The Elements of Harmony > Quadriads (in-depth)

                                            
Quadriads: Another choice

In some instances, the Root of a Quadriad will be doubled, while the 5^th  is removed completely. Since now there are only three different elements in the chord, it no longer fits the definition of a Quadriad, and must be described as a "Seventh" chord. Note: it is not a Triad either, because the notes are not stacked in tertian intervals.

In short, all Quadriads are Seventh chords, but not all Seventh chords are Quadriads.

Figure 1 illustrates a Seventh (non-Quadriad) chord.

                            
                                                                  Figure 1 

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