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Manual Sennheiser HMEC 305-C

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  • Sennheiser HMEC 305-C - page 1

    Headset HMEC 300 HMEC 302 HMEC 305 HMEC 305-C HMEC 306 HMEC 322 HMEC 400 HMDC 322 111 ™ Instructions for use ...

  • Sennheiser HMEC 305-C - page 2

    112 Contents Safety tips .................................................................................................... 113 Headset featur es .............................................................................................. 114 Product variants ...................................................................................... ...

  • Sennheiser HMEC 305-C - page 3

    113 The HMEC 300, HMEC 302, HMEC 305,HMEC 305-C, HMEC 306, HMEC 322, HMEC 400 and HMDC 322 are pilot headsets with closed ear protector headphones and NoiseGard™ active noise compensation for use in helicopters, propeller and turboprop aircraft. Safety tips • With the NoiseGard™ active noise compensation turned on, typical aircraft sounds (fo ...

  • Sennheiser HMEC 305-C - page 4

    114 Headset featur es HMEC 300 NoiseGard™ headset • New active headset with effective attenuation of external noise across the entire frequency spectrum due to NoiseGard™ active noise compensation • NoiseGard™ active noise compensation provides clear communications even in the noisiest environment • Excellent comfort due to very low wei ...

  • Sennheiser HMEC 305-C - page 5

    115 • Power supply for NoiseGard™ is provided via on-board power supply system, cigarette lighter socket or battery pack • Fail safe operation in case of power failure • Supply voltage for the NoiseGard™ system is processed by the in-line electronics in the connecting cable • Made in Germany, two-year warranty Product variants HMEC 302 ...

  • Sennheiser HMEC 305-C - page 6

    116 HMEC 305-C NoiseGard™ headset The HMEC 305-C differs from the HMEC 300 in the following features: • No Mono/Stereo switch • Connection of headphones and microphone via XLR-5 plug HMEC 306 NoiseGard™ headset The HMEC 306 differs from the HMEC 300 in the following features: • Connection of headphones, microphone and NoiseGard™ electro ...

  • Sennheiser HMEC 305-C - page 7

    117 HMEC 400 NoiseGard™ headset The HMEC 400 differs from the HMEC 300 in the following features: • Stylish silver design • Leatherette ear cushions • Headband padding can be buttoned HMDC 322 NoiseGard™ headset The HMDC 322 differs from the HMEC 300 in the following features: • No Mono/Stereo switch • Coiled cable • M-87/AIC dynami ...

  • Sennheiser HMEC 305-C - page 8

    118 Delivery includes HMEC 300, HMEC 305-C, HMEC 322, HMEC 400 and HMDC 322 headsets • Headset • 3-pin XLR socket for aircraft panel mounting (power supply via the on-board system) • Padded carry and storage bag with shoulder strap for headset and accessories • Wind screen for microphone (except HMDC 322) • MZQ 2002-1 Cable clip (Cat. No. ...

  • Sennheiser HMEC 305-C - page 9

    119 ACX-1 ACX-2 ACX-11 ACX-22 Recommended accessories Replaceable gel ear cushions (Cat. No. 83140) BP-03 battery pack (except for HMEC 302, HMEC 305 and HMEC 306) Battery pack with XLR-3 socket for powering the NoiseGard™ electronics of the HMEC 300, HMEC 305-C, HMEC 322, HMEC 400 and HMDC 322 headsets. Four 1.5 V AA size alkaline manganese batt ...

  • Sennheiser HMEC 305-C - page 10

    120 Connecting the headsets Connecting cables for headsets HMEC 300 and HMEC 400 headsets: 1 1 / 4 ” (6.35 mm) stereo jack plug for connecting the headphones 1 PJ-068 jack plug for connecting the microphone 1 XLR-3 plug for connecting the power supply for the NoiseGard™ electronics HMEC 302 headset: 1/ 4 ” (6.35 mm) stereo jack plug for conne ...

  • Sennheiser HMEC 305-C - page 11

    121 Connecting cable for HMEC 322 and HMDC 322 HMEC 305-C headset: 1 XLR-5 plug for connecting the headphones and the microphone 1 XLR-3 plug for connecting the power supply for the NoiseGard™ electronics HMEC 306 headset: 1 6-pin Redel plug for connecting the headphones, the microphone and the power supply for the NoiseGard™ electronics HMEC 3 ...

  • Sennheiser HMEC 305-C - page 12

    122 Powering options There are three options for powering the NoiseGard™ active noise compensation: 1. Connection to the on-board system (12–35 V DC) 2. Connection to the BP-03 battery pack (accessory, except for HMEC 302, HMEC 305 and HMEC 306) 3. Connection to the cigarette ligther socket (12–35 V DC) via adapter cable (accessory, except fo ...

  • Sennheiser HMEC 305-C - page 13

    123 1. Connecting the headset to the on-board system The NoiseGard™ electronics can be connected to on-board power supply systems with operating voltages between 12–35 V DC. The HMEC 300, HMEC 305-C, HMEC 322, HMEC 400 and HMDC 322 headsets are supplied with an XLR-3 socket for panel mounting in the aircraft. The XLR-3 socket must be mounted by ...

  • Sennheiser HMEC 305-C - page 14

    124 Headset HMEC 302: 씰 Connect the 1 / 4 ” (6.35 mm) stereo jack plug for the headphones and the PJ-068 jack plug for the microphone to the corresponding jack sockets of your intercom. HMEC 305 headset: 씰 Connect the XLR-5 plug to the aircraft’s XLR-5 socket. Headset HMEC 305-C: 씰 Connect the XLR-5 plug for the headphones and the microph ...

  • Sennheiser HMEC 305-C - page 15

    125 2 . Connecting the headset to the battery pack (except HMEC 302, HMEC 305 and HMEC 306) The NoiseGard™ electronics of the HMEC 300, HMEC 305-C, HMEC 322, HMEC 400 and HMDC 322 headsets can also be powered via the BP-03 battery pack (  ‘Recommended accessories’). The battery pack can be operated either on standard or rechargeable batter ...

  • Sennheiser HMEC 305-C - page 16

    126 Connecting the headset, turning on the battery pack 씰 Connect the XLR-3 plug of the headset connecting cable to the XLR-3 socket o n t h e connecting cable of the battery pack. 씰 HMEC 300 and HMEC 400 headsets: Connect the 1 / 4 ” (6.35 mm) stereo jack plug for the headphones and the PJ-068 jack plug for the microphone to the correspondin ...

  • Sennheiser HMEC 305-C - page 17

    127 ACX-1 ACX-2 ACX-11 ACX-22 3 . Connecting the headset via a cigarette lighter adapter cable (except HMEC 302, HMEC 305 and HMEC 306) Sennheiser offers special adapter cables with XLR-3 socket for connecting the NoiseGard™ electronics of the HMEC 300, HMEC 305-C, HMEC 322, HMEC 400 and HMDC 322 headsets to the on-board power supply via the ciga ...

  • Sennheiser HMEC 305-C - page 18

    128 Pr eparing the headsets for use Adjusting the headband For good noise attenuation and best possible comfort, the headband has to be adjusted to properly fit your head: 씰 Wear the headset so that the headband runs over the top of your head. 씰 Adjust the length of the headband so that • your ears are completely inside the ear cushions, • ...

  • Sennheiser HMEC 305-C - page 19

    129 Positioning the microphone Relocating the microphone boom The microphone boom can be worn on either side of the mouth. 씰 Loosen the quick-fixing device. 씰 Rotate the microphone boom by 180 ° . 씰 Tighten the quick-fixing device. Positioning the microphone towards the corner of the mouth The HMEC 300, HMEC 302, HMEC 305, HMEC 305-C, HMEC 3 ...

  • Sennheiser HMEC 305-C - page 20

    130 For positioning the microphone of the HMDC 322 headset, proceed as follows: 씰 Adjust the length of the microphone boom so that the microphone is placed at the corner of the mouth. To do so, loosen the quick-fixing device and adjust the microphone boom in length. 씰 Pull the middle part of the microphone boom towards the mouth so that the dis ...

  • Sennheiser HMEC 305-C - page 21

    131 Additional information for helicopter use of the HMEC 322 headset The polarity of the microphone connection in helicopters is not standardized. If the microphone of your headset does not work with the existing polarity, you can reverse the polarity on the headset by simply rotating the microphone module. To do so, please proceed as follows: 1. ...

  • Sennheiser HMEC 305-C - page 22

    132 Using the headsets Turning NoiseGard™ on/off With the NoiseGard™ active noise compensation turned off, the headset can be used as a conventional headset. Turn on the NoiseGard™ active noise compensation by setting the ON/OFF switch to ON. When using the BP-03 battery pack, set the NoiseGard™ ON/OFF switch to ON and use the ON/OFF switch ...

  • Sennheiser HMEC 305-C - page 23

    133 Mic Gain Adjustment Adjusting the microphone gain According to JTSO approval C58a, the microphone output voltage has to be factory- preset to 400 mV. If this output voltage is too high or too low for your intercom system, it can easily be re-adjusted on the microphone. To do so, use a small slotted screwdriver and turn the ”Mic Gain Adjustmen ...

  • Sennheiser HMEC 305-C - page 24

    134 Spar e parts The following spare parts are available from your Sennheiser agent: • Wind screen for MKE 45-1 electret microphone • Ear cushions • Headband padding • Cable clip • Carry and storage bag with shoulder strap Replacing the wind screen If the wind screen for the electret microphone shows signs of wear such as tears or holes, ...

  • Sennheiser HMEC 305-C - page 25

    135 Replacing the headband padding Replace the headband padding if it is damaged. 씰 Pull the Ziploc type fastening strips of the headband padding apart and remove the worn headband padding. 씰 Put the new headband padding around the headband. 씰 Pull the two edges of the headband padding together so that the fastening strips slightly overlap. ? ...

  • Sennheiser HMEC 305-C - page 26

    136 In case of dif ficulty If problems occur that are not listed in the below table, please contact your Sennheiser agent. Problem Clear communication but no active noise compensation Possible cause and what to do The NoiseGard™ electronics are turned off. 씰 Check to see if the ON/OFF switch is set to ON. The XLR-3 plug has been pulled out of t ...

  • Sennheiser HMEC 305-C - page 27

    137 Problem Active noise compensation but very low volume communication Possible cause and what to do The volume control is set too low. 씰 Check the volume setting of the headset. The headphone connection has been pulled out (except HMEC 305, HMEC 305-C and HMEC 306). 씰 Check to see if the headphone jack plug is correctly connected. The microph ...

  • Sennheiser HMEC 305-C - page 28

    138 V aluable information on NoiseGard™ The NoiseGard™ principle One of the greatest stress factors today is noise. Research has shown that noise affects the nervous system, and can cause tiredness, poor concentration, irritability and tension. Of even greater concern is the permanent damage to hearing that can result from noise at high levels. ...

  • Sennheiser HMEC 305-C - page 29

    139 A In response to these problems, Sennheiser has developed an active noise compensation system – NoiseGard™ – which, combined with a high-quality passive hearing protector, provides consistent noise attenuation over the entire audio range. The overall noise level is reduced so that the radio volume can be turned down but enough noise still ...

  • Sennheiser HMEC 305-C - page 30

    140 The above diagram shows noise compensation with NoiseGard™: Passive hearing protectors effectively attenuate noise from the middle and upper frequency range, the effect decreasing sharply in the lower range. However, active noise compensation with NoiseGard™ combined with passive hearing protectors results in a reduction of noise of approx. ...

  • Sennheiser HMEC 305-C - page 31

    141 23 1 4 2 1 3 solder side 5 3 1 2 1 2 3 4 6 Connector assignment U174/U jack plug 1 Microphone Lo 2 Audio Hi 3 Microphone Hi 4 Audio Lo HMEC 300 1 Not assigned! 2 Microphone Hi 3 Microphone Lo 1 / 4 ” (6.35 mm) stereo jack plug 1 Audio Hi left 2 Audio Hi right 3 Audio Lo XLR-3 connector (NoiseGard™) 1 Power supply NoiseGard™ (DC+) 2 Ground ...

  • Sennheiser HMEC 305-C - page 32

    142 T echnical data HMEC 300 HMEC 302 HMEC 306 HMEC 400 Headphones Transducer principle dynamic Ear coupling circumaural, closed Frequency response 45–15,000 Hz Nominal impedance active/passive 300/150 Ω , mono 600/300 Ω , stereo Attenuation (active and passive) > 25 – 40 dB Max. sound pressure level 120 dB ( ± 5%) Contact pressure appr ...

  • Sennheiser HMEC 305-C - page 33

    143 HMEC 300 HMEC 302 HMEC 306 HMEC 400 General data Connecting cable 1.5 m, unilateral Weight without cable 370 g Power supply for NoiseGard™ 12–35 V DC Current consumption 27 mA (zero signal current), max. 80 mA Fuse 500 mA thermo fuse Connectors 6.35 mm stereo jack plug 6.35 mm stereo jack plug 6-pin Redel plug for 6.35 mm stereo jack plug f ...

  • Sennheiser HMEC 305-C - page 34

    144 T echnical data HMEC 305 앚 HMEC 305-C 앚 HMEC 322 앚 HMDC 322 Headphones Transducer principle dynamic Ear coupling circumaural, closed Frequency response 45–15,000 Hz Nominal impedance active/passive 300/150 Ω , mono 앚 50/35 Ω , mono Attenuation (active and passive) > 25 – 40 dB Max. sound pressure level 120 dB ( ± 5%) Contact ...

  • Sennheiser HMEC 305-C - page 35

    145 HMEC 305 앚 HMEC 305-C 앚 HMEC 322 앚 HMDC 322 General data Connecting cable 1.5 m, unilateral 앚 coiled cable, unilateral Weight without cable 370 g Power supply for NoiseGard™ 12–35 V DC Current consumption 27 mA (zero signal current), max. 80 mA Fuse 500 mA thermo fuse Connectors XLR-5 for headphones, 앚 XLR-5 for headphones 앚 U-1 ...

  • Sennheiser HMEC 305-C - page 36

    146 Certificate of Conformity Sennheiser electronic GmbH & Co. KG declare that this device conforms to the applicable CE standards and regulations. For up-to-date information on Sennheiser products, you can also visit the Sennheiser Web site at “http://www.sennheiser.com”. ...

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