ETF software now has a performance enhancement package that provides the ETF user with capability not found elsewhere at any price.

This gives ETF users unprecedented resolution for finding individual low frequency room modes without using simulation packages, the ability to measure frequency response using a more psychoacoustically accurate model than conventional frequency response measurements for EQ setting and the ability to measure multi tone distortion using 16 computer optimized frequencies for a more accurate respresentation of real music and for wide band distortion measurement of loudspeakers.

This complete package is $149.95 USD as an add on or any of the three individual add ons can be purchased for $75.00.

Full documentation with measurement result examples can be found in the demo help files under Performance Enhancement Add Ons.

The PSD / Sweep add on provides the user with the low frequency room measurement power to see the room response in terms of individual room modes rather than an approximation, such as found in other analyzers.

This gives the user an unprecedented resolution in diagnosing room problems as well as evaluating the effectiveness of room treatment or modification for a specific resonant frequency. This is acheived by using a sweep test signal that shapes itself to the particular background noise in the given environment.

It has long been known by professional sound installers that setting frequency response with an EQ and RTA results in a system that does not sound correct to the trained or experienced ear. The reason for this is that human ears work differently than spectrum analyzers. Adjusting a system for perfection as measured on a spectrum analyzer does not result in a system that sounds "flat", as it should.

ETF provides a psychological model of the human hearing system that more closely approximates what is actually heard, giving inexperienced listeners the capability of measuring their systems more accurately. It gives professional users speed and precision in making these adjustments.

Two tone distortion measurements are commonplace amoung distortion analyzers and provide a convenient and standardized way of measureing THD, IMD and total distortion. Two problems that exist when using two tone measurements for loudspeakers exist. The first is that it cannot be used as a wide band distortion measurement due to the fact that high performance loudspeakers consist of multiple drivers rather than just one.

The second is that the two tone excitation is a not a reasonable representation of actual music. The multi tone measurement uses 16 individual computer optimized tones that span the entire human hearing frequency range and provide a test signal that is a better approximation to real music. ETF also provides a statistical test that allows the user to determine the accuracy of the measurement in the presence of background noise that is typical of non laboratory settings.