Conrad-Johnson D/A-3 Manual del usuario - Página 4

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Because the D/A-3 dissipates very little heat, ventilation is not an

important consideration, allowing greater flexibility for custom or built-in

installations. Of course, reasonable judgement must be exercised to see

that the D/A-3 does not obstruct ventilation required by amplifiers or

other equipment in the system. The unit may be mounted either horizon-

tally or vertically.

All D/A-3s sold in the United States are configured for operation on a

60Hz ac power line producing between 108 and 126 volts. Export

versions of the D/A-3 will have the correct operating voltage and fre-

quency clearly marked on the back panel of the unit, near the ac power

cord. In all cases, the actual line voltage should be within + 5/- 10% of

the nominal rated voltage.

Electromagnetic Interference (EMI)

Considerable care has been taken in the design of the D/A-3 to minimize

it's susceptibility to radio frequency interference and other forms of EMI.

Choice of materials, physical layout, grounding practice, and power

supply design have all been specified with a view to reducing the impact

of electromagnetic fields on the performance of this unit. At the same

time, however, our primary goal is the accurate reproduction of recorded

music in the normal home environment, and we have elected not to

compromise this objective by the application of heavy-handed RFI

filters, or by using grounding practices that reduce RFI at the expense

of degraded audio performance. We find that the approach we have

taken has worked extremely well, resulting in only rare instances of EMI

problems which could be treated locally as needed, rather than compro-

mising the performance of our product in the 99.9% of installations

where EMI is not a problem.

Care in installation can often avoid EMI induced problems. The following

practices should generally be observed in any application, and will be

especially important where EMI may be a problem.

Interconnect cables should be kept as short as possible (3 meters or

less), and shielded cable should be used (cable which has two center

conductors, and a separate external shield connected at only one end).

D/A-3 Owner's Manual