Cardas Audio Frequency Sweep and Burn-In Record Mk II LP

Sweeps, Polarity Checks and a Degaussing Track, Mastered at 16 2/3 RPM

The Cardas Frequency Sweep and Burn-In Record Mk II is a working tool rather than a demonstration disc. George Cardas produced it and Stan Ricker mastered it, and it carries standard tones, polarity checks, channel identification and a set of sweeps that clean and degauss as they play.

Two things accumulate quietly in a system: magnetic charge in the cartridge and signal path, and debris on the stylus. Both arrive slowly enough that nobody notices them arriving, and a sweep disc deals with both in the time it takes to play one side.

Accuracy, Range and Fit

What Is On the Disc and What It Is Cut To

The record carries frequency sweeps, relative and absolute polarity checks, vocal channel identification, locked pink noise grooves that repeat endlessly, blank plateaus, and a sync label for checking platter speed. It is pressed on 180-gram vinyl.

The sweep track known as The Sweeper is mastered at 16 2/3 RPM and played at 33 1/3, which doubles every frequency on replay. That is how a disc cut at ordinary speeds reaches ultrasonic territory — the range that does the cleaning and degaussing work.

Locked grooves are the other design decision worth knowing about. A pink noise groove that repeats endlessly will run while you walk the room, which is how a standing wave gets found rather than guessed at.

What Reviewers Are Saying

Stereophile lists the Cardas Frequency Sweep and Burn-In Record in its Recommended Components, which for a setup tool rather than a component is unusual company to keep.

Who Is the Cardas Sweep Record Best For?

• Your system sits unused for stretches — the sweeps degauss the signal path and clean the stylus in one side
• You want to check polarity properly — both relative and absolute, which most test discs skip
• You are treating a room — the locked pink noise grooves repeat indefinitely while you walk around
• You want platter speed checked too — there is a sync label on the disc for it
• You want detailed alignment test tones — this disc is built around sweeps and system checks; a dedicated setup LP from test records goes further there

How Do You Use It?

Clean the stylus, then play the sweep tracks at normal listening level — not loud. Run the polarity and channel checks next and correct anything you find before going further. Leave the locked pink noise groove running while you walk the room. Use the sync label with a strobe to confirm platter speed.

Pairs Well With

What most test-record owners shop next.

• Stylus force gauges — a test record shows the problem; a gauge is how you fix half of it
• Cartridge alignment tools — the other half, and the one a test disc will expose
• Record cleaning solutions — test signals are only as clean as the groove carrying them
• Stylus cleaning — do this before you trust anything a test record tells you

Frequently Asked Questions

How accurate is it?

It is mastered by Stan Ricker and pressed on 180-gram vinyl, with the sweep track cut at 16 2/3 RPM so that playing at 33 1/3 doubles the frequencies. The tones are standard references rather than approximations.

What does the degaussing actually do?

The ultrasonic content of the sweeps demagnetizes the cartridge and signal path, and shakes debris off the stylus at the same time. Cardas recommends it as periodic maintenance rather than a one-off.

Will it work with my system?

Any turntable and cartridge. Play the sweeps at a normal listening level; there is no need — and no benefit — in running them loud.

What are the blank plateaus for?

They present the stylus with a groove and no signal, so what remains is your system's own noise floor. That is a different measurement from simply lifting the arm.

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