APM-X Wireless SPL Meter

APM-X Wireless SPL Meter


APM-X Wireless SPL Meter

$419.99 Sale price
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The SSA Accuwave Pressure Monitor X (APM-X) is a highly accurate, very user friendly, affordable SPL meter that anyone with a Bluetooth connected Android, or Apple device (see requirments below) can use. Simply start the app on your device, connect to the APM-X via Bluetooth, and crank up your car stereo. The APM-X is the perfect choice for people who are doing testing & tuning, or hosting their own SPL competition, or just want to find out how loud they can go. The SSA Studio app is free as well as updates are free with No wires or software to install on your laptop. Just place the APM-X inside the vehicle and turn it on, connect it via Bluetooth and go to it.



  • Rechargeable battery with up to 7h battery life
  • USB-C reversible connector
  • Bluetooth 4.0 connectivity
  • Multiple sensors can be connected to the app
  • Two clients can connect to one sensor at the same time
  • Graphical OLED screen
  • Auto-shutdown after period of inactivity
  • Screen auto-rotation
  • Individually calibrated to <0.01dB error over the entire operating temperature range, with calibration reports for each sensor
  • Tamper-proof calibration tables and firmware
  • Sensor spoof protection
  • Improved connectivity compatibility
  • Less than half the size of the previous version
  • Secure Over the Air updates for future improvements and features
  • Separate digital and analog power supply circuitry for low noise operation


  • Frequency range: 5-100 Hz
  • Frequency precision: 1 Hz
  • Measurement report rate: 2 Hz
  • Amplitude range: 100 dB - 177 dB
  • ADC Resolution: 24bit
  • Battery capacity: 500mAh
  • Battery charge time: ~2.5h,
  • Battery life with BT connected: ~6h, with BT off/Power Saving: ~10h
  • Bluetooth range: ~10m
  • Power supply: 5V 500mA USB-C reversible connector
  • 12V Adapter: Dual 2.1A USB supply, with 12V and 5V voltmeter and USB current monitor
  • Display: 0.66” Monochrome Graphical OLED
  • Operating temperature: 0-60C
  • Weight: 75 grams
  • Sensor dimensions: 48.6mm x 15.5mm x 93.6mm (without suction cups)

Customer Reviews

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Customer Testimonials


Its 100% the  best place I’ve shopped for my car audio needs big and small always take my calls answer any questions I may have and your quick shipping is absolutely the best!

I rate the value of my purchases a 5! 

Michael Varela

Low Hertz is a lot more than a website. I know I could reach out to them if I needed anything.
No, not just with products. You can always count on quality. But questions about the hobby. Low Hertz is a movement in Car Audio. Where your not judged but helped! So get in the movement with us.
#RepTheMovement #LHCA

Ben Davis

Awesome place. Awesome customer service. Great people and always answer questions and get orders together. Great shipping time. Highly recommended. #1 spot for great service

Nick Brownell

I've been ordering from Low Hertz past few weeks now, I tell you these guys are on point! Fast shipping and the best part is... No Tax! I am a loyal customer and If you don't have the customer service like these guys, then your cut off. I will definitely get more stuff from Team Low Hertz! Thanks again for your hard work!

Johnson Thammavong

Man these guys go above and beyond. the customer service is off the charts.. #LHCA is the way to go.. I love my #LHCA bass knob, and you bet imma rock that #LHCA swag everywhere I go...

David Ebel II

The customer service is world-class!  Zack and his team were super responsive and went out of their way to research and come up with some creative solutions!  The product selection, prices and shipping are some of the best you’ll find anywhere online.  Plus the fitment and ease-of-installation of their products are excellent.

Casey McGehee

The last 3 box designs I've purchase were all 150+ db certified in the lanes, your results may vary depending on vehicle and power but they definitely know what they're doing. Well worth the money !

Eric Feliciano

They designed my husbands box. Came out great. Never a disappointment when it comes to these guys. Definitely will be coming back for another build!

Katie Belluno
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