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ULTRACOUSTIC ACX1000
1.1 The design concept
The philosophy behind BEHRINGER products guarantees a no-compromise circuit design and employs the
best choice of components. The operational amplifiers used in the ULTRACOUSTIC are exceptional: they
boast extreme linearity and very low distortion characteristics. To complement this design, the choice of
components include low-tolerance resistors and capacitors, high-quality potentiometers and several other
stringently selected elements.
The ULTRACOUSTIC uses SMD technology (Surface Mounted Device). These subminiature components adapted
from aerospace technology allow for an extreme packing density to further improve the overall reliability.
The super-robust steel enclosure of your ULTRACOUSTIC, with its generously proportioned high-capacity
power supply and temperature-controlled active fan, makes sure that your ACX1000 keeps on working even
when the going gets tough. The cabinet is made of high-grade, non-polluting E1-MDF boards, which are
grooved, multi-glued and free of formaldehyde.
1.1.1 Tube emulator
A special FET circuit in your ULTRACOUSTIC emulates the positive characteristics of a tube exciter, producing
additional harmonics and a subtle compression effect which gives your guitar sounds the power to make
themselves heard and adds sustain and definition. Acoustic guitars, in particular, with their wide dynamic
range, need to produce a homogeneous sound image in all registers. The FET circuit makes sure that even the
high registers have sufficient sustain and won’t get drowned. While the WARMTH control allows you to add the
tube sound effect as desired.
By using solid-state components we succeeded in eliminating tube-specific interference noise to a great
extent; the actual tube effect is thus achieved without additional noise or hum.
1.2 Before you begin
Your BEHRINGER ULTRACOUSTIC was carefully packed in the factory and the packaging is designed to
protect the unit from rough handling. Nevertheless, we recommend that you carefully examine the packaging
and its contents for any signs of physical damage, which may have occurred during transit.
+ If the unit is damaged, please do not return it to BEHRINGER, but notify your dealer and the
shipping company immediately, otherwise claims for damage or replacement may not be
granted. Shipping claims must be made by the consignee.
Be sure that there is enough space around the unit for cooling and please do not place the ULTRACOUSTIC on
high temperature devices such as radiators etc. to avoid overheating.
+ Before you connect your ULTRACOUSTIC to the mains, please make sure that your local voltage
matches the voltage required by the unit!
The mains connection of the ULTRACOUSTIC is made by using the enclosed mains cable and a standard IEC
receptacle. It meets all of the international safety certification requirements.
+ Please make sure that all units have a proper ground connection. For your own safety, never
remove or disable the ground conductor of the unit or of the AC power cable.
The MIDI connection (IN) is made with standardized DIN plug-in connectors. An optocoupler has been used for
isolated data communications.
You will find additional information in chapter 3 “INSTALLATION”.
1. INTRODUCTION