SPL Crescendo 120V Eight Channel Microphone Preamplifier User Manual
- June 6, 2024
- spl
Table of Contents
Crescendo
120V Eight Channel Microphone Preamplifier
Manual
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Crescendo
Eight-Channel Microphone Preamplifier with 120V Technology
The Crescendo 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. Each of the eight
input stages has six 5th generation 120V SPL SUPRA Operation Amplifiers.
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.
Startup
-
Read the security advice on page 6.
-
Make sure that the selected mains voltage of the Crescendo is according to the mains voltage of your region.
-
Make sure that the mains switch on the rear of the Crescendo is set to Off (Off = O / ON = I).
-
Connect the supplied power cord to the Crescendo and an appropriate main socket outlet.
If the supplied power cord does not match your main socket outlet, please contact your dealer. -
Please connect the outputs of the Crescendo to the inputs of your audio interface or mixing console.
-
Connect your microphones to the inputs 1 to 8 of the Crescendo with high-quality microphone cables.
Microphone cables not included in the scope of delivery. -
Switch on mains on the rear of the Crescendo (On = I). The VU meter light up.
-
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 microphones – switch off the phantom power! -
Use the Mic Gain control to adjust the preamplification gain.
-
The polarity of a microphone signal can be inversed (180°) with the Polarity Universal switch.
-
If the input signal is too hot, switch on PAD. This reduces the level by 20dB.
-
You can make the VU Meters less sensitive by activating the VU -10dB switch.
Power down -
Switch off mains on the back of the Crescendo (Off = O).
The VU Meter no longer light up.
Specifications
Frequency range
20-70kHz -3dB| CMRR
80dBu/1kHz
---|---
Mic pre amp gain
70 dB (adjustable with potentiometer)| THD/N
(10 Hz – 22 kHz, 30dB Gain) 0.008%
Input impedance
10 kOhm| E.I.N
(60dB Gain) 150 Ohm -129.7 dBu
Output impedance
75 Ohm| Power consumption
230V: 60 W
115V: 80 W
Noise (A-weighted)
(150 Ohm, 60dB Gain) -69.7 dBu
(150 Ohm, 30dB Gain) -87.5 dBu|
Security Advice
Before starting up the device:
- Read thoroughly and follow the security advice.
- 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
main 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 occurs, immediately turn off the power
switch and disconnect the electric plug from the main 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.
XLR output connector
Touching the open pins of the XLR output connector may result in an
uncomfortable feeling.
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 main 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
powering on or off the devices, set all volume levels to a 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 main 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 have 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 of 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