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Audio Calculators

by John Siau June 04, 2023

Benchmark AHB2 Power Amplifier

Distortion measurements (THD, THD+N and IMD) are traditionally expressed in terms of percent. But what do 1%, 0.1%, 0.01% or 0.001% mean in terms of loudness or audibility?

If you are like most people you just know that 0.001% is the best of the three numbers listed above. If you are a well-trained geek you will recognize that each added leading zero represents a 20 dB improvement. 0.01% is 20 dB lower than 0.1% and this is 20 dB lower than 1%. The well-trained geek will convert % to dB in order to give meaning to these numbers.

When distortion reaches 1% it is just 40 dB lower than the music. When distortion reaches 0.1% it is 60 dB lower than the music. When distortion reaches 0.01% it is 80 dB lower than the music. Obviously the 40 dB, 60 dB and 80 dB figures are easier to understand than 1%, 0.1% and 0.01%.

Read more here:

Interpreting THD Measurements - Think dB not Percent!

 

THD % to dB Converter

Results update on input change.

Results

THD dB to % Converter

Results update on input change.

Results

 

Find more audio calculators here:

Audio Calculators


Also in Audio Application Notes

Closeup of Plasma Tweeter

Making Sound with Plasma - Hill Plasmatronics Tweeter

by John Siau June 06, 2023

At the 2023 AXPONA show in Chicago, I had the opportunity to see and hear the Hill Plasmatronics tweeter. I also had the great pleasure of meeting Dr. Alan Hill, the physicist who invented this unique device.

The plasma driver has no moving parts and no diaphragm. Sound is emitted directly from the thermal expansion and contraction of an electrically sustained plasma. The plasma is generated within a stream of helium gas. In the demonstration, there was a large helium tank on the floor with a sufficient supply for several hours of listening.

Hill Plasmatronics Tweeter Demonstration - AXPONA 2023

While a tank of helium, tubing, high voltage power supplies, and the smell of smoke may not be appropriate for every living room, this was absolutely the best thing I experienced at the show!

- John Siau

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Benchmark AHB2 Power Amplifier

System Performance Calculations

by John Siau June 03, 2023

If an audio system is composed of multiple components, we may have detailed specifications for each component, but we will not know the performance of the combined system without doing some calculations. You may have questions such as these:

  • Will my audio system produce audible noise?
  • Will my audio system produce audible distortion?
  • How will my audio components work together as a system?
  • How loud will my audio system play?

Use Benchmark's online audio calculators to find answers!

For example, if we know the output power of an amplifier, as well as the sensitivity and impedance of our loudspeakers, we can calculate the maximum sound pressure level that our system can produce.

Peak SPL Calculator

Results update on input change.

Results

This application note provides interactive examples that help to answer the questions listed above.

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ChatGPT Logo

ChatGPT and John Siau Discuss Star-Quad Cables

by John Siau May 30, 2023

Today, Benchmark's John Siau and OpenAI's ChatGPT had a conversation about star-quad cables. It turns out that ChatGPT got quite a few things wrong, but learned quickly when these errors were pointed out by John Siau.

ChatGPT is quick to recognize mistakes, and quick to provide detailed corrections. In each of the first few corrections, additional errors were made. As each of these were pointed out, ChatGPT began to provide accurate information.

Here is my conversation with ChatGPT: 

John Siau PFP

John Siau:

How do star-quad cables reject interference?

ChatGPT logo

ChatGPT:

Star-quad cables are designed to provide improved rejection of ...

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