The HDM Pro is installed into the headphone cable and ensures personal Hearing Dose Management at all times, warns the user of significant levels and takes action to protect them only when necessary.
Three mechanisms are included in HDM Pro to protect the user against the causes of noise induced hearing loss from reproduced sound and to assist in meeting the Noise at Work Regulations 2005.
Typical operation of these are: the instantaneous clipping of extreme impulse signals above 118dBA SPL; the rapid management of very high signals above 100dBA SPL (but below 118 dBA SPL) using Rapid Overload Response ; the long-term Hearing Dose Management based on a rolling 24 hour assessment.
Following two years of development and successful trials, we are very pleased to announce an exclusive agreement with LimitEar which will see the HDM Pro technology integrated into Sennheiser Headphones and Headsets, starting with the HD 25 range explains Tim Sherratt, Engineering and Technical Services Manager at Sennheiser UK.
Careful use of the headphones with its level indication scheme will ensure the maximum sound levels throughout the working day with no discernable loss of sound quality. If required to, both Rapid Overload Response and long-term Hearing Dose Management will introduce high quality attenuation to ensure appropriate levels are complied with over the day, whilst allowing maximum usability with relatively high signals in the short-term.
"The genesis of the idea for HDM Pro came from the fact that noise induced hearing loss is a serious and avoidable health issue, but one that relatively few people have woken up to. If we dont address this problem soon, its going to get a lot worse, so our product protects users automatically and effectively. Were delighted that HDM Pro has been adopted by such a respected brand, says Stephen Wheatley, Managing Director at LimitEar.
The LimitEar HDM Pro will be available exclusively in the UK from HHB Communications and Canford Audio.
Technical specification Less than 3dB insertion loss
Virtually no discernable effect on sound quality, even when reducing levels
LED indication of monitoring activity, high dose battery level
Battery life greater than seven days under any usage condition; recharged using a micro USB connector
Weight: <30g additional to cable
Size: <60 x 21 x 12mm on cable; total length
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The HDM Pro is installed into the headphone cable and ensures personal Hearing Dose Management at all times, warns the user of significant levels and takes action to protect them only when necessary.
