Using the DAC2.1 Balanced
Once all the connections are complete, turn on the digital source. Next turn on the
DAC2.1 Balanced by using the rocker switch located on the back panel above mains
inlet socket. The red led on the front panel confirms that the unit is on.
The DAC will improve over time and will start to sound increasingly well balanced.
This is because of the “bedding in” time taken by new electrical components inside
the unit. Also, the DAC’s sound quality improves as the unit reaches its normal, stable
operating temperature. Only a rear panel on/off switch is provided as the unit is
designed for continuous operation. The DAC need not be switched off each time after
use. It is interesting to note that continuous operation not only results in optimum
sonic performance (since the unit is maintaining a constant operating temperature) but
also causes less electrical stress and so extends component and valve life.
All our DACs have been designed to run into impedances of 100kOhms or greater.
Many preamplifiers both active and passive have low input impedances. We do not
recommend less than 50kOhms as this causes problems with bass roll off. If you are
in any doubt consult your dealer. Audio Note offer a modification to customers who
own pre-amplifiers with a low input impedance, which is fully refundable if at any
time an Audio Note pre-amplifier is purchased as a replacement.
Cleaning
Cleaning the DAC2.1 Balanced is best done with a soft brush - some photographic
stores are able to provide suitable brushes. Alternatively, a soft cotton cloth may be
used with a mild propriety cleaner for removing dirt build-up. Strong or alcohol based
solvents may damage the finish of this product. Ensure the DAC is switched off and
cold when cleaning. Do not wet the unit.
Replacing and Upgrading the Valves
Replacement NOS valves can be purchased from Audio Note when valves fail or
should you wish to experiment with different types of valves. A list of valves and
equivalents can be found at www.audionote.co.uk. Contact your dealer if you are
unsure what valves you should use or how to install them.
Line stage valves should provide you with 5 years of continuous operation, rectifier
valves should last much longer.