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The HEIL Sound Pro7 headset has two large gel earpieces for a comfortable fit also during extended wearing time which also ensure a high level of suppression of ambient noise: 26 d – B attenuation according to manufacturer. – The headset is stereo so that signals from two receivers pileup and Dxpedition can be listened to and leveled out via the integrated balance controller separately. – As with all other larger HEIL headsets there is a switch for one-sided phase reversal to turn the received signal ‘in your head’ and also to ease symptoms of fatigue during contest. – The Pro7 headset has a detachable connecting cable and is available either with HC-7 dynamic microphone capsule or with an electret capsule for ICOM. The microphones are interchangable so that one headset for both equipment lines can be used. – The dynamic HC -7 element has a frequency response of 100 Hz – 12 k – Hz with the -3d – B points at 100 Hz and 12 k – Hz. The traditional healing speech enhancement is centered at 2K – 4KHz. The impedance is 600 Ohms. – The i – C electret element designed for ICOM radios has the -3d – B points at 35 Hz and 12k – Hz with a sensitivity of -48 at 1500 ohms output centered at 1k – Hz. The IC element solves the problems with older Icom radios before IC-756 with low gain but can also be used with newer Icom models with excellent results. To operate the i – C-electret element a bias voltage is applied. – The Pro7 headset is available in different colours. – Interchangeable microphones – The optional HC-74 capsule orange is a further development of the very popular HC-4 microphone capsule. It was developed to meet the high demands of demanding DXers and contesters. The low frequencies are softly limited from 600 Hz in the frequency range of 2500 – 3000 Hz which is important for intelligibility the level is increased by approx. 10 d – B. This produces a very concise SSB signal that is easily audible even in the thickest pileup.