Shure SRH1440 Open Back Headphones Fuzz It gives 12 volt AC

It gives 12 volt AC - among other things

The release circuit is a unique 3 stage circuit that auto releases the faster signals at a rate of 10 times the release of the lower frequency signals

while the KELLYberg® is patterned after the Conn-Helleberg® series

FORM FACTOR - 2 CHANNELS

Shure SRH1440 Open Back Headphones Fuzz It gives 12 volt ACShure SRH1440 Open Back Headphones The SRH1440 Professional Open Back Stereo Headphones from Shure provide clear, full range audio in a sleek and stylish design. The headphones have 40mm neodymium drivers to provide clear, realistic audio with rich, controlled bass. The open back earcup design promotes proper airflow, which results in natural audio with a wide stereo image and excellent depth. The headphones have a fully adjustable padded steel frame