Canford 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 headphones, see CANFORD LEVEL LIMITED HEADPHONES.
As DMH620 headphones but with 600 ohm dynamic mic. Single-sided, 1.5 metre straight cable, supplied unterminated, or with Neutrik XLR 4-Pin female or Neutrik XLR 5-Pin male. Supplied limited at 88dBA. Spare parts available. Cable colours: Blue - ear left positive; Green - ear right positive; Black - ear left and right negative; Red – mic positive; Bare – mic negative.
Beyerdynamic DT280 and DT290
Headsets with an extremely low visual profile for improved 'in-shot' appearance, and great comfort for extended wearing. Dual muff (DT290) or single muff (DT280), hypercardioid dynamic mic. 'XJ' suffix denotes supplied fitted with Neutrik NC3MX XLR 3-pin male for mic and NPC3C 3-pole A-gauge jack. 'XLR5M' suffix denotes supplied with Neutrik NC5MXX 5-pin male (mic pins 1 & 2, common pin 3, ear left pin 4, ear right pin 5).
As DT290 but with cardioid pattern condenser mic. Supplied fitted with Neutrik NC3MX XLR 3-pin male for mic and NPC3C 3-pole A-gauge jack. Also available with Neutrik NC7MXX connector.
The DT109 level-limited headsets are available in four versions - two terminated, one unterminated and one without cable (XLR wiring is compatible with Tecpro and RTS intercom systems, see Tecpro Communication System - Headsets product group for details of the wiring conventions):
Closed ear design optimised for interpreting applications. Type DT394.MCS is fitted with an 8-pin DIN connector for use with the Beyerdynamic MCS-D202 interpreter station.
The DT790 is a combination of the closed studio headphone DT770, the high-quality dynamic - hypercardioid microphone of the DT 290 with a new pivoting, gooseneck microphone boom.
As DT790 but with cardioid pattern condenser mic.
This lightweight headset features a dynamic, hyper-cardioid, 300ohm microphone with a response of 40Hz-16kHz. The closed-ear, supra-aural, headsets are designed for use in TV and radio broadcast applications, with high maximum SPL and high wearing comfort, in combination with a good noise attenuation and a frequency response of 20Hz-18kHz. The flexible gooseneck microphone boom, which can be used either on the left or right-hand side, is muted when the boom position is upright.
Sennheiser HMD 46-31 headsets have a dynamic microphone with noise compensation and a frequency response up to 12kHz. Designed for use in air traffic control applications, these lightweight headsets have high soft ear pads for high wearing comfort.
Closed ear design, these compact foldable headphones offer NoiseGardTM active cancellation, exceptional 50-hour battery life and an inline smart remote with mic for taking calls. Detachable single-sided, 1.4 metre straight cable, fitted with right-angled 3.5mm jack plug. Supplied limited at 85dBA. Impedance: Active 150 ohms/Passive 45 ohms. Frequency response 17 - 23000 Hz, In-line mic: dynamic closed.
Closed-back, circumaural stereo headphones have a 560 ohm, cardioid, dynamic microphone on a 180.1mm flexible gooseneck with a frequency range of 40Hz to 20kHz and is designed to pick up vocal sounds whilst reducing the pickup of unwanted background noise. Earpieces of the 65 ohms, frequency response of 20Hz to 20kHz. Detachable cable terminates with 3-pin male XLR (microphone) and 6.35mm, stereo jack (headphones) connection. Supplied limited at 88dBA.
1) The quoted limit level of 93dBA, 88dBA and 85dBA is for measurement using dummy head (or mannequin) systems. For measurements using flat plate calibrators the level will differ. Health and Safety authorities are more inclined to use the dummy head type measurement.
Certain ear loudspeakers and cables are listed as spares in a group. For further information, see CANFORD LEVEL LIMITED HEADPHONES AND HEADSETS Spare parts.