http://www.ebay.com.au/itm/350511073560?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649#ht_2770wt_1140
My main reason to buy this product is the attractive display panel, as according to description it can display the working status (audio spectrum) of the signal in either before (DIRECT) or after (EQ) equalization.
But after few experiments, I have come to a conclusion that this unit is not working as described. The audio spectrum display is not correct. The following experiments demonstrate my point.
I connect the audio output from a laptop to the DVD input of the unit as follows.
An to make sure, I set the equalization to be "flat"
Then I wrote a program on the computer to generate three purely sine wave signals at frequencies 100Hz, 200Hz, and 500Hz.
If the display panel is working properly, it should show an audio spectrum of only one peak for each case, shifting from 100Hz to 500Hz. Everywhere else should be zero or very small.
But to my surprise, regardless of what input audio signal, the spectrum pattern displayed is the same.
In the following, click on the photos for high-resolution versions of the images.
This is the display for 100Hz input signal
Next, for 200Hz input signal
And for the 500Hz input signal
As can be seen, in these three cases, the spectrum pattern is unchanged. I even videotaped the display panel when a real movie is played and the recording is available at the following YouTube website
My conclusion is that the display is not working properly. It does not show the spectrum content correctly. A good spectrum analyzer should show real audio input like this
