MP3 Hearing Protection Circuit

 

OPERATION:

A)  Adjust  Fit – (ALL PRO EARS MODELS)The headband may be adjusted to ensure the cups fit correctly around the ears by sliding the headband apart. With the slider arms fully closed place the headband directly in the middle of the head.  Slowly adjust one slider arm at a time as needed to ensure each cup is fully covering your ear.   The two slider arms should be equidistant from the headband to ensure the best fit.  Be sure the headband is resting snuggly against the top of your head.  The special, replaceable ProForm Leather™ Sealing Rings are made for maximum comfort and noise protection.  There should be no gaps between the ear seal and your head.  For best fit ensure your hair is not under the ear seal.  To test for a good seal, run your index finger around the area between the ear seal and your skull and ensure there are no gaps.

B). Batteries – (All PRO EARS electronic models) come equipped with four 'N' size 1.5 volt batteries, two for each cup (some Pro Tac Gold models operate on Lithium 123a batteries). Alkaline batteries provide the best service. To install, turn the volume controls to the “Off”' position. Carefully pull  open the foam flap on the inside of the cup to reveal the battery holder. Remove the old batteries, insert the new batteries with negative to negative and positive to positive side. The correct polarity is marked in the battery holder. Once batteries are installed, carefully replace foam in the ear cup. We recommend the volume controls be turned to the ‘Off’ position when not in use.  Gold Series models have an Auto Shut-Off feature which will help save battery life if you forget to turn off the unit.

C). Adjust volume – (ALL PRO EARS ELECTRONIC MODELS) Before putting on your Pro Ears turn the two Volume Control knobs to the 'Off' position. Turn on the Volume Controls and adjust as needed for comfort. We recommend to adjust each Volume Control separately.  Turn on the right side only.  Adjust the volume so that you can hear your external environment as if you were not wearing a hearing protector.  Without further adjustment to the volume, remove the right cup from your ear and adjust the left Volume Control knob until you can hear as if you were not wearing a hearing protector. Place both cups on your ears.  Both sides should now be adjusted for true stereo sound based on your individual hearing ability and purpose.  To increase the Gain, slowly increase the Volume Control.

E). Changing the headband – One of the advantages of Pro Ears hearing Protection is the modular construction.  The headband is designed to provide optimal comfort without sacrificing performance.  Over time the headband can become elongated and reduce necessary compression for good performance. Replacement headbands are available at www.proears.com . To change the headband simply separate the yoke from the cup by slowly pulling the prongswith steady pressure whle slightly rotating back and forth, , one at a time, from the grommets on each side of the cup. (DO NOT separate the yoke from the headband sliders as these are VERY difficult to reconnect!). Replacement headbands will be shipped with yoke and sliders connected.  Be sure not to lose the grommets on each side of the cup ass these are necessary to maintain optimal performance.

F). Changing the ear seals – The high performance ear seal should be replaced if the outer surface becomes stiff, craked or damaged.  Depending on use, storage and wear conditions we recommend the ear seals be replaced every 6 to 18 months.  New ear seals  and hygiene kits can be obtained at www.proears.com.  To replace the ear seal simply insert a flat head screw driver inside the cup, between the hard plastic flange of the ear seal and the cup and give a slight twist.  The ear seal should separate from the cup with a gentle motion.   Do not pry on the soft Pro Form ™ ear seals . Be careful not to damage the electronics or the speaker.


G). Program (Gold Series Only) – THERE ARE MULTIPLE GENERATIONS OF “GOLD SERIES” MODEL CIRCUIT BOARDS. THE BOARD LAYOUT HAS CHANGED (LOCATION OF THE JUMPERS AND PINS) AND THE “SPEAKER” ADJUSTMENT HAS BEEN CHANGED TO “AUDIO SELECT”.  THE “GAIN” ADJUSTMENT HAS REMAINED THE SAME.  THE PROCESS TO CHANGE THE PROGRAM HAS NOT CHANGED.  PLEASE REFER TO THE CORRECT INSTRUCTION BASED ON THE LABELS ON YOUR CIRCUIT BOARD.

Generation III circuit board labeled “AUDIO SELECT” AND “GAIN”

Pro Ears Gold Series models have two internal circuit board settings. Pins or jumpers are used to program the circuit boards for optimal sound quality from external sources and GAIN settings. The internal settings are completely independent of the outer volume control knob.

Electronic Hearing Protection Settings
Gain Jumper:

The GAIN jumper selects the units front end gain, The jumper should be set to the LOW position for most conditions and uses. This includes shooting range target practice, outdoors shooting events, etc.

The HIGH gain setting is designed for use when hunting and any other event where more gain is required, the gain is 2X in this mode.

Audio Select Jumper:

The AUDIO SEL jumper PIN is used to route the external audio to the final amplifier via a direct route if set to MP3 or via the sound compressor if set to RADIO mode.

The MP3 mode will give the best sound for music as the audio bypasses the compression circuit.  When external audio is run through the compression circuit some of the high notes can become clipped. External sounds, not generated by the MP3 player will continue to compress if above 82 dB.  The volume for the MP3 player is controlled by your external device, not the Pro-Ears volume control knobs.  We recommend you set your external device to a low, comfortable setting to protect your hearing and adjust your Pro Ears Volume Controls to allow you to remain aware of your surroundings.


The RADIO mode is to be used with two-way radios, scanners or any type of communication device in which limited sound is more important than sound replication.  In this mode the audio is routed via the sound compressor, compressing the loud peaks and leveling the audio. External sounds, not generated by the MP3 player will continue to compress if above 82 dB.  The volume for the MP3 player is controlled by your external device, not the Pro-Ears volume control knobs.  We recommend you set your external device to a low, comfortable setting to protect your hearing and adjust your Pro Ears Volume Control to allow you to remain aware of your surroundings.
  

Generation I and II circuit boards labeled “SPKR” and “GAIN”

THE FIRST TWO GENERATIONS OF GOLD SERIES CIRCUIT BOARDS HAVE IDENTICAL PROGRAMS AND OPERATION.  THE ONLY DIFFERENCE IS THE LOCATION OF THE JUMPERS AND PINS. ON GENERATION I CIRCUIT BOARDS THE PINS ARE LOCATED ON THE SIDE OF THE BATTERY HOLDER. ON GENERATION II CIRCUIT BOARDS THE PINS ARE LOCATED ON TOP OF THE BATTERY HOLDER. 
SPEAKER JUMPER:
The SPKR jumper is used to control speaker output.  When set to LOW the speaker output is reduced.  When set to HIGH the speaker output is increased.  The SPKR setting is factory preset to LOW.  The HIGH setting is intended for those individuals who require more output due to hearing loss.
GAIN Jumper:

The GAIN jumper selects the units front end gain, The jumper should be set to the LOW position for most conditions and uses. This includes shooting range target practice, outdoors shooting events, etc.

The HIGH gain setting is designed for use when hunting and any other event where more gain is required, the gain is 2X in this mode.


Changing the Jumper setting

Changing the jumper settings is a delicate operation. Altus Brands is not responsible for damage caused as a result of this procedure.
To avoid damage, please read all the instructions BEFORE adjusting the pin settings.
Changing Jumper settings - When looking at the battery holder and circuit board, the left set of three pins are for setting external music source (as shown). When the black jumper is covering the left and center pins (MP3), the source is set for optimal sound replication from an externally connected device. When the jumper is covering the center and right pin (RADIO) the external sound source is routed through the compression circuit prior to the speaker.  The jumper must always be covering two pins.
The 2nd set of pins located on the right side of the circuit board are for GAIN Level (as shown).  When the jumper is covering the left and center pins the GAIN is on HIGH. When the jumper is covering the center and right pin the GAIN is set to LOW. The GAIN comes factory pre set to the LOW position (excluding Stalker models which are factory preset to HIGH).
Prior to making a change to these settings ensure your Pro-Ears are in the off position. You will see that there are two easy grab tabs or jumpers, each covering two pins. To make the desired change pull the jumpers straight up with your fingers or a set of tweezers or a small pair of needle nose pliers, move the jumper over to the desired pins and push the jumper straight down onto the pins.  Be careful not to apply to much pressure and stop when jumper is fully seated.
Generally users are able to adjust the pin settings without removing the ear seal and internal noise attenuating foam which covers the battery compartment.  In some cases people find it is necessary to remove the ear seal and noise attenuating foam to obtain a clearer access to the PINs.  If you find this necessary please follow these directions carefully.
If damage occurs to either the foam or the ear seal please contact our Service Department as these materials are critical to the safe use of this product.  Hearing damage could result from use with damaged or torn ear seals and foam.
To remove the ear seal please refer diagram A and these instructions.



You will need a flat blade screw driver. Hold the cup horizontal in your left hand with
the on off knob toward your fingers, place the screw driver down flat on the gray foam that is in cup,
slide the screw driver between the black plastic flange attached to the leather ear seal and the hard plastic cup. Twist the screwdriver to pop off the ear seal.  This process should require minimal pressure.  Do not apply too much pressure which could damage the leather ear seal or the on/off switch.


IMPORTANT!
1). PRO EARS are durable however it is not advisable to expose them to extreme heat or cold or direct moisture as this can damage the electronics.
2). Check to ensure batteries are in good condition. Even though PRO EARS have a long battery life it is advisable to always carry a spare set.