Quote:
Originally Posted by DanDan  Dange, thanks again. So that, with the changing frequency, pretty much confirms that it is a floor reflection which is causing this dip, do you agree?
Sure an Impulse Response or ETC graph would confirm this, but it is hard to doubt a tape measure and calculator.
DD |
There is another possiblity. Is it known if the test was carried out with one loudspeaker or both in the stereo pair? If it was both loudspeakers a similar combing effect would be observed, not necessarily at the same frequencies, but it's possible that the path lengths are similar.
So if it is seen with just one loudspeaker, then it seems to point more to a floor reflection.
The impulse response and the frequency response are basically two ends of the same thing. This problem neatly shows how. In the time domain you have signals arriving at different points in time, due to wave interference effects this results in filtering in the frequency domain. Simples
When looking at the impulse response, the accuracy of arrival times measured by software needs to be taken into account, as we are talking milli seconds