HeadRoom Desktop Portable Amp Owner'S Manual Download Page 3

4

5

The Desktop Portable Amp Rear Panel

1.

RCA

Analog

Inputs

6.

7.

10.

9.

8.

4.

+/- 15 

VDC

Power 

Input

(DAC Option)

5.

Battery

input

2.

1/8”

Analog

input

3.

Power

Source

Selector

Rear Panel Description

1. RCA Analog Inputs  

There is one set of RCA inputs on the back of the 

Desktop Portable Amp.  The  analog inputs are where you will plug in your non-
digital source, such as a stationary or portable CD player.   If your player has 
an 1/8” line out plug, you will use a portable cable (mini-RCA); if it has an RCA 
out (left and right) then you will use a link interconnect (RCA -RCA).  See the 
‘cables’ area in our website to purchase some of these cables.

2. 1/8” Analog Input  

The 1/8” input is a typical line input connector.  You 

can connect your analog source by using a mini-mini cable from the line out 
(or headphone jack) of your source 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 Supply will give you cleaner juice, and therefore cleaner, more 
dynamic sound.

 

  

4. +/- 15VDC Power Input  

Plug in your power supply here.  The ‘brick’ 

power supply included with the Desktop amp, as well as the Desktop Power 
Supply, will use this connector.  See pg 9 for more info on the  Power Supply.

5. Battery Input

 Connect the battery pack included with your Desktop Por-

table Amp here.  The red battery pack included with the unit takes 4 D-cell 
batteries and provides about 20 hours of play time, with the basic Desktop 
Portable.  Upgrading the module or adding the DAC reduces playtime.

 Desktop Amp Rear Panel

see page 6

Summary of Contents for Desktop Portable Amp

Page 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...

Page 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 ...

Page 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...

Page 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...

Page 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...

Page 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...

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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