, do not place heavy objects on it, or place it in a position where anyone could walk on, trip over, or roll anything over it. Only use the voltage indicated on the device. Only use the supplied power cord/plug. If you intend to use the device in an area other than in the one you purchased it, the included power cord may not be compatible. In this case please contact your dealer. Be sure to connect the device to an appropriate mains socket outlet with a protective grounding connection. Improper grounding can cause electrical shock.

Do not open
This device contains no user-serviceable parts. Do not open the device or attempt to disassemble the internal parts or modify them in any way. If it should appear to be malfunctioning, turn off the power immediately, unplug the power cord from the mains socket outlet and have it inspected by a qualified professional.

Water warning
Do not expose the device to rain, or use it near water or in damp or wet conditions, or place anything on it (such as vases, bottles or glasses) containing liquids which might spill into any openings. If any liquid such as water seeps into the device, turn off the power immediately and unplug the power cord from the mains socket outlet. Then have the device inspected by a qualified professional. Never insert or remove an electric plug with wet hands.

Fire warning
Do not put burning items, such as candles, on the unit. A burning item may fall over and cause a fire.

Lightning
Before thunderstorms or other severe weather, disconnect the device from the mains socket outlet; do not do this during a storm in order to avoid life threatening lightning strikes. Similarly, disconnect all the power connections of other devices, antenna and phone/ network cables which may be interconnected so that no damage results from such secondary connections.

If you notice any abnormality
When one of the following problems occur, immediately turn off the power switch and disconnect the electric plug from the mains socket outlet. Then have the device inspected by a qualified professional.

• The power cord or plug gets frayed or damaged.
• The device emits unusual smells or smoke.
• An object has fallen into the unit.
• There is a sudden loss of sound during the use of the device.

Caution
Always follow the basic precautions listed below to avoid the possibility of physical injury to you or others, or damage to the device or other property. These precautions include, but are not limited to, the following:

Power supply/Power cord
When removing the electric plug from the device or an mains socket outlet, always pull on the plug itself and not the cord. Pulling the cord may damage it. Unplug the device from the mains socket outlet when the device is not used for a while.

Location
Do not place the device in an unstable position where it might accidentally fall over. Do not block the vents. This device has ventilation holes to prevent the internal temperature from rising too high. In particular, do not place the device on its side or upside down. Inadequate ventilation can result in overheating, possibly causing damage to the device or even fire.
Do not place the device in a location where it may come into contact with corrosive gases or salty air. This may result in malfunction.
Before moving the device, remove all connected cables. When setting up the device, make sure that the mains socket outlet you are using is easily accessible. If some trouble or malfunction occurs, immediately turn off the power switch and disconnect the plug from the mains socket outlet. Even when the power switch is turned off, electricity is still flowing to the product at a minimum rate. When you are not using the device for a long time, make sure to unplug the power cord from the wall mains socket outlet.

Connections
Before connecting the device to other devices, power down all devices. Before power on or off the devices, set all volume levels to minimum. Only use appropriate cables to connect the device with other devices. Make sure that the cables you use are intact and comply with the electrical specifications of the connection. Other connections can lead to health risks and damage the equipment.

Handling
Operate the controls and switches only as described in the manual. Incorrect adjustments outside safe parameters can lead to damage. Never use excessive force on the switches or controls.
Do not insert your fingers or hands in any gaps or openings of the device.
Avoid inserting or dropping foreign objects (paper, plastic, metal, etc.) into any gaps or openings of the device. If this happens, power down immediately and unplug the power cord from the mains socket outlet. Then have the device inspected by a qualified professional.
Do not expose the device to excessive dust or vibrations or extreme cold or heat (such as direct sunlight, near a heater or in a car during the day) to prevent the possibility of causing damage to the housing, the internal components or unstable operation. If the ambient temperature of the device suddenly changes, condensation can occur (if for example the device is relocated or is affected by a heater or air conditioning).
Using the device while condensation is present may result in malfunction. Do not power on the device for a few hours until the condensation is gone. Only then it is safe to power on.

Cleaning
Disconnect the device from your mains socket outlet before cleaning. Do not use any solvents, as these can damage the chassis finish. Use a dry cloth, if necessary, with an acid-free cleaning oil.

Disclaimer
Windows® is a registered trademark of Microsoft® Corporation in the United States and other countries. Apple, Mac and Macintosh are trademarks of Apple Inc., registered in the U.S. and other countries. The company names and product names in this manual are the trademarks or registered trademarks of their respective companies. SPL and the SPL Logo are registered trademarks of SPL electronics GmbH. SPL cannot be held responsible for damage caused by improper use or modification of the device or data that is lost or destroyed.

Notes on Environmental Protection
At the end of its operating life, this product must not be disposed with regular household waste but must be returned to a collection point for the recycling of electrical and electronic equipment.
The wheelie bin symbol on the product, user manual and packaging indicates that. For proper treatment, recovery and recycling of old products, please take them to applicable collection points in accordance with your national legislation and the Directives 2012/19/EU. The materials can be reused in accordance with their markings. Through reuse, recycling of raw materials, or other forms of recycling of old products, you are making an important contribution to the protection of our environment.
Your local administrative office can advise you of the responsible waste disposal point. This directive only applies to countries inside the EU. If you wish to discard devices outside the EU, please contact your local authorities or dealer and ask for the correct method of disposal.
WEEE-Reg-No.: 973 349 88

© 2020 SPL electronics GmbH | spl.audio

Read User Manual Online (PDF format)

Read User Manual Online (PDF format)  >>

Download This Manual (PDF format)

Download this manual  >>