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Cardas Irrational but Efficacious Test CD

2 Reviews


This CD is designed to enhance the enjoyment of listening to your audio system.

The main tool is track seven, a five minute glide-tone, that when played through your system at a moderately low listening level, will improve the overall sound presentation of your system.

While we don't have all the technical details of the science involved here at Needle Doctor, we suspect it functions by demagnetizing residual fields that build up in your components over time. We recommend playing this track on a regular basis, anywhere from every two weeks to once a month.

Ratings & Reviews

2 reviews

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Ed Wong


This CD is amazing. Audio quality in any two channel or home theatre system is totally upgraded. Absolutely recommended.



I can't explain it, but it works and I am a no-nonsense, DIY engineer. No snake oil here.