HeadRoom Portable Desktop Amp Owner'S Manual Download Page 7

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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 sat-
isfactory listening levels, they are also able to drive headphones of average 
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 listening 
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 exposure 
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 dam-
age. For example, you might have a mild case where you only notice ringing 
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 dam-
age. 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.

Summary of Contents for Portable Desktop Amp

Page 1: ...st current result of a 15 year long quest to build the world s finest portable headphone amplifier It s equally comfortable in your big rig at home or on the tray table in front of you at 30 000 feet It will take an analog or digital input from a 10 000 cd player laptop or iPod and drive your high quality headphones with authority and aplomb It s a little slice of your big rig you can take with yo...

Page 2: ...feed signal gives your brain enough information to build the stable and natural audio image needed to have a quality listening experience See pg 7 for more info on the HeadRoom crossfeed 5 Gain Switch The 3 position Gain Switch accomodates various head phones power needs For instance the Low Gain setting would be used for ear canal headphones allowing a larger range on the volume control pot Ex pe...

Page 3: ...ady to go You may listen to the amplifier while it s charg ing The battery on your Portable Desktop will last anywhere from 15 20 hours if you re using the DAC on your Portable Desktop the battery life will be lower versus using only the analog portion of your amp The lithium ion batteries in the Portable Desktop will last approximately 300 charges at which point you will need to send your amp bac...

Page 4: ...th HeadRoom The crossfeed switch in Head Room amplifiers allow you to cross feed a little of the left and right channels across to eacho ther through a short time delay The Digital Analog Convertor Far ear hears slight delay Near ear hears sound first 30 degrees off axis Portable Desktop DAC The Portable Desktop DAC is a clean well balanced and natural sounding converter It uses the Cirrus Logic s...

Page 5: ...l power source 5 VDC digital analog 15 VDC 5 VDC battery coaxial input source selector 1 8 input battery 15VDC power input s use one only ree 800 828 8184 outside U S 1 406 587 9466 optical input USB input optical USB digital input selector coaxial power source 5 VDC digital analog 15 VDC 5 VDC battery coaxial input source selector 1 8 input battery 15VDC power input L R parallel analog inputs use...

Page 6: ...imate Repairs are conducted only on Head Room products When we receive the equipment we will initiate repairs and upgrades within 1 2 weeks and return the unit to you You are responsible for shipping costs to and from HeadRoom for all non warranty repair items Equipment Exchanges If you would like to exchange your purchase for another item you have two options You can simply purchase the item you ...

Page 7: ...ls 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 cond...

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