HeadRoom The Portable Micro Amp Owner'S Manual Download Page 12

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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 The Portable Micro Amp

Page 1: ...em is a very deliberate blend of audiophile quality parts a road worthy aluminum urethane enclosure a serious battery and recharging circuit plus a well conceived set of travel accessories all tightly focused on getting you great access to your tunes whether they live on an iPod laptop or any other type of portable audio player Available with or without internal DAC the Micro Amp is sure to delive...

Page 2: ...2 The Micro Portable Amp 1 Line Input 2 Headphone Out 3 Crossfeed Switch 5 Volume Control 6 Power Source Switch 4 Gain Switch ...

Page 3: ...ng experience See pg 7 for more info on the HeadRoom crossfeed 4 GainSwitch The 3 position GainSwitch accomodatesvariousheadphones power needs For instance the Low Gain setting would be used for ear canal headphones which are extremely efficient allowing a larger range on the volume control pot Experimenting with your headphones and the Gain Switch will help you to determine which setting you pref...

Page 4: ...4 The Micro Portable Amp 1 Power Input 4 Pre Amp Output 2 Optical Coaxial Digital Input 3 USB Input DAC Option Inlcuded recharging power supply ...

Page 5: ...is input signal from the optical output of your player Not so many portable audio players have optical outputs anymore but many portable DVD players and some hard disk drive players do Of course a co axial output is available from many pieces of home equipment See pg 9 for more hook up information 3 USB Input DAC Option Only The USB input gets its signal from a computer laptop desktop or Ultra Mob...

Page 6: ... AD8397 op amp in output stage with DAC option USB optical coax inputs 16 to 24 bit operation 32 44 1 48 and 96kHz input sample rates 2 0 Vrms maximum line level output 4 2V Analog operation Independent low noise regulation for digital and analog sections of mixed signal devices Analog Devices AD823 for analog output stage PCB designed with both high speed digital design techniques and low noise a...

Page 7: ...ng from when only one ear is hearing it This tends to create an audio image that is a blob on the left blob on the right and a blob in the middle HeadRoom amplifiers cure the problem by allowing you to cross feed a little of the left and right channels across to each other through a short time delay using the crossfeed switch The usefulness of the circuit varies depending on what type of recording...

Page 8: ...urce with line out or headphone jack Source with RCA outputs Now for the best part simply plug your headphones into the head phone jack one on the front of the Micro Amp be sure to turn the vol ume down first If your headphone jack is a 1 4 termination or if you need to power more than one pair of headphones please see our expla nation in 1 on page 2 line input Home CD player with RCA outputs Port...

Page 9: ...opriate optical cable and a Toslink Optical Mini Adaptor visit headphone com to purchase these items Plug one end into your source and connect the other end into the adaptor then into the back of the amp Coaxial cable Coaxial to mini adaptor To A home CD player or other device with a Coaxial Output You will need a coaxial cable and a RCA Mini Mono Adaptor visit headphone com to purchase these item...

Page 10: ...ix it while you ve still got the product everyone s happy Portable Micro Amp Warranty The HeadRoom Portable Micro Amp is warrantied for two years Battery replace ment on the Portable Micro amp is warrantied for one year After one year your battery will replaced for a small fee If anytime within the first two years of your purchase you have a problem with your Portable Micro Amp you can return it f...

Page 11: ...ng with a return shipping label and a card to include with the defective item to return to HeadRoom Important Fill in your name and original invoice number of your order on the card and return the item to HeadRoom within 2 weeks If we have not received the product after 2 weeks allowing shipping time we will charge your credit card the amount of the defective item Please understand that we enforce...

Page 12: ...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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