Quick Answer: The Rubens Tube, 2m Pro With Amplifier is a 2 m tube for a visual demonstration of standing waves, with a built-in amplifier that lets phones, tablets and other signal sources drive it.
Last updated: October 2026
Key Features
2 m tube length
Built-in 7W mono amplifier with 40 mV input sensitivity
20W, 8 Ω speaker
Gas supply: natural gas or propane, 40 millibar maximum
Power supply 15V 0.5A dc
Technical Specifications
Specification
Value
Length
2 m
Speaker
20W, 8 Ω
Amplifier
7W mono
Input sensitivity
40 mV
Power supply
15V 0.5A dc
Gas supply
Natural gas or propane (40 millibar max)
About This Product
The tube gives a very visual demonstration of the concept of a standing wave, and measurements taken from it make it possible to calculate the speed of sound. Its built-in amplifier means it can be driven by a wide range of signal sources, including phones and tablets.
Frequently Asked Questions
Q1. Which signal sources can drive the Rubens tube? The built-in amplifier allows it to be driven by a wide range of signal sources, including phones and tablets.
Q2. What gas supply does it use? Natural gas or propane, at a maximum of 40 millibar.
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