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CANFORD LEVEL LIMITED HEADPHONESCanford has considerable experience in the design of headphone limiters and their use in the operational environment. Whilst virtually any headphone or headset can have a limiter fitted, using one of the seven types of standard multipurpose limiter circuits, this usually has to be in an in-line housing. By designing type-specific circuits for individual ear loudspeakers, these can be made small enough and appropriately shaped to enable them to be built into the earcup housing. Adding a limiter circuit to a headphone alters the input impedance.For level limited headsets, see CANFORD LEVEL LIMITED HEADSETS.Sennheiser HD480The Sennheiser HD480 type headphone is an open back type headphone with 1700 ohm capsules. In order to distinguish these headphones from standard non-protected versions, they are distinctively marked on the ear shell. Limiting level is fixed at 93dBA Standard connector options are available, and because the limiter is within the capsule, it is possible to use spare or replacement leads, as for standard versions.All types have interwoven copper/Kevlar cables for extra strength. As with in-line limiters, each headphone is individually calibrated, and as each capsule has its own individually calibrated limiter, spare limited capsules are available.Single-sided cables connect to the left earpiece, with a loop over the headband to the right earpiece; a fixing kit is supplied to hold the cable onto the headband. Note that in these versions, the earpieces are mounted onto the headband the opposite way up (connector at the top)
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