Levelmax Panel; About The Transducer Thermal Limiter - Crown 2/300 Operation Manual

LevelMAX Panel

The LevelMAX panel contains the entire LevelMAX suite of limiters, which consist of a peak
voltage limiter, RMS power limiter, and transducer thermal limiter (see
The LevelMAX panel can be accessed by double-clicking the LevelMAX button from the Main
CDi DriveCore Control panel (see
Available options/parameters:
• LevelMAX (Off, On)
Turns the limiters on or off.
• Mode (Auto, Advanced)
Sets whether certain parameters will be set automatically or available
for manual configuration. The following Mode options are available:
Auto Mode – When this option is selected, the software
determines the best settings based on the signal characteristics.
You can modify only the RMS Threshold, Thermal Threshold,
and Thermal Time Constant. All other parameters will be set
automatically.
Advanced Mode – Selecting this option allows the
parameters which are set automatically when "Auto" mode is
selected to be manually adjusted. This includes Peak Threshold,
Peak Release, and RMS Release.
• Peak Threshold (1 – 200 VPK)
Sets the peak level, in absolute voltage, which the limiter will allow
from the amplifier. In Automatic mode, the Peak Threshold value is automatically determined from the defined RMS threshold and the low pass
frequency defined in the crossover.
• Peak Release (0 – 10 seconds)
Sets the release time of the peak limiter. The release time is defined as the time it takes the limiter to increase the output signal by 20dB.
• RMS Threshold (1 – 400 VRMS)
Sets the RMS level, in absolute voltage, which the limiter will allow from the amplifier. The RMS Threshold should be set to correspond to the short
term (2 hour) power handling of the transducer or system.
• RMS Release (0 – 10 seconds)
Sets the release time of the RMS limiter. The release time is defined as the time it takes the limiter to increase the output signal by 20dB.
• Thermal Voltage (1 – 500V)
Sets the long-term output power limit of the amplifier to what the loudspeaker load can handle without overheating and going into thermal
compression. This is based on the AES power/voltage ratings of drivers outlined in the AES2-2012 standard.
• Thermal Response (1 – 600 sec)
Sets the time it takes for the thermal limiter to adjust output voltage. This is based on the AES power/voltage ratings of drivers outlined in the AES2-
2012 standard.
• Metering
These meters display levels in dBFS and include Amp Output (peak level on the left meter and RMS level on the right), Gain Reduction (peak, RMS,
and total), and Thermal Limiting amount. The Transducer Thermal Limiting indicator lights to indicate the Thermal Threshold has been exceeded.
For more information on the LevelMAX limiters and how to set the parameters, see the LevelMAX white paper available at www.crownaudio.com.

About the Transducer Thermal Limiter

The Transducer Thermal Limiter limits the long-term output power of the amplifier to what the loudspeaker load can handle without overheating and
going into thermal compression. You can set the voltage level at which the thermal limiter engages, and the thermal response time. Your loudspeaker
manufacturer might be able to provide this information.
CDi DriveCore Series Operation Manual
).
Figure 54
Using HiQnet Audio Architect
).
Figure 55
Figure 54:
LevelMAX button
Figure 55:
LevelMAX panel
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