Time Alignment - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums

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post #1 of 3 (permalink) Old 11-05-2014, 07:04 PM Thread Starter
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Time Alignment

Just recently I decided to play around with the time alignment feature on my Kenwood radio (KDC-BT952HD). Front Kenwood components amped with 40watts RMS per channel, rear 2-way coaxials powered by the HU (non-monsoon setup, tweeters in the a-pillars near the side-defog vents).

Starting with the preset for Front, the default didn't really make sense (Front at 0FT, Rear at 0.85FT, Subs at 0FT). Seemed to make the phase issue a little more noticeable (not sure why I even have one to begin with since all the wires are connected in the same polarity, nothing is reversed, yet some of the mid-bass frequencies cancel each other out making it somewhat unpleasant at times).

I then decided to set the front at 1.38FT (leaving the rear at the default .85FT and subwoofer at default 0FT). Right off the bat, the sound seemed more alive and realistic, as I no longer hear phase cancellation on the main speakers. I then tried the same trick with the subwoofer (set that to 5.45FT since that seems about right when measuring the actual distance from the rear to the front seat). After that, the sub impact seems to be felt more "at the same time" as the main speakers with no phase interruption (before it seemed like the bass is "felt" a little after being "heard" (sounding a little better if I "reverse" the sub phase), now it seems instantaneous even with the phase set at "normal").

Overall, the sound is about the same amount of loudness but "cleaner" and "livelier".

Now my question -- has anyone else used time alignment/correction in these f-body cars and if so, just curious to know the optimal settings (I believe I am on the right track), or am I just about optimized?

Last edited by formula97; 11-05-2014 at 07:08 PM.
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post #2 of 3 (permalink) Old 12-21-2015, 04:29 PM Thread Starter
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Thread revival......a while back I realized I did this backwards, as I am NOT supposed to delay the furthest speaker (in my case, the subwoofer).

So now I set the sub at 0.and delayed all the main speakers at 2.30ft (my Kenwood uses distance instead of actual time).

Now.....I definitely feel as if the sub is "closer", as all the speakers are heard/felt at once. A phase issue I've been chasing for a while is now gone and while I've always been happy with the bass, I can now finally enjoy the rest of the system!
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post #3 of 3 (permalink) Old 11-19-2016, 01:12 PM
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Keep in mind crossover slope effects the phase of a speaker as well. Depending on TA unit you generally tell it how far each speaker is from you and it will do the math. I did that in my Tiburon with a Bit One and have an amazing sound stage. Will be doing the same in my Trans Am soon.
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