4 channel amp, DVC subwoofer
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=88693
Printed Date: April 28, 2024 at 10:47 AM
Topic: 4 channel amp, DVC subwoofer
Posted By: sna66
Subject: 4 channel amp, DVC subwoofer
Date Posted: January 10, 2007 at 1:13 AM
Hi all, I always do my own installs, but this one has me a bit stumped.. this is my personal installation, its a 2003 350z, I'm using one amp a kenwood 4 channel KAC-8402 (60w X4) and only 3 speakers (not a competition system) i have 2 alpine full range 6.5" up front and an alpine 10" type r sub in the hatch. the 2 front channels are obviously gonna power the 6.5"s. My question is what's the best way to connect the rear channels to this sub, each voice coil is 4 ohm. I use a jvc dvd head unit that connects to a 7" lcd in the nav space option 1: connect each rear channel on the amp each voice coil independantly? option2: bridge the two rear channels on the amp and run the subs at 2 ohm? Any other options? TIA
Replies:
Posted By: ss-installer
Date Posted: January 10, 2007 at 10:01 AM
depends on what the amp will run at. if it is stable at 2ohm mono then do that.
Posted By: haemphyst
Date Posted: January 10, 2007 at 12:35 PM
That amp won't do one ohm per channel, which is the same as bridging it into a 2 ohm load. Your ONLY remaining choice, therefore, is your "Option 1" - running one channel to each voice coil, for a total of 120 watts RMS to the sub.
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Posted By: sna66
Date Posted: January 10, 2007 at 1:05 PM
thanks for the advice haemphyst thats the answer i was looking for
Posted By: sna66
Date Posted: January 10, 2007 at 2:27 PM
just wondering though, each voice coil is 4 ohms, if i run it in parallel, won't the load be 2ohms??
Posted By: geepherder
Date Posted: January 10, 2007 at 6:36 PM
Yes, wired in parallel, the voice coils would present a 2 ohm load. What Dave was getting at is the fact that 2 ohms bridged mono is for all practical purposes identical to 1 ohm stereo (per channel). This is because the load is shared between both channels when you bridge. So bridging your amp to a 2 ohm load is the same as connecting one ohm per channel.
Your other option would be to connect the voice coils in series, and bridge the amp (8 ohms). This again is essentially the same thing as connecting one voice coil per channel.
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My ex once told me I have a perfect face for radio.
Posted By: stevdart
Date Posted: January 10, 2007 at 7:05 PM
geepherder wrote:
Your other option would be to connect the voice coils in series, and bridge the amp (8 ohms). This again is essentially the same thing as connecting one voice coil per channel.
...and is the option I would tend to choose. ------------- Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: forbidden
Date Posted: January 10, 2007 at 11:53 PM
Hmmmm, type R sub is what 500w rms......dual coils.....250 each......amp bridged to 4 ohm mono should be in what the 200-260w rms into 4 ohm range.....one could always only use 1 voice coil on the sub. Might be something to try.
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