If an audio signal is to pass through a linear system without distortion due to phase effects, then the phase response (i.e. the difference between the phase of output and input) must be proportional to frequency. This simply means that all components in a complex wave form must be delayed by the same amount of time. If phase distortion is present, then different components of the wave form are delayed by differing times, and the result is to change the shape of the wave form both for complex tones and for transients. This causes a loss of accuracy in depth perception in the reproduced sound, making it impossible to place the source of an instrument in three dimensions.
Why is accurate phase performance important? Have you ever tried to tape record a conservation in a room full of talking people? While you are there, you can hear every word, but when you play the recording back there is so much background noise and other conversations you can't make out a thing. What happened is that your 2 ears heard the persons conversation with all the phase delay information perfectly, were able to position them and the sound source in space and disregard the others. The tape recorder captured them all without preserving the phase relationships and thus the direction and distance of the sound sources.
Our amplifier takes this into account and using a different approach, produces a spotlessly clean sound with remarkable detail. As a result of this attention to phase control, dc coupling and bandwidth, a listener is able to perceive depth in front of, and behind the speaker system, as apposed to conventional left-right stereo. Two leading hi-fi dealers have remarked that the amplifier sounds at least as good as the best "top of the line" models costing tens of thousands of Rands. One of the amplifier's most remarkable features is the way it looks, but it's more than a pretty face. If you would like to hear one, contact Graham at (cell) +27 (0) 82-419-1334 or email me right now. The colours of the casing are anodized, and you can select one or more to match your decor.
The big surprise is the price, (which varies with exchange rate and features of course), but is around US$1500.
The specifications below show only the levels of distortion we have been able to measure on an HP Spectrum Analyser with a dynamic range of 60dB (0.1%) The TID products are unmeasurable on this instrument and so they are shown here as <0.1% until we can make lower level measurements. When comparing other amplifiers, remember very low THD claims may point to shocking (and usually unquoted) transient performance.
These measured specifications are very conservative, and if anything, are probably better than quoted. I have been listening to this amplifier for over 10 years and it never ceases to impress me with it's clean and crisp sound.