Congratulations and thank you for your purchase of the ADB2 Active Direct Box. The ADB2 is intended for sending unbalanced signals (up to +40 dB) to a mixing console or other professional input device. The unit has no transformer, so stray field pickup is nonexistent. The ADB2 is powered by standard microphone phantom power from 9 - 48 VDC and uses discrete low-noise differential drivers to make it very quiet. The unit has two 1/4" input jacks wired in parallel, a male XLR output jack, a ground lift switch,

and a three-position attenuator switch.

DESCRIPTION

INPUTS: Two 1/4" unbalanced jacks - wired together in parallel. For connection to line or instrument level signals.

OUTPUT: One male XLR jack for connection to mixing console or other input device carrying phantom power.

ATTENUATOR SWITCH: Decreases the input signal by the indicated amount. At 0 dB the signal is not attenuated, at the 20 and 40 dB settings, the signal is dropped by that amount.

GROUND LIFT: Removes the ground connection of the 1/4" and XLR jacks from the chassis ground.

ACTIVE LED: Indicates the unit is receiving phantom power.

INSTALLATION

In order for the ADB2 to function it must be connected to a microphone phantom power source with a balanced XLR cord. The input may be anything from a speaker source such as a music amplifier, VCR or projector, to an instrument such as a guitar or High-impedance microphone. Care should be taken to overdrive the ADB2 or there will be a distorted sound from the unit. Use the lowest attenuator setting that gives distortion free sound. The ground lift switch should be in the position that yields the lowest noise.

ADB2

Active Direct Box

SPECIFICATIONS

 

Input Level:

-10 to +40 dB unbalanced

Output Level:

-10 to +2 dB balanced XLR Male (pin 2 +)

Bandwidth:

1 Hz to 50 kHz

S/N Ratio:

100 dB

WARRANTY

For information on the Rolls One Year Limited Warranty, and to reg- ister this product, visit our website

at www.rolls.com

ADB2 Active Direct Box

•Uses standard 9 - 48 volt phantom power for supply

•Ground Lift for "hum" reduction

•Attenuator switch for connection to line level or speaker level signals

The ADB2 is an active direct box for convert- ing a high impedance signal such as a direct out from a bass amplifier, to a low imped- ance signal such as a snake input and a mixer's microphone input. The Ground Lift is provided to reduce possible ground hum or buzz.

Rolls Corporation Salt Lake City, UT 3/01

Jacks:

(2) 1/4" phone, (1) XLR male

Controls:

Attenuator switch, Ground Lift switch,

Power:

9 - 48 VDC Phantom Powered

Size:

2" x 3.5" x 5"

 

 

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ROLLS CORPORATION

 

 

 

 

 

 

 

 

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5968 South 350 West

 

 

 

 

 

 

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Salt Lake City, UT 84107

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PHANTOM DIRECT BOX

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Size: Ba Document Number: ADB2.SCH

Rev: A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Date: 29-Mar-2001

Sheet 1 of 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Owners Manual

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Rolls owner manual ADB2 Active Direct Box, Specifications
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ADB2 specifications

The Rolls-Royce ADB2, a standout model from the celebrated Rolls-Royce family, represents a remarkable blend of engineering excellence and innovative design. Introduced in the mid-20th century, the ADB2 particularly thrives in the realm of aviation, pushing the boundaries of what is technically achievable while ensuring unparalleled performance and reliability.

One of the key features of the Rolls-Royce ADB2 is its advanced gas turbine technology. The engine utilizes a high bypass ratio, enabling it to produce substantial thrust while operating efficiently at various speeds and altitudes. This technology not only enhances fuel efficiency, but also minimizes the noise levels typically associated with jet engines, addressing the growing demand for quieter and more environmentally friendly aviation solutions.

The ADB2 is also characterized by its lightweight materials. The use of advanced composites and alloys significantly reduces the overall weight of the engine, allowing for increased payload capacities in aircraft without compromising performance. This means airlines can optimize their operations, enhancing profitability while meeting the soaring demands of air travel.

Furthermore, the ADB2 is equipped with state-of-the-art electronic management systems. These systems provide real-time monitoring and control of engine functions, optimizing performance and ensuring safety. They also help in predictive maintenance, identifying potential issues before they become critical, reducing downtime, and extending the life of the engine.

In terms of durability, the ADB2 is engineered for a long service life, with components designed to withstand extreme conditions. This resilience is crucial for operators, as it translates into lower maintenance costs and enhanced operational uptime.

The ADB2’s versatility is another notable characteristic. It’s suitable for various aircraft types, from commercial airliners to cargo planes, highlighting its adaptability to different aviation markets. This flexibility is crucial in the ever-evolving aviation landscape, where demands change rapidly.

Overall, the Rolls-Royce ADB2 is a testament to the brand's commitment to innovation and excellence in aerospace engineering. Its combination of advanced technology, lightweight materials, and robust performance features make it a preferred choice for aircraft manufacturers and airlines around the globe. As the aviation industry continues to evolve, engines like the ADB2 will play an essential role in shaping the future of air travel, offering efficiency, safety, and sustainability in one package.
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