Chapter 13 — A report to Tom

End-Fired vs. SH50. Eight elements. Colours touched for equal loudness.

A short, purely visual report. From 400 Hz down, this should work — even to 80 Hz. The delays that make it behave are included.

Sebastián Rivas Temuco · southern Chile Report for
TOM DANLEY

ReportOct 17, 2025

scroll

13Chapter

Report on End-Fired.

Left: end-fired. Right: SH50. Eight elements each. Colours adjusted so both sound relatively equal in loudness — then compared. From 400 Hz down, this should work even to 80 Hz.

Eight elements. Left column is the end-fired. Right is the SH50 — for reference. The colour scales are touched so that the two appear relatively equal in loudness; only then does the comparison become honest.

From 400 Hz down, this arrangement should work — even to 80 Hz. The delays applied are shown in the first figure.

Delays applied to the end-fired array — Fig. 01
The delays, source by source. Eight numbers — the whole "algorithm" of this arrangement.

Comparison plot 1 — Fig. 02
End-fired vs SH50 — first frequency slice.

Comparison plot 2 — Fig. 03
Second slice.

Comparison plot 3 — Fig. 04
Third slice.

Comparison plot 4 — Fig. 05
Fourth slice.

Comparison plot 5 — Fig. 06
Fifth slice.

Comparison plot 6 — Fig. 07
Sixth slice.

Comparison plot 7 — Fig. 08
Seventh slice.

Final comparison frame — Fig. 09
Final comparison frame — the two patterns seen together, once more.

· · ·