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CLRdsp ClearSpeech® DSP Noise Reduction Processor



View Details | Restock Alert. The estimated return to stock date is September 30, 2024.

Hear the Difference

Unaltered CLRspkr
Multiple CW Stations
Unaltered CLRspkr
Weak Phone DX
Unaltered CLRspkr
CW with Heavy QRN

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Unaltered CLRdsp Competitor 1 Competitor 2

See how it works

Learn more about adaptive digital signal processing
See how the adaptive DSP noise reduction algorithms filter noise from a variety of sources

Watch the CLRdsp in action


  • Speaker and headphone amplifier with ClearSpeech® adaptive DSP noise reduction for voice and CW
  • Recognizes intermittent nature of CW and allows it to pass noise free
  • Continuously adjustable noise reduction
  • Contains 11 watt (into 4 ohms) power amplifier
  • Sturdy aluminum case - Ideal for mobile operation as well as home station
  • Powerpole® plugs into any 12V supply
  • Plugs into the speaker or headphone output typically found on Amateur transceivers
  • Low-level input for connection to headphone jack typically found on portable Shortwave receivers
  • Works with stereo (dual mono) or mono headphones. Volume control also adjusts headphone level
  • Line-level output for recording (e.g. using a computer sound card)
  • 1/8 inch phone jack on rear can drive external 8 or 4 ohm loudspeaker
  • On-Off switch with green indicator LED
  • RED LED flashes to indicate "clipping"


Enclosure Aluminum, powder coat painted
Dimensions 1.25" H x 4.25" W x 6" D
Power Requirements 9 to 16 Vdc; 1.1A typical before onset of clipping
Audio Input High impedance, 0.01 VAC
Voltage Gain 46 dB
Audio Output Power 11 watts RMS maximum into 4 ohms @ 13.8VDC
Maximum Audio Ouput Voltage 7.75 Vrms
Input Clipping Level 0.04 volts RMS
Frequency Response (filter enabled) 300 Hz to 3400 Hz
Frequency Response (filter disabled) 300 Hz to 12000 Hz
Noise Reduction Characteristics Adaptive, single tone greater than 50 dB

* Note for use with a vacuum tube audio amplifier: The CLRdsp Speaker Level Input presents a load impedance of approximately 85 ohms at 1 kHz. Contact Support for information on modifications to ensure there is no speaker damage and improved performance.

Quality Declaration

This product has been tested to comply with Part 15 of the FCC rules for a Class B computer peripheral and digital device for use in the home and office. This testing is done to ensure the product does not generate RF interference.

Product designed, tested and used by ham radio operators onsite.


Powerpole® is a registered trademark of Anderson Power Products.
Powerpole® Connector Features & Benefits
  • Genderless Housings: Provide simplified assembly and minimize the number of components
  • Stackable Modular Housings: Available in four sizes to right size your connection need
  • Connection Versatility: Contacts for wire, PCB, or busbar all fit into the same housings
  • Low Resistance Connection: Silver or tin plated contacts inside housings that strongly force the contacts together
  • Color Coded Housings: Help ensure that connectors are assembled and mated correctly
  • Self Securing Design: Stainless steel springs create a robust force between the contacts that holds the connector in the mated condition, but allows it to be quickly disconnected.

Anderson Powerpole® Connectors and General Installation Tips

Powerpole® Connectors
  15A 30A 45A
Amps (UL) Per Pole 0 to 55 0 to 55 0 to 55
Volts (UL) Per Pole 600 600 600
Amps Continuous 15 30 45
Wire Gauge (AWG) 20 - 16 16 - 12 14 - 10
Polarized Housing
PDF Files
Data Sheet
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