Extensive, helpful Windows 95 help file ETF provides a much larger help file than most similarly priced applications. A 190 K text based help file plus 17 large color images provide clear concise explanations about the use of ETF and room acoustics in general. ETF was designed to be educational as well as useful. Notes are supplied with many of the sample files. ETF Device Designer, computer aided design of Helmholtz resonators and QRD diffusers ETF provides the DIY user to construct low cost, high quality acoustical devices with a minimum of design effort.
Parts are available from most home building suppliers around the world.
The CD based test signal excites the room and loudspeakers at all frequencies between 20Hz and 20 KHz. This provides useful insight into how the room and loudspeaker behave with all music sources. Low cost and ease of use ETF was designed so that anyone can use it. All of the complex DSP parameters have been adjusted to best illustrate room acoustics. ETF provides an easy to follow virtual screen show illustrating principles of small room acoustics and how the main application, ETF3.0 can be used to measure room and loudspeaker response.