I am a bit thick but can anyone explain in plain English how to set up for good sound, ie the correct curve, and what bthe Hrz mean.

Sorry I meant to say DISPLAY

I had one of those for my stereo some years back. I only had it for the pretty jumping lights! If your system is working ok you shouldn't need to go adjusting things, unless you have partial hearing loss and need to make up for it?

Basically you adjust to how YOU like it - but if you want to be scientific you need:

1) Audio spectrum analyser.

2) Precision calibrated microphone.

3) Pink noise source.

4) 1/3rd octave graphic equaliser.

But really it's more a big PA setup technique.

Thank you

If you buy a recent model multi-channel receiver, they come with auto calibration and a mic to set it all up correctly. I don't think it would make much difference to me on stereo.

It doesn't set the frequency characteristics, only the relative volumes and delays for your specific seating location.