Does anyone know where the crossovers are in the ELS system?

I'm all set with my 4.1 system at the moment and I was thinking that if the sub cross over was in the HU, I would simply flip the input on the OEM amp (move the center channel HU output to the sub channel and connect the sub output to the JBL center driver) so that the center could better keep up with the rest of my Alpine powered system.
My JBL separates are taking every ounce of power from the MRP-F300 (2 ohm = 75wts) with ZERO break up. I dropped the Pioneer shallow 8 into the deck and I'm driving it with a MRP-M500 (4 ohm = 300wts) and it is perfectly balanced.

Just hate to loose the CC, and i'm not down with hiding another amp just for that channel.

Its OK if nobody knows as I just might try it anyway (I have two centers so who cares if I toast one)

 

Nobody?

 

All processing is done in the factory amp

 

^ true on the front channels - they are full range and pretty flat. I never tested the rear, but the center and sub are crossed from the HU.

If you get a more efficient 3.5" speaker, then the stock amp can drive it better... if you want to keep it. I only use it for the navi, not music.

 

That's what I was hoping! That should enable me to move the HU center output to the sub channel.....hook my JBL center to the OEM sub output....turn the center down to -6 and see 70 or so OEM watts to the center that was meant for the sub. The JBL 3.5 sounded fine, but when I installed my amps, I took it out of the mix. I didn't even plug the OEM amp back in. I'll let you know hoe it goes! THANKS!

 

There is no cross over in the stock amp. The stock HU has a crossover / low pass filter for the sub but the fronts and rears are run full range. The mid bass drivers use their natural frequency response as their bandpass filters. The stock tweeters have a capacitor wired as a high pass filter. I'm not positive about the center channel but I'm pretty sure that it is also run full range.

From a HU output standpoint you should be able to do what you describe ^, but I've not seen anyone measure the frequency response of the stock amp's sub channel. It might be achieving it's higher power rating by only amplifying over a limited (low) frequency range. I'd also bet that the THD+N of the sub channel is higher than for the other channels at rated power.

 

The stock amp does do some stuff, but that doesn't matter here... like HP'ing the front signal over 80 out of the amp, but it will go down to 20 from the HU.

The sub channel from the HU won't go above 80 - I tested this in my 2004 with test tones. I doubt that it will get anywhere near 70 watts, either. The center is 250 or 350 and up - I cannot remember mostly because I don't use it.

OP a test tone CD will be able to tell you everything that you need to know.

 

Slightly wrong on this, there are some frequency response graphs floating around here somewhere. Using natural frequency response doesn't give any speaker the ability to act like it has been HP, LP or BP. There has also been some testing done in this forum that proves all processing is done in the amp