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4 O
G
PTIMIZING
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.
The miniDSP 2x4 and kit board include a jumper to select their input sensitivity, allowing them to be used in a
wider variety of systems.
When purchased, the miniDSP 2x4 is provided in either "A" (0.9 VRMS maximum input level) or "B" (2.0 VRMS
maximum input level) versions, but it can be converted between them by opening the case and moving two
jumpers.
A (0.9 V) position
The maximum input signal voltage allowed before clipping the A/D convertor is 0.9 Volts RMS.
This position is typically used when the miniDSP is connected between a preamp and a power
amplifier or power amplifiers.
B (2.0 V) position
The maximum input signal voltage allowed before clipping the A/D convertor is 2.0 Volts RMS.
This position is typically used when the miniDSP is connected directly to a source without
volume control, such as a CD player.
Note that the input sensitivity jumper setting does not affect the maximum output signal – it is always 0.9 V
RMS. Therefore, when the jumper is in the 2.0 V position, the miniDSP (without any other processing enabled)
has an approximately 7 dB insertion loss. If higher output signal levels are required, then the
2x4
or the
4x10 Hd
can be used.
For more information on gain structure, see the app note
miniDSP Ltd, Hong Kong /
www.minidsp.com
S
AIN
TRUCTURE
/ Features and specifications subject to change without prior notice
Gain Structure
101.
miniDSP Balanced
38
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