tri mode

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=92167
Printed Date: July 06, 2025 at 2:13 AM

Topic: tri mode

Posted By: jmelton86
Subject: tri mode
Date Posted: March 26, 2007 at 11:00 PM

I once had a 2 ch amp hooked in tri mode to 2 KickerComp (not vr) 10's (4Ohm) on stereo and a RF P1 12(4Ohm) bridged. Seems it was louder than 2Ohm stereo. How can one estimate the approx. amount of power reaching the subs in this setup?

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2013 Kia Rio -90a alternator
DDX470HD GTO14001 GTO1014D (x3)
Big3 in 1/0G
1/0G to GTO14001

Replies:

Posted By: dwarren
Date Posted: March 26, 2007 at 11:38 PM

How did you have a 2 channel amp set to tri mode?

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Posted By: jmelton86
Date Posted: March 27, 2007 at 12:09 AM

It's easy. All you do is wire 2 4Ohm speakers stereo, and 1 4Ohm speakers bridged. Lanzar(I know) had it in the manual.

Now, Lanzar(I know), in full range, had he diagram for the 2 H/P speakers in stereo to have capacitors on them and for the sub (bridged one) to have an inductor on it.

I had a L/P signal going to the amp to begin with, so I didn't put inductors on each woofer like someone told me to(just trying to sell me 3 I guess).

All 3 woofers looked like they were all moving the same. Is it reasonable to assume the 400wrms from the amp was split by 3 or would the bridged channel be getting more power?

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2013 Kia Rio -90a alternator
DDX470HD GTO14001 GTO1014D (x3)
Big3 in 1/0G
1/0G to GTO14001

Posted By: jmelton86
Date Posted: March 27, 2007 at 4:49 AM

Oops, Lanzar(I know) Vibe241

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2013 Kia Rio -90a alternator
DDX470HD GTO14001 GTO1014D (x3)
Big3 in 1/0G
1/0G to GTO14001

Posted By: stevdart
Date Posted: March 27, 2007 at 7:54 AM

The proper crossover that you apply between the sub and the mids effectively separates the freqs to those drivers. Power, therefore, is estimated based on the wiring configuration that each driver uses. The sub is bridged across both channels, so look at the amp's output rating for the sub's 4 ohm impedance in bridged mode. The mids are wired in two channel mode.

]I had wrote:

a L/P signal going to the amp to begin with, so I didn't put inductors on each woofer like someone told me to(just trying to sell me 3 I guess).

Your tri-mode wiring scheme was incorrect. But, as all three of these were subs, the wiring was just a parallel scheme. The bridged sub received twice the power as each of the other subs (as they were all 4 ohm). See https://www.bcae1.com/trimodpd.htm

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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: jmelton86
Date Posted: March 27, 2007 at 6:53 PM

That link settled it for me. Thanks, stevdart.

-------------
2013 Kia Rio -90a alternator
DDX470HD GTO14001 GTO1014D (x3)
Big3 in 1/0G
1/0G to GTO14001