Earphones are the solution when space within the coil is limited

Some headcoils allow insufficient space to accommodate circumaural headphones. BOLDfonic earphones are a simple and elegant solution which places the headphone driver unit just outside the headcoil, and delivers the audio to the ear via a short airtube and passive earbud.

Electro-dynamic earphone drivers

The drivers use the same proven electrodynamic system technology as the standard BOLDfonic headphone. They're safe to place within the bore or headcoil, so you can position them wherever is convenient. Ideally they should be reasonably close to to the ear, in order to keep the airtube length short. The drivers are connected to the control box either via the RF filter panel.

Airtube options

The airtube can be detached from the driver, so that the ear plugs can be inserted conveniently while outside the bore. Various lengths of airtube are available, depending on where you choose to place to drivers.

The sound pressure level at the driver is over 130dB, and decreases as the airtube length increases.

The frequency response is also a function of the tube length, for example 40Hz-12kHz for a 30cm tube or 40Hz-5kHz for an 80cm tube.

Earplug options

Various types of earplug are available.

Passive ear defenders

Passive ear defenders can be placed over the ears to reduce scanner noise. The ear defenders squash down well, taking up relatively little space.