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Overview
Thank you very much for choosing the Ack!Industries dAck!. The dAck! is a self-
contained digital-to-analog converter intended for use with high-fidelity audio systems. It takes
as input a digital signal compliant with the S/PDIF standard and generates high quality two-
channel analog signals for use into a preamplifier or integrated amplifier. This D-to-A converter
utilizes the filterless concept devised by Ryohei Kusunoki (MJ Magazine, 1996-7) to provide
focused and cohesive, yet dynamic, sound that embodies many of the features inherent in analog
music reproduction. dAck! is designed to be compatible with a very wide variety of systems,
and its primary design goal is to provide long-term satisfaction to the end user.
Please study this manual carefully before using your dAck!. We ask that you pay special
attention to the important battery usage information on page 3. Understanding this information
will ensure that your dAck! delivers its full potential for the duration of your ownership.
Preparation for use
dAck! should be carefully removed from the packaging. Make sure that both of the
following parts are accounted for: 1) dAck! chassis, and 2) Battery charger. The charger
requires minor assembly before it can be used. Please refer to Appendix A for instructions on
how to prepare the charger for use.
Place the unit on a stable support surface in a location where it will not be knocked over.
As with any high-fidelity equipment, a good support surface may improve its performance by
isolating it from external vibrations. Do not place any equipment or small items on top of the
dAck!
Instruction Manual
Rev. 1.3
1
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Summary of Contents for Ack!Industries dAck!
- Page 1 Rev. 1.3 Overview Thank you very much for choosing the Ack!Industries dAck!. The dAck! is a self- contained digital-to-analog converter intended for use with high-fidelity audio systems. It takes as input a digital signal compliant with the S/PDIF standard and generates high quality two- channel analog signals for use into a preamplifier or integrated amplifier.
- Page 2 dAck!’s vent holes. If you would like to prevent dust from entering the chassis, it is OK to cover the unit with a light cloth when not in use. Familiarize yourself with the dAck!’s inputs, outputs, and controls. The following figures show the important features and their purposes.
- Page 3 the unit fails to latch when first turned on, quickly cycling power on the unit may yield the latch condition. The dAck! will sound great as soon as it is turned on. However, allowing a few minutes for the circuit to stabilize will result in best performance. Since the circuit does not run hot, the only major break-in will be in forming and conditioning capacitor dielectrics.
- Page 4 dAck! ships for use in the horizontal position. By default, the power switch actuates in an up-and-down direction relative to a horizontally-oriented chassis. The unit is also configurable as a space-saving vertical tower with a small footprint. If this is the preferred configuration, the power switch can be rotated counter-clockwise by 90°...
- Page 5 Technical specifications The Ack!Industries dAck! is a high-performance digital to analog converter. It utilizes a Cirrus Logic receiver chip to interpret S/PDIF signals for D-to-A conversion using the Philips TDA1545 continuous calibration DAC chip. The DAC chip output is converted to analog voltage signals using high-precision FET-input operational amplifiers from Analog Devices biased into class-A operation for high linearity and low output impedance.
- Page 6 In the event of service need, the customer is responsible for transport costs to and from factory, and assuring safeguards such as adequate packaging and insurance provisions. All questions and concerns should be directed to Ack!Industries WWW: http://ack.dhs.org...
- Page 7 If a red indicator illuminates and you cannot determine the cause of the problem, please contact Ack!Industries for help. † Technical note: When the indicator switches from yellow to green, the cells are not 100% charged. In actuality, the charger switches to float status at about 90% capacity and gradually ramps the cells to 100% over a long period of time.
- Page 8 The key to battery longevity is to keep the indicator green most of the time, which means remembering to turn the dAck! off when not in use. Happy listening! All questions and concerns should be directed to Ack!Industries WWW: http://ack.dhs.org E-mail: ack@penelope.dhs.org...
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