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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.

Содержание Desktop Portable Amp

Страница 1: ...f your head with the vivid colors of your favorite mu sic Add the DAC option and you ll be able to feed you amp from any source with either Toslink optical or coax digital output or from a computer s USB connection There aren t many portables around these days that have digital outs but most of today s portable DVD players play CDs and have digital outs that operate under battery power You ll be a...

Страница 2: ...ge is a blob on the left a blob on the right and a blob in the middle The HeadRoom cross feed provides the natural acoustic cross feed normally heard at the left and right ear as heard from the left and right speaker Adding back the normally occurring cross feed signal gives your brain enough information to build the stable and natural audio image needed to have a quality listening experience See ...

Страница 3: ...into this connector 3 Power Source Selector To the right is the power source switch which allows you to select battery power or external power to run your Desktop Por table Amp The amp will run on either four D cell batteries or an external power supply We offer two power supplies the less expensive version lovingly known as brick power supply comes with the amp the more expensive Desktop Power Su...

Страница 4: ...ion 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 The Desktop DAC is a clean well balanced and natural sounding converter It uses the Cirrus Logic s flagship CS4398 24bit 192kHz 120dB dynamic range digital to analog converter Coupled with extensive power supply isolation and regulation this DAC will take virtual...

Страница 5: ...p amps for the internal input buffer crossfeed summer and power amp volt age gain stage The output current amplifier is our version of the highly regarded Dia mond Buffer discrete transistor design by Walt Jung Resistors are 1 metal thin film and caps in the signal chain are polyphenylenesulfide poly film these are MUCH higher quality parts than you d ever find in a typical consumer electronics product...

Страница 6: ...e refer servicing to HeadRoom factory authorized personnel as HeadRoom is the only authorized service center for HeadRoom products either in or out of warranty Tampering by persons other than Head Room factory authorized personnel is discouraged and will void your warranty HeadRoom will not accept warranty claims for damage resulting from accident misuse neglect abuse or failure to follow instruct...

Страница 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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