An audio path is constructed to include a multi-bit sigma-delta converter
for converting an N-bit digital input to an n-bit output representing an
over-sampled, lower resolution n-bit version of the N-bit digital input;
a formatter for converting the n-bit output to an m signal output (e.g.,
as a thermometer code, a SDM format or a PWM format); an m-by-m switching
matric for receiving the m output signals and for reordering the m output
signals, m class-D drivers individual ones of which are driven by one of
the reordered m output signals for driving one of m speakers; and a
dynamic element matching (DEM) block coupled to the switching matric for
controlling the reordering of the m output signals driving the m class-D
drivers for spreading the distortion due at least to driver-speaker pair
mismatch to wide band noise. The DEM may operate to generate white noise,
or it may generate shaped (colored) noise.