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Contacting HeadRoom

A Word About 

Your Hearing

People have a natural tendency to listen to music at much louder levels with 

headphones  than  they  would  with  speakers.  To  avoid  permanent  hearing 

damage, it’s important to be careful not to listen at extremely loud levels (or 

to listen for too long at moderately loud levels). Because HeadRoom amps 

need to be able to drive even the most inefficient dynamic headphones to 

satisfactory listening levels, they are also able to drive headphones of aver-

age or higher efficiencies to extremely high levels. As a result, even though 

the volume control on your HeadRoom amp may appear to be set to a low 

level, you may not be listening at a safe level. Generally speaking, when lis-

tening  to  headphones you  should  only  turn  up  the volume  to  the  point  at 

which the sound isn’t too quiet.

As a general rule, sound pressure levels under 80 decibels will not damage 

hearing, even if experienced continually. On the other hand, anything over 

100 decibels may cause permanent damage very quickly. Sustained expo-

sure to sound pressure levels anywhere in between can also be damaging 

—the louder the sound, the shorter the time required to cause permanent 

damage. 

Just to drive this message home, here’s a bit of information about hearing 

damage. The most common type of damage caused by prolonged or exces-

sively loud sound is called tinnitus. It manifests itself as a sustained buzzing 

and/or ringing in the ears, and can become a permanent condition. 

If you find that your ears are ringing or that there is a sensation of pressure or 

fatigue, your body is trying to tell you that your ears need a break. Give them 

a rest for a few days (or until they feel fresh). If you ignore these symptoms, 

you’re risking permanent hearing damage.

In addition, don’t fool yourself into thinking that you either have full-blown 

tinnitus  or  you  don’t  have  it  at  all—there  are  different  degrees  of  hearing 

damage. For example, you might have a mild case where you only notice ring-

ing in your ears in the quiet of your bedroom at night. However, once you 

have a slight case of tinnitus, your ears are much more susceptible to further 

damage. So if you do experience mild symptoms, it’s important to be much 

more careful about your exposure to loud sounds.

Sorry to sound so sobering, but a lifetime of musical enjoyment requires ears 

in tiptop shape. Now that we’ve told you to be careful, don’t blame us if you 

blow it. If you have any more questions about hearing damage, call a doctor.

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Summary of Contents for Balanced Home Amp

Page 1: ...ade components regardless of cost concerns to produce an intensely liquid transparent and accurate sound rich in exquisite musical detail and jaw dropping dynamics The sense of space around the notes and the emotional nuances of the performance become vivid expressive entities with the Home amplifier The balanced version takes the Home amp s performance up another notch by driving headphones via st...

Page 2: ...d to you 4 Crossfeed Switch This switch engages the HeadRoom crossfeed circuit Audio imaging on headphones is often not very good typically the image is a blob on the left a blob on the right and a blob in the middle The HeadRoom crossfeed provides the natural acoustic cross feed normally heard at the left and right ear as heard from the left and right speaker Restoring the normally occur ring cro...

Page 3: ...ut This set of RCA connectors is for pre amp applications You can send a signal either to powered speakers or directly to a power am plifier unit 6 Ground Lift Use this handy two position switch to cancel out electrical hum interference coming from ungrounded or noisy outlets For most appli cations the switch should be set to normal If you are hearing some buzz ing try moving the ground lift to floa...

Page 4: ...9 digital input selector When purchasing the Home Amp you have the option of including a DAC If you did not purchase the DAC option with your amp initially you can have this upgrade performed at a later date When music is stored on a CD digital audio tape or hard drive it is stored as a series of numbers Each number represents the voltage of the audio signal at a particular point in time String 44...

Page 5: ...e digital selector switch on the back of the unit 3 plug your coaxial able into the back of the amplifier 4 plug the other end of your coaxial cable into the coaxial output of your player Using the Balanced Analog Inputs Hooking Up Your Home Amp via DAC Balanced Cabling Hook Up via Analog For the Sennheiser HD580 HD600 HD650 models Cardas Audio offers very highly upgraded balanced cabling which can...

Page 6: ...ectrical signal passes through a cable outside electrical noise interference can be induced even when using shielded ca bles In an unbalanced system both the positive and negative halves of the waveform travel together down the positive and negative signal leads and can be influenced by the outside noise In a balanced system the positive and negative halves of the waveform are separate when these s...

Page 7: ...resistant and have a very heavy gold plating significantly heavier than normal circuit board gold coatings This is important to the increased lifetime of the switch Volume Control Upgrade Stepped Attenuator About the HeadRoom Crossfeed Max Module The Home Module This little blue module contains all the elec tronics for a Home Headphone Amp There are two 4 layer circuit boards one each for theleftan...

Page 8: ... Fax 406 586 9484 Balanced Home Amp Warranty HeadRoom 30 Day Guaranty Unless specifically stated otherwise all HeadRoom purchases come with a 30 day satisfaction guaranty in order to give you the opportunity to evaluate your purchases We re happy to provide you with the opportunity to refund or exchange your product but to keep costs down we do have a few condi tions Products must be returned to us...

Page 9: ... anywhere in between can also be damaging the louder the sound the shorter the time required to cause permanent damage Just to drive this message home here s a bit of information about hearing damage The most common type of damage caused by prolonged or exces sively loud sound is called tinnitus It manifests itself as a sustained buzzing and or ringing in the ears and can become a permanent condit...

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