A S L C O M M U N I C A T I O N S Y S T E M S RoXX-Series 301 Manual
RoXX-Series
301 Personal Headphone Amplifier / Line Checker
Manual
The RoXX-Series 301 by ASL is a versatile professional stereo headphone amplifier for
personal and portable use. The unit is battery powered and accepts all commonly used
audio signals: balanced and unbalanced signals at microphone, line or speaker level.
This Personal Headphone Amplifier has been designed with great precision. However, designing equipment like this
is always a matter of finding compromises between: max. gain, noise, max. output power, distortion, power
consumption, flexibility, mechanical aspects, costs etc. The starting point of this design was to make a versatile unit,
which can be used for many purposes in different circumstances, with long battery life and as little as possible
controls. We hope we managed to meet your requirements. Read this user manual first.
Applications for the ASL RoXX - Series 301 Personal Headphone Amplifier
Practicing through headphones
Checking microphone signals
An electronic instrument (guitar, keyboard) or a CD
Very usefull to, for instance, boom operators.
player can be connected to the (stereo) Jack input(s),
and a dynamic microphone can be connected to the
XLR input. These signals can be mixed to the stereo
headphone output to practice. Even two headphones
can be connected in order to allow a singer to practice
together with an instrumentalist.
Creating a monitoring system for studio or on
stage use
An output of the mixing console can be connected to
the stereo input of the PHA, and a microphone or
instrument can be connected to the XLR input with a
loop through to a mixing console input. The performer
can make his own mix between his own voice /
instrument and the signal from the mixing console.
Headphones can be used in a studio, ear plugs on
stage.
Boosting a headphone output
Whenever the headphone output power of any equip-
ment is not sufficient, the Personal Headphone Am-
plifier can be connected to that headphone output.
The output power of the PHA will be high enough for
most circumstances/purposes.
Trouble shooting
A sound engineer can check lines, microphones or
outputs, to locate signals or to solve problems.
Routing two headphone outputs to one headset
For instance the monitor outputs of two mixing con-
soles, or the monitor output of a mixing console and
an intercom signal.
Setting up a (battery powered) two station inter-
com system
A dynamic (headset)microphone can be connected to
the XLR input of each of the two PHA’s. The loop
through XLR’s are interconnected. The two users can
hear eachother (and themselves) through the con-
nected head(set)phones. Two identical microphones
need to be used, and the microphone signals are
summed by there output resistance.
Sending an audio signal to many headphones
Two headphones can be connected to one PHA.
Personal headphone amps can be interconnected
using the loop through connectors.
More applications to be discovered by yourself!
