master the art of timing
How it works
Equalization (EQ) is regarded suspiciously in audiophile circles. And rightly so. In trying to correct the tonal balance caused by the significant frequency-response errors endemic to loudspeakers, timing (phase) delays are introduced to varying degrees for some frequencies. • Scroll to read more
Loudspeaker phase delays (timing errors) are about 100 times worse than are present in the signal driving them. Although the delays are consistent for every speaker design, correcting them has been impossible in the analogue world. Expensive engineering is usually required to minimize phase delays but even these design compromises can have undesirable effects. For example, traditional shallow crossover filters can maintain linear phase but can’t properly quarantine drivers to their ‘linear’ operating zone. This results in reduced dynamic resolution (compression) and less natural dispersion due to driver on-axis ‘beaming’.
DEQX, however, corrects existing phase delays already introduced by the loudspeaker.
The first graph (frequency response) is a low distortion speaker driver’s frequency response. This response falls within the mandatory plus/minus 3dB zone required through the mid-range frequencies for even average ‘hi-fi’ speakers.
After DEQX correction (the blue line) its frequency response has become truly accurate.
The second graph (group-delay response) shows how the speaker delays some frequencies to varying degrees. Notice that some frequency groups lag by around one millisecond (1ms), others are not so delayed and still others are even more so. After DEQX correction, all of the audio has been delayed by approximately 10ms to allow the late frequencies to catch up (the upper curve) when the signal is reassembled.
The speaker’s frequency-response and timing coherence has been restored to more precisely reflect the audio signal.