LF Audio was founded in 2023 in Fullerton, California by Marius Dornean, a Google Engineering Manager who also created LoudFiat—the world's first 400V electric vehicle SPL system. Unlike typical car audio brands, LF Audio specializes in precision-engineered monitoring and control systems: wireless bass knobs (WVC-PRO), high-precision voltmeters (HPVM-PRO), and data telemetry products using proprietary AuralSync mesh technology. All products are engineered, assembled, and individually tested in Southern California. With an A+ BBB rating and recent expansion of US manufacturing capabilities, LF Audio fills a niche for professional-grade basshead instrumentation.
HPVM Pro Voltage Meter Precision volt meter for automotive and car audio 2-inch LCD with 65,000 colors Monitors four sources simultaneously Measures up to 18 volts Customizable display with ten gauge faces Bluetooth-enabled connection with free AuralSync app Your Style. Our Precision. Able to monitor four sources at once, the HPVM Pro is the most versatile graphing voltmeter available today, accurate to 2/1000 of a volt. The HPVM comes equipped with Bluetooth connectivity, allowing it to connect to thefree Aural Sync™ app, optional AuralSync Companion Smartwatch, and otherAuralSync-enabled devices. Use the app to choose any one of ten gauge designs, thencreate user-definable voltage ranges and custom colors to make each look match your needs, and your style The HPVM also features wiring terminals on the back and bottom of the unit foradditional mounting options, and a clean look. Overbuilt To Last Extremes in vibration, humidity, and temperatures are always attacking everything inyour vehicle. A solid aluminum case houses high-density/temperature internal supports,and gold-plated ENIG PCB to survive – and thrive – in any build. Advanced Power Management The HPVM’s innovative Deep Sleep mode is engineered to minimize powerconsumption, drawing just 167 milliwatts when it senses a gradual voltage drop withouttransients. This ensures minimal battery drain, taking up to 294 days to deplete a fullycharged 100 amp-hour 12V AGM battery. While in low-power mode, the HPVM Pro continuously monitors cumulative batterydrain. A prominent red warning signal is triggered by significant voltage drops, flaggingpotential issues such as excessive parasitic loads or a failing battery. This intelligentdesign ensures early detection of power system issues, identifying issues like a weakbattery or excessive parasitic draw, before they become bigger problems. The system’s rapid response circuitry also ensures immediate reactivation upondetecting a voltage spike, seamlessly resuming full operation, and offering real-timeupdates to keep you informed. For instructions on connecting your HPVM, updating firmware, using the app, and more, please see our getting started page. Features Supply Voltage 3v-18v Individual Voltage Monitoring Points 4 Voltage Measurement Range 1v-18v Accuracy 99.99% accurate (+/- 0.002v) Precision 1mV - 3 decimal places (e.g. 15.234v) Sample Rate 330 samples per second per channel Display 2.0" diagonal TFT HD IPS LCD - 240x320 pixels / 65k color Visual Refresh rate 33 FPS Settings Use our LF Audio AuralSync™ smartphone app or AuralSync Companion smartwatch to change settings on the unit. Over The Air (OTA) firmware updates Use our LF Audio AuralSync™ smartphone app to check for and apply firmware updates Physical Info Size 71mm wide x 61mm deep x 25mm tall Weight 3.0 oz Getting started / wiring instructions Certifications