Shown below is a representative speaker frequency response characteristic showing the magnitude of the speaker output response as a function of the speaker input frequency. A similar graph can be generated to show the phase shift of the speaker output response, relative to the speaker input, as a function of the speaker input frequency. Taken together, the frequency response magnitude and phase characteristics completely determine the so-called impedance of the speaker, and further completely define its tonal characteristics.
Obviously, speaker frequency response characteristics can vary widely across different makes and models of speakers. Less obvious is the fact that speaker response characteristics can vary considerably even across identical make / model speakers due to component manufacturing variations, manufacturing assembly tolerances, differences in aging and in-service deterioration, and a host of other reasons. Practically speaking, no two speakers - even identical make / model speakers - ever have perfectly identical frequency response characteristics or tonal characteristics, and in this case the parallel and series interconnections of the speakers will also have different frequency response and tonal characteristics. This difference can be characterized by the so-called Virtual Impedance concept discovered, patented, and developed by ToneDoctor.
Our Deuce product line exploit our discovery of the inherent differences is speaker frequency response characteristics and associated virtual impedance to allow you to readily switch between four distinct tonalities and feels in your speaker cabinet or combo, with absolutely no degration of your signal path or the purity of your tone. Cool, no?
