tweeter mounting location for 02 sierra, mm6501's

[phil65]

Im mounting mm6501's in my truck powered by a pa 250.2. Cant figure out where to put my tweeters though. I was planning on recessing them in to the covers for the side mirror bolts but there is not enough depth in the cover to recess a tweeter. So now i have to look at my other options, but im not sure what they are. From what ive heard they are mounting them in the a pillar and reflecting them of the windshield, mounting them on top of the dash and reflecting them off the windshield, and mounting them in the a pillar and pointing them towards the opposite riders head or slightly in front of it. I would prefer the third option but im not sure if the tweeter can swivel that far. Just wanted your input on it since your champs, and im an amature. Also about what hight should the tweeters be at?

[pentoncm]

Technically you can mount them high or low next to the woofer.But to get them to sound good down low you would have to have extensive EQ power behind you. And there is a very slight rainbow effect, which isn't bad at all in my opinion but nevertheless, go high for simplicity. I would go A pillar and play with the angle. I would try the near tweeter pointed at the near side (left side) of the opposite headrest. Then I would point the far tweeter at the left side of the driver headrest.

[MacLeod]

Generally the A pillars are the best spot but NOT firing off the windshield. You ideally want them firing to the opposite side head rest. The tweeters are very directional and firing them right at you can cause them to beam pretty heavy and itll have the drivers side tweeter really overpowering the other one. Having them fire at the opposite head rest will have the near one off axis enough to attenuate the volume to match that of the more on axis far side tweeter.

The spot I usually seem to like best is about an inch or two above the highest point on the dash.

[decal]

Don't put them very far from your mid/woofer. They start to sound funky as hell, funky in a bad way.

[phil65]

Has anyone reversed the polarity of the tweeters when placing them away from the mids? It says something about it in the mm6501 manual. Doesn't really specify when or at what distance it should be switched... same with the sub

[arun1963]

In a car all the speakers are at different distances from you. Hence different arrival times at your ears. Your brain locks into what it hears first. Hence in most cars that are not using dsp the sound seems to centre around the speakers that are closest to you. You need time alignment to correct for this and to get your speakers in phase.

By reversing polarity you are delaying the forward wave from the driver nearer you, by a small bit. When the far mid is moving forward and throwing a sound wave at you, the near mid is moving backwards. The sound wave from the near mid is getting generated a fraction of a second after that from the far mid. By doing this you're trying to get better matched arrival times. If you don't have TA, try flipping the polarity of the near side speakers and see if it helps.

[phil65]

Great explination Arun, thanks alot! I'll give it all a try and see what happens.