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PT-9A+ Kit


The all new PT-9A+ Polarity Tester is an essential measurement tool for building and tuning great car audio systems. It’s critical to identify/verify the correct polarity of speakers before and after installation. It’s also important to understand the polarity of the electrical signals that connect to the speakers in OEM audio integration, as well as correctly identifying which wires correspond to which speaker locations. The PT-9A+ does all of that in a compact, easy-to-use tool. Cancellation between audio signals (acoustic or electrical) is the number one problem that plagues most car audio systems which exhibit poor sound performance.  When all of the audio system’s signals and speakers are correct in polarity, only then can you do effective tuning for optimum sound quality.


The PT-9A+ has a safe, low voltage output pulse that means no damage to CAN Bus wires, Air Bag wires or other sensitive circuits if you mistake other vehicle wiring for audio signal or speaker wiring. No more popping speakers with power tool batteries, please! If you do any kind of audio system installation, particularly OEM audio integration, the PT-9A+ is a tool you can’t be without.



  • Built-In Selectable Pulse Generator - Preamp Level (RCA) and Speaker Level Jacks
  • Built-In Compact Microphone for Testing/Verifying Acoustic Speaker Polarity
  • Speaker Level Jacks can be configured as Inputs for Electrical Signal Polarity Testing
  • Low Volume Threshold for Safe Testing – System volume does need not be loud to test
  • Easy-to-Understand Polarity LEDs – Green = Correct, Red = Incorrect
  • Built-In Low Battery Indicator LED
  • Includes USB Thumb Drive with Polarity Pulses and Pink Noise
  • Comes with a Protective Storage Case, Quick Start Guide and Insulated Test Leads
  • Uses a Standard 9V Battery (Not Included)



  • Test polarity of audio system speakers before starting an installation or tuning

  • Generate pulses into the audio system to verify speaker location and polarity

  • Test polarity of OEM audio signals at the source unit or amplifier output (up to 4V)

  • Identify speaker location and polarity in OEM audio systems using internal pulse generator

  • Verify polarity shift in active or passive crossovers (especially 12dB/octave applications)

  • Optimize subwoofer polarity to blend with other system speakers for “up front” bass


Technical Specifications:

  • Output Pulse Voltage (RCA Jack) 0.05VAC RMS

  • Output Pulse Voltage (Speaker Jacks) 1.5VAC RMS

  • Output Pulse Duration (RCA or Speaker Jacks) 70mS (0.07 Second)

  • Max Input Voltage (Speaker Jacks) 4V

  • Speaker Jack Spacing 0.59” / 15mm

  • Test Probe Leads for Speaker Jacks 4mm Banana w/Silicone Wire

  • Power 9V Battery (not included)

  • Weight (including battery, case & probes) 10.8oz / 305g


For the test tracks and "How to" please visit our downloads page HERE.

PT-9A+ Kit


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