CANFORD LEVEL LIMITED HEADPHONES HD480 88dBA, wired split-feed, Ntk B-gauge plug, s/s coiled cable

Sennheiser (HD480, HD25, HD280 PRO)

HD480

The 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 85dBA (green trim ring), 88dBA (red trim ring) or 93dBA (grey or blue trim ring) (note 1). 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).

Frequency response: 20-20000Hz. Input impedance: 1200 ohms per earpiece. Sensitivity: 91dB for 1mW. Weight: 140g

HD25

Closed ear designs with extremely high external noise attenuation. Flip-away earcups, can be locked securely in place. High wearing comfort due to a splittable headband and leather-effect earpads. Single-sided, coiled 1.5m cable (3m extended), steel cored for reliability, supplied fitted with a straight 3.5mm 3-pole jack plus adapter to 6.35mm A-gauge 3-pole jack plug.

Impedance 70 ohms. Frequency response 16-22000 Hz, 200mW load rating.

Limited spare cables

HD280 PRO

Closed back circumaural headphones with high noise attenuation. Folding and rotating ear cups have been integrated on this updated version for easier transportation. Single-sided coiled cable with 3.5mm 3-pole jack, plus screw-on adapter to 6.35mm jack. Frequency response 8 to 25000Hz. SPL 113dB. Weight 285g. Nominal impedance 64 ohms. Supplied limited at 88dBA.

Beyerdynamic (DT100, DT250, DT770-Pro)

DT100

The closed back DT100 headphones have 400 ohm capsules. Units are available in the black shell version, with distinctive marking to distinguish them from standard non-protected versions. Limiting level is fixed at 93dBA (note 1). As with in-line limiters, each headphone is individually calibrated. Standard connector options are available, and because the limiter is within the earshell, it is possible to use spare or replacement leads, as for standard versions. Due to the method of construction, it is not possible for replacement ear loudspeakers to be user-fitted in these types, units requiring repair must be returned to Canford. For the same reason, replacement limited ear loudspeaker units are not available as spare parts.

The DT100 level-limited headphones are available as standard in five versions - four terminated and one without cable:

DT250

A professional monitoring headphone with great comfort for extended wearing. Supplied with 2.5m coiled cable, 3.5mm jack plug with 6.35mm adapter, or with Neutrik NC7MXX.

DT770-Pro

Closed ear design, available with 80 or 250 ohm impedance, incorporating Beyerdynamic’s bass reflex system, combines articulate low end response with a lightweight diaphragm. Frequency response equalised to the diffuse sound field. Fitted with 3.5mm jack with 6.35mm adapter.

Canford (DMH205, DMH620)

DMH205

Heavy duty ‘closed ear’ general purpose headphones. Very robust construction, hidden fixings hinder tampering whilst allowing easy repairs. 2 metre cable with steel conductors, fitted with robust Neutrik 3 pole A-gauge, B-gauge plug or Canare 3.5mm plug. Impedance 2 x 400 ohms.

DMH620

Lightweight, 'closed ear' general purpose 32 ohm headphones. Adjustable elastic headband and swivel earcups. Single-sided, 1.5 metre coiled cable, fitted with 3.5mm jack plug. Supplied limited at 88dBA. Spare parts available.

Sony (MDR-7506)

MDR-7506

Rugged closed ear design and wide frequency response for reliability and accuracy (note 2). 3 metre coiled OFC cable, fitted with gold 3.5mm 3-pole mini jack with 6.35mm 3-pole jack adapter.

Shure (SRH440, SRH840)

SRH440

Closed-back, circumaural headphones designed for recording and programme monitoring, with 3 metre coiled cable. Available wired stereo with 3.5mm plug and 6.35mm A-gauge adapter or Neutrik B-gauge plug with black cover.

SRH840

Closed-back, circumaural headphones designed for recording and programme monitoring, with 3 metre coiled cable. Available wired stereo with 3.5mm plug and 6.35mm A-gauge adapter