Tenma 72-850 Speaker Measurement Interface Installation and Use Manual

About this manual

The Tenma Speaker Measurement Interface is a USB‑powered device used to measure Thiele‑Small parameters of loudspeaker drivers. It supplies a test lead and a line‑out for driving an amplifier, and the accompanying software converts the measured impedance and phase data into useful driver specifications.

The manual covers software installation on supported Windows versions, hardware connection procedures, recommended test‑bench setups, calibration options, menu functions, and advanced topics such as test‑lead inductance measurement and definition of acoustic parameters.

What's inside

• Software Installation
• Hardware Connections
• Making a Test Bench
• Pulldown Menus
• Thiele Small Data and Control
• Adjusting CalR value
• Measuring Test Lead Inductance
• Definitions

Specifications

Frequently asked questions

Which Windows operating systems are supported by the Tenma Speaker Measurement Interface?

The device works with Windows 98 Second Edition (with USB service packs), Windows ME, Windows 2000, and Windows XP. Earlier versions such as Windows 95 and pre‑Win98SE are not supported.

How do I change the default sound output back to my original sound card after installing the interface?

Open Control Panel → Sounds and Audio Devices → Audio tab, then in both the Sound Recording and Sound Playback sections select your original sound card from the Default device list.

What are the power requirements for the Tenma Speaker Measurement Interface?

It draws only a few milli‑amps from the USB port and does not need an external power supply.