Assessor Guidelines

Welcome, Audio Explorer! Your MUSHRA Test Guide

Welcome, Audio Explorer!

You’ve been selected for your keen sense of hearing. This guide will prepare you for your mission: to be an expert listener.

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Your Mission, Should You Choose to Accept It…

You are an audio detective. In each trial, you will hear a perfect, original audio track called the Pristine Copy. You’ll also hear several other numbered Samples. Your job is to listen carefully and rate how similar each sample is to the Pristine Copy on a scale from 0 to 100.

The Key Players in Your Test

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The Pristine Copy

This is the gold standard. The original, untouched, perfect-quality audio. All your comparisons will be made against this track.

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The Samples (1, 2, 3…)

These are the tracks you need to rate, selectable from a list. Some might sound identical to the Pristine Copy, others might have differences.

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The Hidden Pristine Copy

Here’s a fun challenge! One of the numbered samples is identical to the Pristine Copy. Find it and confidently set its slider to 100.

How to Score Like a Pro

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Use the Interface Controls

Your test screen shows a list of samples, a player with a waveform, and sliders for each sample. Click a sample to play it and use its dedicated slider to set your score.

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A/B Compare is Your Best Friend

The best way to spot differences is to switch back and forth quickly between the Pristine Copy and a Sample. Your brain is excellent at detecting changes this way.

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Listen for ANY Difference

Rate based on any artifact you hear. If it sounds different from the Pristine Copyโ€”muffled, distorted, tinny, etc.โ€”that’s what you score.

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Trust Your Ears!

There are no right or wrong answers, only your perception. Listen, decide, and score confidently. Your unique input is incredibly valuable.

What Do the Numbers Mean?

Think of the 0-100 scale on your sliders like this. It helps to have these quality levels in mind as you are assigning scores.

A Typical Test Trial: Step-by-Step

1. Select the ‘Pristine Copy’
Find and play the ‘Pristine Copy’ from your list. Listen carefullyโ€”this is your perfect version.
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2. Audition all Samples
Click through the other numbered samples to get a general idea of the quality range in this trial.
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3. Find the Hidden Pristine Copy
Hunt for the sample that is identical to the Pristine Copy. A/B test it to be sure and set its slider to 100.
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4. Compare and Rate with Sliders
For every other sample, switch between it and the Pristine Copy. Use the dedicated quality slider for each one to lock in your score.
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5. Final Review & Submit
Give all your slider positions one last look, make any final adjustments, and submit your ratings.

Thank you for your valuable contribution to audio research!