CANFORD LEVEL LIMITED HEADPHONES

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CANFORD LEVEL LIMITED HEADPHONES HD480 88dBA, wired stereo, with B-gauge plug

CANFORD LEVEL LIMITED HEADPHONES HD25 88dBA, coiled, 3 pole 3.5mm plug with 6.35mm adapter

SENNHEISER HD 280 PRO HEADPHONES 64 ohms

CANFORD LEVEL LIMITED HEADPHONES DT250 88dBA, wired stereo, coiled cable, 3.5mm/A-gauge plug

CANFORD LEVEL LIMITED HEADPHONES DT770-PRO 80 ohm, 88dBA, wired stereo, 3.5mm plug, 6.35mm adapter

CANFORD LEVEL LIMITED HEADPHONES DMH620 88dBA, wired stereo, 3.5mm plug, s/s coiled cable

CANFORD LEVEL LIMITED HEADPHONES MDR7506 88dBA, wired stereo, 3.5mm jack & 6.35mm adapter

CANFORD LEVEL LIMITED HEADPHONES SRH440 88dB, wired stereo, 3.5mm jack & 6.35mm adapter

CANFORD LEVEL LIMITED HEADPHONES SRH840 88dB, wired stereo, 3.5mm jack & 6.35mm adapter

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 headsets, see CANFORD LEVEL LIMITED HEADSETS.

Sennheiser

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

Code	Code	Code	Wiring	Cable type	Plug	Spare cable
85dBA	88dBA	93dBA
-	54-4010	-	-	-	No cable supplied	-
-	54-4011	54-305	Stereo	Dual-side	3.5mm 3-pole (stereo) plug	54-167
-	54-4012	54-304	Stereo	Dual-side	Neutrik 3-pole (stereo) A-gauge plug	54-044
-	54-4013	54-303	Stereo	Dual-side	Switchcraft B-gauge with black cover	54-043
-	54-4015	54-302	Split feed	Dual-side	Neutrik B-gauge with blue cover	54-042
-	54-4022	54-306	Stereo	Single-side	3.5mm 3-pole moulded plug with 6.35mm adapter	54-046
-	54-4024	54-315	Stereo	Single-side	4.4mm Bantam type jack moulded cover	-
54-4132	54-4032	-	Stereo	Single-side, coiled	3.5mm 3-pole moulded plug	54-036
54-4133	54-4033	54-311	Stereo	Single-side, coiled	Neutrik 3-pole (stereo) A-gauge plug	54-065
-	54-4034	54-312	Stereo	Single-side, coiled	Neutrik 3-pole (stereo), right-angled, A-gauge plug, black	-
54-4137	54-4037	-	Stereo	Single-side, coiled	Neutrik B-gauge with black cover	54-070
-	54-4036	54-314	Split feed	Single-side, coiled	Neutrik B-gauge with blue cover	54-039
-	54-4035	54-313	Split feed	Single-side, coiled	Switchcraft B-gauge with black cover	54-038

HD25

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.

Code	Code	Code	Wiring	Cable type	Plug	Spare cable
85dBA	88dBA	93dBA
-	54-4089	-	Stereo	Single-side, straight	3.5mm 3-pole moulded plug with 6.35mm adapter	-
-	54-4085	-	Stereo	Single-side, coiled	3.5mm 3-pole moulded plug with 6.35mm adapter	-
-	-	54-326	Stereo	Single-side, coiled	3.5mm 3-pole moulded plug with 6.35mm adapter	-

Limited spare cables

Code	Code	Code	Wiring	Cable type	Plug
85dBA	88dBA	93dBA
-	54-4097	54-328	Stereo	Single-side, straight	3.5mm 3-pole moulded plug with 6.35mm adapter	-
-	54-4096	54-327	Stereo	Single-side, coiled	3.5mm 3-pole moulded plug with 6.35mm adapter	-

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

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:

Code	Code	Code	Wiring	Cable type	Plug	Spare
85dBA	88dBA	93dBA				cable
-	-	54-330	-	-	No cable supplied	-
-	54-4071	54-336	Stereo	Single-side, straight	3.5mm 3-pole moulded plug with 6.35mm adapter	54-871
-	54-4072	54-334	Stereo	Single-side, straight	Neutrik stereo (A-gauge) plug	54-880
-	-	54-333	Stereo	Single-side, straight	Switchcraft B-gauge plug (black cover)	-
-	-	54-332	Split feed	Single-side, straight	Neutrik B-gauge with blue cover	54-878

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.

Code	Code	Code	Wiring	Cable type	Plug	Spare cable
85dBA	88dBA	93dBA
-	54-4067	-	Stereo	Single-side, coiled	3.5mm 3-pole moulded plug with 6.35mm adapter	54-7391
-	54-4121	-	Stereo	Single-side, coiled	Neutrik 7-Pin XLR male connector	54-7394

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.

Code	Code	Code	Impedance	Wiring	Cable type	Plug	Spare cable
85dBA	88dBA	93dBA
-	-	54-339	250 ohm	Stereo	Single-side, straight	3.5mm 3-pole moulded plug with 6.35mm adapter	54-7398
-	54-4061	-	250 ohm	Stereo	Single-side, straight	3.5mm 3-pole moulded plug with 6.35mm adapter	54-7398
-	54-4060	-	250 ohm	Stereo	Single-side, straight	Neutrik 5-Pin XLR male, right-angled connector	-
-	54-4075	-	80 ohm	Stereo	Single-side, straight	3.5mm 3-pole moulded plug with 6.35mm adapter	54-7398

Canford

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.

Code	Code	Code	Wiring	Cable type	Plug	Spare cable
85dBA	88dBA	93dBA
-	54-4040	-	Stereo	Single-side, straight	3.5mm 3-pole Nickel jack plug	-
-	54-4041	-	Stereo	Single-side, straight	Neutrik stereo (A-gauge) plug	-
-	54-4042	-	Stereo	Single-side, straight	Neutrik B-gauge plug (black cover)	-
-	-	54-209	Stereo	Single-side, straight	Neutrik stereo (A-gauge) plug	-

DMH620

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

MDR7506

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.

Code	Code	Code	Wiring	Cable type	Plug	Spare cable
85dBA	88dBA	93dBA
-	54-4051	-	Stereo	Single-side, coiled	3.5mm 3-pole moulded plug with 6.35mm adapter	54-4671
-	-	54-437	Stereo	Single-side, coiled	3.5mm 3-pole moulded plug with 6.35mm adapter	54-4671

Shure

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.

Code	Code	Code	Wiring	Cable type	Plug	Spare cable
85dBA	88dBA	93dBA
-	54-4055	-	Stereo	Single-side, coiled	3.5mm 3-pole moulded plug with 6.35mm adapter	54-566
-	54-4056	-	Stereo	Single-side, coiled	Neutrik B-gauge plug (black cover)	-
-	54-4057	-	Split feed	Single-side, coiled	Neutrik B-gauge plug (blue cover)	-

SRH840

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

Notes:-

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.
2) Due to the enclosed circuitry, the sensitivity and presented impedance of these headphones is different from standard versions.

Spares

Certain ear loudspeakers and cables are listed as spares in a group. For further information, see CANFORD LEVEL LIMITED HEADPHONES AND HEADSETS Spare parts.

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