Model C311-ET5 Specification

2-Octave / 5-tone equal-tempered scale

No. of Notes: 11

Dimensions: W: 30 x D: 14" x H:14-1/2"

Weight: 14.5lbs.

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Scale Technical Definition: 5-Tone Equal

• Octave determination: 5th root of 2 = a factor of 1.14869835

• Number of notes per octave = 5

• Number of cents per octave = 1200

• Number of cents between notes = 240 (1200/5)

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Scale Character

5-Tone Equal has notes that relate to 12-Tone Equal.  Scale character can be heard when two note intervals with x no. of notes in between.

 Model C311-ET7 Specification

2-Octave / 7-tone equal-tempered scale

No. of Notes: 15

Dimensions: W: 40" x D: 14" x H: 14-1/2"

Weight: 18.5lbs.

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Scale Technical Definition: 7-Tone Equal

• Octave determination: 7th root of 2 = a factor of  1.1040895

• Number of notes per octave = 7

• Number of cents per octave = 1200

• Number of cents between notes = 171.43 (1200/7)

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Scale Character

7-Tone Equal has no notes that relate to 12-Tone Equal. Scale character can be heard when two note intervals with x no. of notes in between. 

Model C317-ET8 Specification

2-Octave / 8-tone equal-tempered scale

No. of Notes: 17

Dimensions: W: 44-1/2" x D: 14" x H: 14-1/2"

Weight: 19.5lbs.

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Scale Technical Definition: 8-Tone Equal

• Octave determination: 8th root of 2 = a factor of  1.090507733

• Number of notes per octave = 8

• Number of cents per octave = 1200

• Number of cents between notes = 150 (1200/8)

Scale Character

The 8-tone equal is based on the 12-tone equal's minor 3rds or diminished scale which consists of four tones: C, D#, F#, and A or notes 1, 3, 5, and 7 (as shown in the photo above).  If we move up one step and only play notes 2, 4, 6, and 8, then the second diminished scale is revealed.  Both scales are demonstrated in the audio example -->.

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When the 1, 3, 5, 7 and 2, 4, 6, 8 notes are combined in their numerical order as 1, 2, 3, 4, 5, 6, 7, 8, then the half-diminished equal scale is more easily understood as demonstrated in the first audio example above.

Model C319-ET9 Specification

2-Octave / 9-tone equal-tempered scale

No. of Notes: 19

Dimensions: W: 49-1/4" x D: 14" x H: 14-1/2"

Weight: 19.5lbs.

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Scale Technical Definition: 9-Tone Equal

• Octave determination: 9th root of 2 = a factor of  1.08005974

• Number of notes per octave = 9

• Number of cents per octave = 1200

• Number of cents between notes = 133.333333 (1200/9)

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Scale Character

The 9-tone equal is based on the 12-tone equal's major 3rds or augmented scale which consists of three tones: C, E, and G# or notes 1-4-7 (as shown in the photo above). This would be considered the first 3rd. 

Second 3rd: If we move up one step and only play notes 2, 5, 8, then the second augmented scale is revealed. 

Third 3rd: Finally, if we move up one more step and only play notes 3, 6, 9, then the third augmented scale is revealed. 

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The top audio example is how the 9-tone scale sounds when these three groups are combined.

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The two audio examples on the bottom provide the flavor of a two-note interval - one in the high octave, one in the low octave.

43-Tone Equal Tempered