The Top Rated Portable Noise Canceling Headphones of 2011

The Best Portable Noise Canceling Headphones

The noise canceling headphones are different from "noise isolating" or "passive noise reduction" headphones. Noise canceling headphones feature tiny microphones to pick up outside frequencies and then counter those frequencies to cancel them out. The following list of top rated portable noise canceling headphones was chosen based on reviews from Consumer Reports, CNET, HeadphoneInfo.com, iLounge, PCMag, and Amazon customers. Bose QuietComfort 15 Noise Canceling Headphones ($300) Top … [Read more...]

Review: Digital Stethoscope by ThinkLabs

Digital Stethoscope

I've been testing this Digital Stethoscope by Thinklabs. Unlike most digital stethoscope, this one has an audio out port, which allows you to connect it to a computer or MP3 recording device. … [Read more...]

The Best Rated Outdoor Speakers

Polk Audio Atrium 45 Outdoor Speakers

When warm evenings beckon you outdoors, who says you need to leave your music in the house? Outdoor speakers let you bring your sounds with you, and you can enjoy high-quality audio with the convenience of a built-in system. We present here the four of the top rated directional outdoor speakers on the market. These outdoor speakers are best suited for maximizing sound quality in a defined space, such as a porch or patio. Most can be easily mounted on an exterior wall under an eave or … [Read more...]

Below 20 Hertz: The Rumbling Realm Of Infrasound

Artwork by Andy Gilmore

Infrasound is the realm of sounds in the frequency range of 20 Hz down to 0.001 Hz. According to Harry F. Olson in his book Maths, Physics and Engineering: 20 Hz is considered the normal low frequency limit of human hearing. The lower the frequency of sound, the more difficult it us for human to hear it. So, in order for us to hear a sound under 20 Hz, it must be powerful. We mostly hear infrasound through our ears, but at higher levels it is possible to feel infrasound vibrations in … [Read more...]