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PRO EARS® Advanced Hearing Protection Technology

Dynamic Level Sound Compression™
Only Pro Ears models of electronic hearing protection/amplification muffs feature 'DLSC™' Dynamic Level Sound Compression Technology. This superior technology allows the wearer to hear every sound even during high volume noise spikes. While other brands say they have 'compression' technology, they do not. What they do have is outdated technology, either 'Peak Clipping' or 'Automatic Level Control'. 'Peak Clipping' turns the amplification system off when noise levels reach a preset decibel leaving the wearer with passive muffs. 'ALC' simply reacts to high noise levels by lowering the unit's volume so the louder sounds still drown out softer sounds. In both technologies loud noise levels compromise the ability to hear quieter sounds. Only Ridgeline's 'DLSC' technology protects hearing while at the same time allowing the wearer to hear lower volume sounds such as normal conversation. 'DLSC' works by instantly 'compressing' all noises over the 70 dB threshold by 50% to a safe level while amplifying all sounds below that to 70 dB. The result is the wearer will hear everything, including conversation, while simultaneously being protected from dangerous, high volume sounds.


Block 1 - Gain and Volume Control
This block amplifies the microphone. The gain can be adjusted from 0 dB to 40 dB.

Block 2 - High Pass Filters
Cuts the low frequencies below 300Hz, eliminating most of the wind noise and other low frequencies.

Block 3 - Dynamic Level Sound Compression (DLSC™)
This circuit automatically adjusts or compresses the input signal by as much as 45 dB. The DLSC will automatically adjust the internal gain in order to maintain the safe output level of 85 dB.

Block 4 - Low Pass Filters
Limits the high frequencies that are allowed to pass. The 3 dB point is at 5Khz.

Block 5 - Speaker Amp
This stage provides the high output current required to drive the speaker with no distortion.

The Dual Layer, Printed Circuit Boards with extensive ground planes make it immune to interferences caused by Radios, TV, Ham stations and other sources. The All-Surface Mount Design uses the highest quality parts available and is based on five, low power Integrated Circuits allowing the unit to consume less than 4 Ma with a battery life of more than 200 hours.