versions to maintain the integrity of the technical signals. Ensure your playback software does not apply any "normalization" or EQ, as these signals are designed to be played exactly as recorded to avoid clipping your amplifier. If you'd like, I can: calculate the estimated burn-in time needed for your specific speaker brand. Explain the physics of speaker "break-in" and why some engineers debate its necessity. Provide a checklist for safe system setup before you start the CD. How would you like to proceed with your audio tuning? Magic CD - JMR Electroacoustique - jm-reynaud.com
Track 11 (covers the entire audible spectrum, 20Hz-20kHz).
These tracks utilize narrow-band random noise, all centered on a very low frequency of 22Hz. The bandwidth of this noise expands across the five tracks: 10Hz, 31.6Hz, 100Hz, 316Hz, and finally 1000Hz. This section is specifically engineered for the "woofer suspension system". A crucial point is in Track 1 at the 2 minute and 16-second mark: this is the loudest bass pulse on the entire disc, and it's the reference point for setting your system's volume.
(316 Hz bandwidth) – Midrange and vocal frequency exercising. Using the Magic CD in FLAC/Digital Format
Begin playback and slowly increase the volume. As you do, carefully watch the motion of the woofer cones on your speakers. The goal is to reach a point where the cone is moving vigorously but without making a mechanical "bottoming out" or slapping sound (known as "clipping" or "bottoming"). The loudest bass pulse at 2:16 in Track 1 is your key reference point for setting the maximum safe volume. Magic Cd Jean Marie Reynaud Flac
For audiophiles, the journey toward sonic perfection is rarely complete. Loudspeakers and high-fidelity electronics require a "break-in" period—a time for mechanical parts, specifically speaker suspensions, to soften and reach their optimal operating performance.
The Magic CD works by sending a carefully engineered, narrow-band, random noise signal to the speakers. This signal, created via a series of modulators and filters, ensures the speaker drivers—particularly the woofer and tweeter suspensions—work across their entire range of motion, from 2 Hz up to 200 kHz.
Never play the JMR Magic CD at high volume levels. Begin with your amplifier volume at zero. Gradually increase the amplitude until you can see or feel the bass cones vibrating smoothly. The signal should be audible but low enough that you can easily speak over it without raising your voice. 3. Execution Cycles
When you play the FLAC, focus on these 4 attributes. If they’re missing, your system needs work. versions to maintain the integrity of the technical signals
: High-mid signal (centered at 1500 Hz) specifically for crossover components. Tracks 9–10
Once the volume is set correctly, you can let the disc play through. For thorough results, many suggest playing it ten times or more over several days. Some retailers even run it on a loop overnight at a low volume to gently break in speakers for their showrooms.
Play Track 1 and slowly increase the volume. Watch your woofer cones. They should move smoothly and visibly, but they must never make an audible "clacking" sound or reach their physical limits.
❌ — LDAC or aptX HD still degrades phase coherence. Wired only. ❌ Windows mixing with DirectSound — Enable WASAPI or ASIO. ❌ FLAC > Bluetooth speaker — pointless; just play MP3. ❌ Upsampling on the fly — Let the DAC handle it, or use a proper offline upsampler (PGGB, HQPlayer) only if you have a high-end DAC. Explain the physics of speaker "break-in" and why
Now, to address the crucial part of your search: .
Once the level is safe for Track 1, do not touch the volume for the remaining tracks.
Reynaud developed the Magic CD to compress this timeline drastically while ensuring the mechanical parts loosen up evenly and safely. How the Magic CD Works: The Science Behind the Signals