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Old 10-10-2013, 11:55 AM   #1
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Why not use LC8i LOC? ...for stock HU w/Amp Configuration

So for those wanting to keep the stock appearance and have the factory Alpine or Infinity amp, why do people use the 6 channel Audio Control LC6i or LC7i? Not something with 8 channels like the LC8i?

So the fty amp has output channels for the front woofers, soundbar speakers, and rear subwoofer coming out of the white output harness. The tweeters run out of the black input harness (why this is, I'm not sure.) This is 8 channels when including the tweeters.

I'll guess the soundbar channels are full range and the sub channels use a low pass crossover. Does anyone know for sure if the front woofers are full range? ...or do they filter out the high frequencies going to the tweeters? If they're full range the LC6i or LC7i makes sense as there's no need to tap into the factory tweeter channels. Otherwise I would think the LC8i would be necessary so both front woofer and tweeter channels can be tapped into, then summed into 1 output channel.

FYI, I've searched 100's (well maybe 25 +/-) threads on this. Some really good writeups but nobody seems to know about the crossover frequency set up on the factory amps. Seems like those who really care about an awesome system will upgrade the HU. I like to leave my Jeep open in sketchy areas so this is not an option.

Thanks in Advance.

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Old 10-10-2013, 02:14 PM   #2
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The soundbar channels are not full range. The "seem" to be crossed over somewhere around 100 hz on a 6db slope. They are also quieter than the fronts, as if the gain is turned down on them.

The fronts are full ranger speakers....and sounded much brighter when I put full range speakers in them.

I want to say the sub is crossed over at 60hz. I had emailed Jeep about some info, and for some reason, that number is sticking in my head, but I can't find the email.

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Old 10-10-2013, 02:31 PM   #3
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Originally Posted by panthermark View Post
The soundbar channels are not full range. The "seem" to be crossed over somewhere around 100 hz on a 6db slope. They are also quieter than the fronts, as if the gain is turned down on them. The fronts are full ranger speakers....and sounded much brighter when I put full range speakers in them. I want to say the sub is crossed over at 60hz. I had emailed Jeep about some info, and for some reason, that number is sticking in my head, but I can't find the email.
. It is likely that the sub is crossed over closer to 90-100 hz since the woofer itself isn't really capable of much under 50hz. I think you are right, the lower front speakers are full range. There is no crossover between the front mid/woof and tweeter. The tweeters have high pass filters on them. The sound bar is a bit of a mystery. Like you said, maybe around 100-120hz but volume is highly attenuated. Of course this was before I ripped it all out.

If you MUST keep the stock HU (which I wouldn't do) then you should use an LCi 8 so that you are summing all 8 channels including tweeters and both sub channels.
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Old 10-10-2013, 08:35 PM   #4
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.
If you MUST keep the stock HU (which I wouldn't do) then you should use an LCi 8 so that you are summing all 8 channels including tweeters and both sub channels.
Thanks. I was thinking that summing all channels maybe an acceptable worst case if I don't get acceptable results.

I think I may entertain an aftermarket HU as well.
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Old 10-10-2013, 08:49 PM   #5
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Originally Posted by panthermark View Post
The soundbar channels are not full range. The "seem" to be crossed over somewhere around 100 hz on a 6db slope. They are also quieter than the fronts, as if the gain is turned down on them.

The fronts are full ranger speakers....and sounded much brighter when I put full range speakers in them.

I want to say the sub is crossed over at 60hz. I had emailed Jeep about some info, and for some reason, that number is sticking in my head, but I can't find the email.
Interesting about the soundbar not being full range. This would make it impossible to get a full range signal to the rear channel without summing with the fronts. Baaahaha, whatever. I'll think about this and maybe pull the trigger on a new HU.

Hey you're on the Triumph Rat boards. I use it on occasion, mostly to reference the technical docs. I've got a Thruxton I rarely ride, but I like it too much to ever get rid of it.
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