The headphones to insert EAR - TONE ER-3A ensure several advantages, especially with regard to the stimulation in devices for the detection of auditory evoked potentials, not presenting electromagnetic stimulus artefacts in comparison with the capsules TDH39-49, assuring precision and reliability in all intensities and frequencies supported by these devices, and allowing a perfect occlusion of the ear canal, essential for proper stimulation apparatus.
The ER-3A kit includes:
> Transducers ER-3A (R + L)
> Cable with two connectors from 6.3 mm Jack
> 1 packaging inserts 3b (small)
> 1 package inserts the third (middle)
> 1 package inserts 3c (large)
> Clip

Main technical features:
Impedance: 10 Ohm, 50 Ohm or 300 Ohm.
Sensitivity at 1 kHz: 102.5 dB SPL for DB-0138 (HA-2)
@ 0.1 volts rms. (10 V)
@ 0.2 volts rms. (50 V)
103.5 dB SPL for DB-0138 (HA-2)
@ 00:49 Volt rms. (300 V)
Limits: ± 3 dB
Distortion: <3% as measured @ 500 Hz, 118.5 dB SPL
Max.output: greater than or equal to 110 dBHL at standard audiometric frequencies from 500Hz to 4000Hz