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two channel amp three speakers


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threebean 
Member - Posts: 4
Member spacespace
Joined: August 23, 2011
Location: Iowa, United States
Posted: August 23, 2011 at 12:10 PM / IP Logged  
Hi,
Many years ago I had a setup for the rear of my car that consisted of 2 16x9s in the post and a single sub in the hatch. It was powered by a single 2 channel amp using a 1 choke and 2 caps to filter the frequencies to the correct speakers.
For the life of me I cannot remember the exact wiring of this setup. I have a graphic of how i think is how it was setup. Will this work or short the whole thing out?
I know this is not the best setup, but back in the day it worked and sounded pretty good.
two channel amp three speakers -- posted image.
threebean 
Member - Posts: 4
Member spacespace
Joined: August 23, 2011
Location: Iowa, United States
Posted: August 23, 2011 at 12:15 PM / IP Logged  
The setup back then was 16x9s with a 10" single voice coil sub if that makes any difference.
DYohn 
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Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: April 22, 2003
Location: Arizona, United States
Posted: August 23, 2011 at 12:21 PM / IP Logged  
That's not a standard tri-mode setup.  In tri-mode the sub (or woofer) is connected as a bridged load, not between the two positives (which will generate a signal, but only the difference between the stereo sides.  This is commonly used to wire a full-range speaker as a center channel on amps that can handle it.)  If your amp is bridgeable (or if it is called "Tri-mode capable") use a woofer with a high enough impedance and bridge it (generally left positive and right negative.)  Use a simnple first-order crossover as you have depicted and make sure you match the knee frequency for both high and low pass.
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threebean 
Member - Posts: 4
Member spacespace
Joined: August 23, 2011
Location: Iowa, United States
Posted: August 23, 2011 at 1:44 PM / IP Logged  
Thank you for your reply. I will go look that up.
threebean 
Member - Posts: 4
Member spacespace
Joined: August 23, 2011
Location: Iowa, United States
Posted: August 23, 2011 at 3:42 PM / IP Logged  
I adjusted my illustration to be a tri-mode one. This must be how it was setup. When I bought the amp I had the 16x9s and was given the sub. So I told him what I had and what I could spend and went home with an amp, two caps, and a choke.
two channel amp three speakers -- posted image.

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