front stage: in the roof facing down?

[keep_hope_alive Premium Member]

whether or not you want to compete in SQ or even want to have a sound stage - what we all want is good sound. even the best speakers can sound bad if phase interference is not controlled. we want to minimize multiple arrival times. when several drivers are in a line and playing the same content, we get comb filtering based on the spacing and distances involved. with comb filtering, each location sounds a bit different since phase interference will shift according to the varying distances involved.

as far as speakers overhead - i'd want one in each corner firing toward the middle of the vehicle floor. getting proper airspace and a solid enclosure would be equally important. a line of speakers in the overhead will suffer from multiple arrival times and there woudn't be enough of them to perform like an actual line array. that's not to say it can't sound good in some locations. there are too many variables to generalize upon, but but the math can be done to predict where phase interference will occur, then maybe crossover points can avoid some of that.

 

[keep_hope_alive Premium Member]

for imaging, we are concerned about PLD and ITD below 4kHz and IID above 4kHz. you can easily attenuate tweeters in level so that they blend with the midrange. the real trick is getting enough power to a midrange to attain the desired output.

 

[Moble Enclosurs 10+ year member]

for imaging, we are concerned about PLD and ITD below 4kHz and IID above 4kHz. you can easily attenuate tweeters in level so that they blend with the midrange. the real trick is getting enough power to a midrange to attain the desired output.

I think it will help if I redid my mids for direct propagation, such as kick panels. I want ITD as close to 0 as possible. I just want to be able to localize the signal from the reflection as mentioned for now, but in order to do that completely, I may need to rearrange the mids just for that. Then can configure the postitioning more precisely (azimuth) for the tweeters before I figure the correct propagations in relation to the mids. The problem now, is that each reflection will have its own variables that will affect the other reflections, such as the mentioned side window reflection to the listening position, but if you consider a parabolic type effect of the directivity, i believe this is highly possible to obtain control of the natural reproduction. If I can direct the reflections to a single point on the dash(as close as possible) each one will arrive (as close as possible) to the averaged listening point more so than worrying about scattered reflections. There will be of course differences in the paths still, but more controlled and considering I sit 5 different ways in my seat, I think this is plausible. But coming from a dome tweeter with half space resonance from 1 inch diameter, the waves should be somewhat close if the diffuser is close to the dome.

Just some thoughts for now.

 

[The_Grimy_One 10+ year member]

Keep_Hope_Alive drops knowledge... Just saying.

 

[keep_hope_alive Premium Member]

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Thanks. I like sharing knowledge. And this stuff is what I'm most interested in.