Stereo Ear
The History of High Fidelity Stereo In-ear Earphone
The High Fidelity Stereo In-ear Earphone such as the one pictured at the right was common at the beginning of the 20th century. Headphones originated from the earpiece, and were the only way to listen to audio signals before amplifiers were developed. The first truly successful set was developed by Nathaniel Baldwin, who made them by hand in his kitchen and sold them to the U.S. Navy.
Very sensitive headphones such as those manufactured by Brandes around 1919 were commonly used for early radio work. These early
High Fidelity Stereo In-ear Earphone
used moving iron drivers, either single ended or balanced armature. The requirement for high sensitivity meant no damping was used, thus the sound quality was crude. They also had very poor comfort compared to modern types, usually having no padding and too often having excessive clamping force to the head. Their impedance varied; headphones used in telegraph and telephone work had an impedance of 75 ohms. Those used with early wireless radio had to be more sensitive and were made with more turns of finer wire; impedance of 1,000 to 2,000 ohms was common, which suited both crystal sets and triode receivers.
In early powered radios, the headphone was part of the vacuum tube’s plate circuit and had dangerous voltages on it. It was normally connected directly to the positive high voltage battery terminal, and the other battery terminal was securely earthed. The use of bare electrical connections meant that users could be shocked if they touched the bare headphone connections while adjusting an uncomfortable headset.
Turtle Beach Ear Force® X12 Amplified, Stereo XBOX Gaming Headset
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Pillowsonic Stereo Pillow Speaker $17.39 The Pillowsonic features quality speakers that deliver crystal-clear sounds at gentle, safe volume levels. Resonating throughout even the plushest pillows, the audio is of excellent quality — encompassing the entire surface, allowing you to turn freely without missing a beat. Our speakers are so slim that you’d never know there is a powerful innovation under your pillow — except for the sounds t… |
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Bias Peak Studio $488.00 Don’t mess around with just any mastering software. Get a total suite that sounds awesome! Peak Studio from BIAS is your complete mastering package, loaded with tools you need to edit, master, and deliver your music on a Mac. It includes Peak Pro 7, a new SoundSaver plug-in that helps you with archiving, and you also get a bunch of effects and even cool third-party virtual instruments. The bottom … |
