Puro Sound Labs PuroPro ANC wireless headphone review

I’ve long advocated for protecting your hearing by limiting the levels you listen to. Long-term exposure to high sound pressure levels leads to noise-induced hearing loss (NIHL), which can greatly reduce your sensitivity to high frequencies and midrange frequencies that are fundamental to understanding speech. Another potential symptom is the constant annoyance of tinnitus (aka ringing in the ears), which can become permanent—and there’s no cure.

Puro Sound Labs addressed this concern with its PuroQuiet headphone, reviewed here, which is designed for children and limits its output level to protect them from NIHL. Now, the company has introduced an adult version of the same idea. The PuroPro purports to limit the sound pressure level reaching your ears while providing hybrid active noise cancellation, Bluetooth connection to your source device, and excellent sound quality. It’s remarkably successful in achieving these goals, with one minor caveat.

This review is part of TechHive’s coverage of the best headphones, where you’ll find reviews of competing products, plus a buyer’s guide to the features you should consider when shopping for this type of product.

Features

The PuroPro is a lightweight, over-ear headphone made mostly of plastic with protein-leather-clad earpads and adjustable headband. The earcups fold into a compact form that fits in the included travel case.

Puro Sound Labs

The PuroPro folds into a compact shape that fits in the small included carrying case.

Interestingly, the PuroPro is shipped in a wood box. The wood is very light; it reminds me of the balsa wood used in the model airplanes I used to build as a kid. The company touts its “environmentally friendly packaging,” but I’m not sure how environmentally friendly this wood is compared with cardboard.

Mentioned in this article

Each earcup houses a 40mm full-range, custom-designed dynamic driver with a frequency response specified to extend from 20Hz to 20kHz with less than 1% THD. The rated power delivered to the drivers is 10mW, and the wired connection has an input impedance of 32 ohms. The company touts its Puro Balanced Response Curve (see Fig. 1), which is said to deliver clear, crisp vocals and full, dynamic bass within the volume limit imposed by the headphone.

Puro Sound Labs

The Puro Balanced Response Curve is based on Sean Olive's work at Harman investigating how to simulate the sound of speakers in a well-treated listening room on headphones.

Speaking of which, the PuroPro limits the sound pressure level of its output to help avoid—or at least reduce—noise-induced hearing loss. Unlike the PuroQuiet, you can select one of two limits: 85 or 95 dB SPL. The Occupational Safety and Health Administration (OSHA) specifies that workers can be exposed to an average of 85 dB SPL during an eight-hour day, while 95 dB SPL is safe for only 50 minutes. I guess Puro Sound Labs figured that adults can be responsible for...

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