HS066

This is a curve with a medium slow decay at beginning and a  very slow decay at the end. The area of the curve is 40.75% of the full square area (-7.8 dB FSA).

If based on area ratio (current to Linear (50%), it’s RT60 time should be 0.81 of Linear RT60.

This curve was calculated from the Hyperbolic Secant Curve Equation, applying a value of 0.666666 as constant

https://mathworld.wolfram.com/HyperbolicSecant.html

https://archive.lib.msu.edu/crcmath/math/math/h/h424.htm

MF48

Medium Fall with 48 dB per octave filters fall applied to 9 Octaves extension

It’s a general-purpose slow decay impulse, for vocals and instruments, or any electronic musical source.

The collection is divided into  44.1 kHz 24 bit, 48 kHz 24 bit and 96 kHz 24 bit folders.

Inside each folder 12 tone folders (A to Bb).

Inside each Tone folder, 8 files of direct processing plus five folders containing each one 8 files of variable Q Factor programming material.

A total of 1728 Impulse files is distributed according to the following folder structure:

Wave Naming

MF48 WND HS066 A 3  means White Noise with delay as generator, Hyperbolic Secant 0.666666 as fall curve, A as Tone and 3 seconds of Impulse length.

MF48 WND HS066 A MS 3 the same as previous but with M/S processing.

MF48 WND HS066 A 6  means White Noise with delay as generator, Hyperbolic Secant 0.666666 as fall curve, A as Tone and 6 seconds of Impulse length.

MF48 WND HS066 A Oct 6 Oct means 1 octave up.

The files on the other folders follow the same syntax meanings