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LEVEL LIMITED HEADPHONES AND HEADSETS

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.

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. Limiting level is fixed at 88dBA or 93dBA (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).

The headphones are available as standard in eleven terminated versions:

Code Code Wiring Cable type Plug Spare
88dBA 93dBA cable
54-4011 54-305 Stereo Dual-side 3.5mm 3-pole (stereo) plug 54-045
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
54-4022 54-306 Stereo Single-side 3.5mm 3-pole moulded plug 54-046
with 6.35mm adapter
54-4024 54-315 Stereo Single-side 4.4mm Bantam type jack 54-050
moulded cover
54-4032 - Stereo Single-side, 3.5mm 3-pole moulded plug 54-036
coiled with 6.35mm adapter
54-4033 54-311 Stereo Single-side, Neutrik 3-pole (stereo) A-gauge plug 54-065
coiled
54-4037 - Stereo Single-side, Neutrik B-gauge with black cover 54-065
coiled

Technical Specification:

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

Beyerdynamic DT231 and DT234

The DT231 is a lightweight closed headphone, impedance 32 ohms, with a 2.5m straight or coiled cable terminated with a 3.5mm 3-pole jack plug with 6.35mm A-gauge plug adapter, or coiled cable terminated with a Neutrik A-gauge jack plug. The DT234 is the headset version of the DT231, suitable for multimedia applications, and has a noise-cancelling electret microphone fitted to a 150mm boom. The microphone output is unbalanced and requires a supply voltage 1.5-9VDC. The headset is terminated with two 3.5 mm 3-pole jack plugs on a 1 metre Y-cable.

Beyerdynamic DT250

A professional monitoring headphone with great comfort for extended wearing.

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).

Beyerdynamic DT297PV

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.

Beyerdynamic DT770-Pro

Closed ear design, 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.

Beyerdynamic DT100 and DT109

The closed back DT100 headphones and DT109 headsets both have 400 ohm capsules, the DT109 has a 200 ohm dynamic microphone. 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 Details
88dBA 93dBA
54-4071 54-336 Straight cable, wired stereo, terminated with 3.5mm 3-pole
moulded plug with 6.35mm adapter
54-4072 54-334 Straight cable, wired stereo, terminated with Neutrik stereo
(A-gauge) plug
- 54-333 Straight cable, wired stereo, terminated with Switchcraft
B-gauge plug (black cover)
- 54-330 Without cable (for users requiring to use coiled cables)

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 Wiring Conventions in the Tecpro section of this catalogue for details):

54-341 Straight cable, wired mono, terminated with XLR 4-pin female
54-342 Straight cable, wired stereo, terminated with XLR 5-pin female
54-343 Straight cable, unterminated
54-340 Without cable (for users requiring to use coiled cables

Technical Specification:

Frequency response: 30-20000Hz
Input impedance: 500 ohms per earpiece, nominal
Sensitivity: 90dB for 1mW @ 1000Hz, nominal
Weight: 350g (excluding cable)

Canford DMH205 and DMH285

Heavy duty ‘closed ear’ general purpose or studio 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 or B-gauge plug. Impedance 2 x 400 ohms.

Sony 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 and SRH840

Closed-back, circumaural headphones designed for recording and programme monitoring, with 3 metre straight cables. Both types are available with 3.5mm plugs with 6.35mm A-gauge adapters. The SRH440 is additionally available wired stereo with a Neutrik B-gauge plug with black cover.

Notes

  • 1) The quoted limit level of 93dBA and 88dBA 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.
  Description Price (£) Add to basket
CANFORD LEVEL LIMITED HEADPHONES HD480 88dBA, wired stereo, with 3.5mm 3 pole plug
£145.00
CANFORD LEVEL LIMITED HEADPHONES HD480 88dBA, wired stereo, with A-gauge plug
£145.00
CANFORD LEVEL LIMITED HEADPHONES HD480 88dBA, wired stereo, with B-gauge plug
£145.00
CANFORD LEVEL LIMITED HEADPHONES HD480 88dBA, wired BBC split-feed, with B-gauge plug
£145.00
CANFORD LEVEL LIMITED HEADPHONES HD480 88dBA, wired stereo, with 3.5mm/A-gauge plug, s/s cable
£145.00
CANFORD LEVEL LIMITED HEADPHONES HD480 88dBA, wired stereo, with Bantam plug, s/s cable

Special order product. Order cancellations may incur charges.

£145.00
CANFORD LEVEL LIMITED HEADPHONES HD480 88dBA, wired split-feed, B-gauge plug, s/s cable

Special order product. Order cancellations may incur charges.

£145.00
CANFORD LEVEL LIMITED HEADPHONES HD480 88dBA, wired stereo, 3.5mm/A-gauge plug, s/s coiled cable
£155.00
CANFORD LEVEL LIMITED HEADPHONES HD480 88dBA, wired stereo, A-gauge plug, s/s coiled cable
£155.00
CANFORD LEVEL LIMITED HEADPHONES HD480 88dBA, wired split-feed, B-gauge plug, s/s coiled cable
£155.00
CANFORD LEVEL LIMITED HEADPHONES HD480 88dBA, wired split-feed, Ntk B-gauge plug, s/s coiled cable

Special order product. Order cancellations may incur charges.

£155.00
CANFORD LEVEL LIMITED HEADPHONES HD480 88dBA, without cable
£125.00
CANFORD LEVEL LIMITED HEADPHONES DMH205 88dBA, wired stereo, with A-gauge plug

Special order product. Order cancellations may incur charges.

£175.00
CANFORD LEVEL LIMITED HEADPHONES DMH205 88dBA, wired stereo, with B-gauge plug
£175.00
CANFORD LEVEL LIMITED HEADPHONES DMH285 88dBA, wired stereo, with A-gauge plug
£195.00
CANFORD LEVEL LIMITED HEADPHONES DMH285 88dBA, wired stereo, with B-gauge plug

Special order product. Order cancellations may incur charges.

£195.00
CANFORD LEVEL LIMITED HEADPHONES MDR7506 88dBA, wired stereo, 3.5mm jack & 6.35mm adapter
£275.00
CANFORD LEVEL LIMITED HEADPHONES SRH440 88dB, wired stereo, 3.5mm jack & 6.35mm adapter
£225.00
CANFORD LEVEL LIMITED HEADPHONES SRH440 88dB, wired stereo, with B-gauge plug
£225.00
CANFORD LEVEL LIMITED HEADPHONES SRH440 88dB, wired BBC split-feed, with B-gauge plug

Special order product. Order cancellations may incur charges.

£225.00
CANFORD LEVEL LIMITED HEADPHONES SRH840 88dB, wired stereo, 3.5mm jack & 6.35mm adapter

Special order product. Order cancellations may incur charges.

£325.00
CANFORD LEVEL LIMITED HEADPHONES DT100 88dBA, wired stereo, 3.5mm jack & 6.35mm adapter
£225.00
CANFORD LEVEL LIMITED HEADPHONES DT100 88dBA, wired stereo, with A-gauge plug

Special order product. Order cancellations may incur charges.

£225.00
CANFORD LEVEL LIMITED HEADPHONES DT770-PRO 88dBA, wired stereo, 3.5mm plug, 6.35mm adapter
£255.00
CANFORD LEVEL LIMITED HEADPHONES DT231 88dBA, wired stereo, 3.5mm jack/A-gauge plug
£120.00
CANFORD LEVEL LIMITED HEADPHONES DT231 88dBA, wired stereo, 3.5mm/A-gauge plug, coiled cable
£130.00
CANFORD LEVEL LIMITED HEADPHONES DT231 88dBA, wired stereo, Neutrik A-gauge plug, coiled cable
£130.00
CANFORD LEVEL LIMITED HEADSET DT234 88dBA, wired stereo, 3.5mm jacks for PC
£185.00
CANFORD LEVEL LIMITED HEADSET DT290XJ 88dBA, wired stereo, XLR 3/M and 3-pole A-gauge plug
£465.00
CANFORD LEVEL LIMITED HEADPHONES HD480 93dBA, wired stereo, with 3.5mm 3 pole plug
£145.00
CANFORD LEVEL LIMITED HEADPHONES HD480 93dBA, wired stereo, with A-gauge plug
£145.00
CANFORD LEVEL LIMITED HEADPHONES HD480 93dBA, wired stereo, with B-gauge plug
£145.00
CANFORD LEVEL LIMITED HEADPHONES HD480 93dBA, wired BBC split-feed, with B-gauge plug

Special order product. Order cancellations may incur charges.

£145.00
CANFORD LEVEL LIMITED HEADPHONES HD480 93dBA, wired stereo, with A-gauge plug, s/s cable
£145.00
CANFORD LEVEL LIMITED HEADPHONES HD480 93dBA, wired stereo, with Bantam plug, s/s cable

Special order product. Order cancellations may incur charges.

£155.00
CANFORD LEVEL LIMITED HEADPHONES HD480 93dBA, wired split-feed, B-gauge plug, s/s cable
£145.00
CANFORD LEVEL LIMITED HEADPHONES HD480 93dBA, wired stereo, A-gauge plug, s/s coiled cable

Special order product. Order cancellations may incur charges.

£155.00
CANFORD LEVEL LIMITED HEADPHONES HD480 93dBA, wired split-feed, B-gauge plug, s/s coiled cable

Special order product. Order cancellations may incur charges.

£155.00
CANFORD LEVEL LIMITED HEADPHONES HD480 93dBA, wired split-feed, Ntk B-gauge plug, s/s coiled cable

Special order product. Order cancellations may incur charges.

£155.00
CANFORD LEVEL LIMITED HEADPHONES DMH205 93dBA, wired stereo, with A-gauge plug
£175.00
CANFORD LEVEL LIMITED HEADPHONES DMH285 93dBA, wired stereo, with A gauge plug

Special order product. Order cancellations may incur charges.

£195.00
CANFORD LEVEL LIMITED HEADPHONES MDR7506 93dBA, wired stereo, 3.5mm jack & 6.35mm adapter
£275.00
CANFORD LEVEL LIMITED HEADPHONES DT100 93dBA, wired stereo, 3.5mm jack & 6.35mm adapter
£225.00
CANFORD LEVEL LIMITED HEADPHONES DT100 93dBA, wired stereo, with A-gauge plug
£225.00
CANFORD LEVEL LIMITED HEADPHONES DT100 93dBA, wired stereo, with B-gauge plug
£225.00
CANFORD LEVEL LIMITED HEADPHONES DT100 93dBA, wired BBC split-feed, with B-gauge plug
£225.00
CANFORD LEVEL LIMITED HEADPHONES DT100 93dBA, without cable

Special order product. Order cancellations may incur charges.

£205.00
CANFORD LEVEL LIMITED HEADPHONES DT770-PRO 93dBA, wired stereo, 3.5mm plug, 6.35m adapter
£245.00
CANFORD LEVEL LIMITED HEADSET DT109 93dBA, wired mono, with XLR 4-pin female

Special order product. Order cancellations may incur charges.

£275.00
CANFORD LEVEL LIMITED HEADSET DT109 93dBA, wired stereo, with XLR 5-pin female
£275.00
CANFORD LEVEL LIMITED HEADSET DT109 93dBA, unterminated
£275.00
CANFORD LEVEL LIMITED HEADSET DT109 93dBA, without cable

Special order product. Order cancellations may incur charges.

£275.00
CANFORD LEVEL LIMITED HEADPHONES DT250 88dBA, wired stereo, 3.5mm/A-gauge plug
£295.00
CANFORD LEVEL LIMITED HEADSET DT280XJ 88dBA, wired mono, XLR 3/M and 3-pole A-gauge plug

Special order product. Order cancellations may incur charges.

£385.00
CANFORD LEVEL LIMITED HEADSET DT290XLR5M 88dBA, wired stereo, XLR 5/M

Special order product. Order cancellations may incur charges.

£465.00
CANFORD LEVEL LIMITED HEADSET DT297PV 88dBA, wired stereo, XLR 3/M and 3-pole A-gauge plug

Special order product. Order cancellations may incur charges.

£495.00
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