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Unread 08-09-2014, 01:14 PM   #1
MitchSKP
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2011 JK Wrangler 
 
Join Date: Aug 2013
Location: Calgary, AB
Posts: 4
Use speakers through Infinity Amp or just off HU?

I am looking into a new HU, and was wondering whether it was a good idea to bypass the infinity amp entirely and just power speakers off of the HU, or continue using the Infinity Amp? The HU in question is the Kenwood Excelon DNX891HD (22 watts RMS/50 peak x 4 channels, 6-channel preamp outputs (5-volt front, rear, subwoofer)). What would be the best course of action?

I think I should add, I replaced the front speakers with the Infinity Kappa 60.11CS 6-3/4" component speaker system.

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Unread 08-09-2014, 02:00 PM   #2
Demp
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2013 JK Wrangler 
 
Join Date: Apr 2010
Location: Mobile, AL
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Bypass. The amp is canbus driven in collaboration with the factory headunit. It has only line left and right input and no gain control either.

Your only loss will be the factory sub. By default it is a Dual 2ohm but I don't know the power handling, can't be much.
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Unread 08-09-2014, 07:48 PM   #3
MitchSKP
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Location: Calgary, AB
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Quote:
Originally Posted by Demp View Post
Bypass. The amp is canbus driven in collaboration with the factory headunit. It has only line left and right input and no gain control either.

Your only loss will be the factory sub. By default it is a Dual 2ohm but I don't know the power handling, can't be much.
Is there anyway to retain the factory sub without spending big bucks on an amp?
If I am right doesn't it have 6 outputs? 2 could be used for the component speakers, one on each side, two for the soundbar, and the other two for sub?

Last edited by MitchSKP; 08-09-2014 at 08:53 PM..
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Unread 08-09-2014, 08:53 PM   #4
MitchSKP
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2011 JK Wrangler 
 
Join Date: Aug 2013
Location: Calgary, AB
Posts: 4
Quote:
Originally Posted by Demp View Post
Bypass. The amp is canbus driven in collaboration with the factory headunit. It has only line left and right input and no gain control either.

Your only loss will be the factory sub. By default it is a Dual 2ohm but I don't know the power handling, can't be much.
Should I also be worried about the Ohm output of the HU?
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Unread 08-10-2014, 08:33 PM   #5
Demp
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2013 JK Wrangler 
 
Join Date: Apr 2010
Location: Mobile, AL
Posts: 1,212
Every car audio headunit I've worked with supports 4 and 8ohm with no problem. Very few work at 2ohm safely and won't put out enough power for a sub, most modern units being around 15w RMS.

The issue still stands with the factory amp: It is not a traditional amp, more of a processor. The factory amp is the fade, balance, volume, and EQ of the factory unit. It has a simple left and right input and uses feedback from the factory radio to work. If it would produce any results, I couldn't begin to guess what it may be. I didn't check the voltage level of the inputs when I did my replacement, and a headunit may overpower it quickly.

I haven't messed with it, but some people have had luck with small aftermarket amps and Line Out Converters (LOC) from the rear channels. You may have some luck searching the Electrical subforum.

For reference: The factory system is actually 8 channel output. Fronts, dash tweeters, rears, sub (DVC).
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