MA 42
Complete, portable
two-channel audiometer
Master hearing aid capabilities
The master hearing aid is an important feature
that’s used to demonstrate the benefits of aided
amplification. Select four commonly used fre-
quency slopes to approximate hearing aid
acoustics, and let your patients actually experi-
ence the difference hearing aids can make.
Two channel versatility
Increase your testing capabilities! Two channels
allow you to conduct binaural aided and unaided
speech testing with a variety of speech media for
your pre- and post-hearing aid fitting evaluations.
Exceptional features
The standard features are out of the ordinary:
ergonomic controls, separate insert phone jacks,
CD/tape input, monitor speaker, monitor/mic head-
set and built-in amplifiers that provide you with
ample power to connect directly to your speaker system. Optional accessories that include a free field system, talk-
back mic and insert phones make the MA 42 as powerful as some clinical audiometers on the market today.
Technical Data
Frequency accuracy . . . .±1% maximum
Attenuator linearity . . . .±.5dB per 5dB step
Distortion . . . . . . . . . . . ..5% typical, 2% maximum
Rise/fall time . . . . . . . . . .35 msec. typical
Frequency modulation . .±5% triangle wave modulation
at 5Hz
Voltage requirements . . .117/234 volts AC, switchable
Frequency range . . . . . . .125 - 8000 Hz
Hearing level range:
Air conduction . . . . . . .-10 to 110 dB HL
Bone conduction . . . . .-10 to 70 dB HL
Narrow band noise . . . .-10 to 100 dB HL
Master hearing aid:
SPL/gain control . . . . .15-65 dB gain in 5 dB
increments
Calibration accuracy . .±3 dB SPL
Input cal. level . . . . . . .0 VU corresponds to
60 dB SPL
Slopes . . . . . . . . . . . . . .Flat, 6, 12 and 18 dB/octave
low cut filters
Dimensions . . . . . . . . . . .12.5” W x 6.25” H x 15.5” D
32cm W x 16cm H x 40cm D
Weight . . . . . . . . . . . . . . .16.5lb/7.5kg
Standard Accessories
Part Number Part
4687 . . . . . . . . . . . . . . .TDH 39 headset
2835 . . . . . . . . . . . . . . .B-71 bone receiver and cord
1037-37 . . . . . . . . . . . .Bone headband
5520 . . . . . . . . . . . . . . .Monitor headset with
speech mic
1162-417 . . . . . . . . . . .Audiogram pad
1162-9811 . . . . . . . . . .Operator’s manual
2169 . . . . . . . . . . . . . . .Patient response switch
Optional Accessories
Part Number Part
6619 . . . . . . . . . . . . . . .Talk-back mic
1025-352 . . . . . . . . . . .Patch cord
4790 . . . . . . . . . . . . . . .Insert phones (10 ohm)
4695 . . . . . . . . . . . . . . .Audiocup headset
5525 . . . . . . . . . . . . . . .Sound field kit
CPT Codes
92551 . . . . . . . . . . . . . .Screening, pure tone
92552 . . . . . . . . . . . . . .Threshold, air
92553 . . . . . . . . . . . . . .Air and bone
92555 . . . . . . . . . . . . . .Threshold, speech
92556 . . . . . . . . . . . . . .Threshold, discrimination
92557 . . . . . . . . . . . . . .Basic comprehensive
92590 . . . . . . . . . . . . . .Hearing aid exam and
selection, monaural
92591 . . . . . . . . . . . . . .Binaural
92592 . . . . . . . . . . . . . .Hearing aid check, monaural
92593 . . . . . . . . . . . . . .Binaural
Specifications subject to change without notice
MA 42 Accessories
MA42 8/00
ONE YEAR LIMITED WARRANTY: This warranty is extended to the original purchaser of the instrument, by Maico, through the
Distributor from whom it was purchased. The warranty covers defects in material and workmanship for a period of one year from
date of delivery of the instrument to the original purchaser. Accessories which are purchased from Maico at the same time as the
instrument are warranted for one year from the date of purchase. For additional information contact your Maico Distributor.
