User manual

PRELIMINARY AND SUBJECT TO CHANGE
miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 37
6 OPTIMIZING GAIN STRUCTURE
When deploying a DSP solution in your audio system, a topic that becomes more important than with analog
equipment is gain structure. This means that the signal levels throughout the system should be set to an
optimum – high enough to maximize digital resolution and minimize noise, but not so high as to result in clipping
and distortion.
6.1 INPUT SENSITIVITY
By default the input sensitivity of the DDRC-88A is 2 VRMS on the single-ended inputs. This is the signal level
that will result in a full-scale digital signal from the input ADC (analog-to-digital convertor). For typical
components with a specified 2 VRMS output level, the default setting will work well. In some cases, higher
In same cases, a higher input sensitivity may be required, when connected to a component that produces a
lower signal level (such as a portable audio player or a phono preamp). This can be accomplished for the single-
ended inputs by adding a set of jumpers to each channel, as shown here:
The balanced connection cannot be used on any channel with the jumpers set to the 0.9 VRMS
position. Use the jumpers only if making the connection to the RCA jack.