Sound quality

[Subnet76]

I noticed that the sound on Sirius sounds louder in the 1K EQ range. Where as FM seems more of a full range. I have tried to adjust my EQ setting but just cant to get it right, even with it turned all the way down. Has anyone else noticed a difference? Could my attena placement cause this? I have it set about 3 inches closer to a window than the directions show. But my attena is on a truck roof, so the window is pretty much below the it.
:confused:

[va3ip]

I noticed that the sound on Sirius sounds louder in the 1K EQ range. Where as FM seems more of a full range. I have tried to adjust my EQ setting but just cant to get it right, even with it turned all the way down. Has anyone else noticed a difference? Could my attena placement cause this? I have it set about 3 inches closer to a window than the directions show. But my attena is on a truck roof, so the window is pretty much below the it.
:confused:

I am in Canada and i must confess havet noticed a specific peak in audio frequency response... however, I might be able to shed some light on what's happening:

Firstly, it's nothing to do with the antenna! the FM modulator in the sirius unit plays the most important part in what you are hearing as it takes the satellite signal and 'down-converts' it to a (selectable) FM stereo signal.

The audio spectrum (what you can hear) is usually between 100Hz and 2000KHz slightly more if you are younger - or a dog :) - The frequency response that you discern between your FM stereo and the Sirius channel is your FM radio's faithful reproduction of the transmitted signal - either from a Terrestrial FM Transmitter or the Sirius Transmitter - FM radio regularly over-deviates and produces a wider signal than what is legally permitted - you Sirius radio is showing a sharper (normal) peak than FM radio!

You say you are using a graphic equalizer - that's fine but it's purpose is to contour your playing environment (the truck's cab) to even out the frequency response/distortions that come from the speakers - nothing more!

Here's what you might want to try - take a boom-box and tune it to the Sirius and see what it sounds like compared to your truck-radio!

Next try it with a friends Sirius - should sound the same!

Conclusion: FM Broadcasters can and do create big local signals to get their sound better than the next station's!

Hope this helps?

Terry