how to properly feed a dual coil sub
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=87622
Printed Date: April 28, 2024 at 6:26 AM
Topic: how to properly feed a dual coil sub
Posted By: ravesrus19
Subject: how to properly feed a dual coil sub
Date Posted: December 14, 2006 at 12:48 AM
Hello Ford ranger, 2005 4 door stx My question is: I have a dual coil, 250 watt RF rms sub that i will be powered by a 250 watt rms rockford amp. Because it is dual coil, does this mean each coil will put out 125 wattsand split the draw of current? If so i will use 14g for the wiring inside the box. thnx ------------- 2005 Ford Ranger, 4 door , stx model
Replies:
Posted By: haemphyst
Date Posted: December 14, 2006 at 12:51 AM
The coils will ACCEPT UP TO 125 watts each, without any thermal damage occuring. Voice coils do not put out anything.
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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
Posted By: jlord16
Date Posted: December 14, 2006 at 8:15 AM
Yes it means each coil is rated to handle 125 watts of power (ie heat energy), depending on how the coils are wired as to wheater current is split or not. Yes 14AWG wire will be fine to run from the amp to subs.
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Posted By: haemphyst
Date Posted: December 14, 2006 at 8:33 AM
jlord16 wrote:
Yes it means each coil is rated to handle 125 watts of power (ie heat energy), depending on how the coils are wired as to wheater current is split or not. Yes 14AWG wire will be fine to run from the amp to subs.
Actually, the current is split ANYTIME both coils are used. If wired in parallel, you just need a mono amp capable of 250W at 2 ohms, and if wired in series, you need a mono amp capable of 250W at 8 ohms (close to 1000W at 2 ohms). If you have a stero amp, not capable of being bridged (the do exist...) it needs to be 125W per channel at 4 ohms. The power is still split between the two voice coils - always... ------------- It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
Posted By: ravesrus19
Date Posted: December 14, 2006 at 5:52 PM
thnx guys
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2005 Ford Ranger, 4 door , stx model
Posted By: ravesrus19
Date Posted: December 22, 2006 at 1:27 AM
ok i have a dual coil rf sub (250 watts rms) I have a 2 channel rockford amp that can push out 250 watts rms bridged, or 75 watts rms per channel. Should I: parrallel the coils together and hook them up to the amp bridged, so the sub can meet its full potential of 250 watts or hook each individual coil to a channel at 75 watts a channel. I will be hooking it up the first method, unless there is some reason not to. thnx ------------- 2005 Ford Ranger, 4 door , stx model
Posted By: dfizzle
Date Posted: December 22, 2006 at 2:07 AM
As long as your ohm loads are correct. If your amp pushes 250W RMS x 1 at 2 ohms (which I'm guessing is the case) then as long as your sub has dual 4 ohm voice coils and will therefore present a 2 ohm load when wired in parallel , then you're all set and that's the best way to go.
Posted By: haemphyst
Date Posted: December 22, 2006 at 8:14 AM
I wouldn't recommend that. Unless the DVC sub is DVC 8 ohm, you will be loading your amp to 1 ohm per channel, which RF amps won't do... You'll let the smoke out, and RF amps have enough trouble keeping it in already!
Most RF amps will only bridge into a 4 ohm load, safely. Your best bet is either 1: get another identical woofer, wire each woofer in series, then parallel them to the amp, or 2: run the amp in stereo with one amp channel running each voice coil.
::::EDIT::::
The actual output between 150 watts and 250 watts will be less than 3dB, and 3dB is largely recognized as the threshold of audible difference. What this means is that you will NOT hear the difference in output between the two connections. Put the phrase "full potential" from your vocabulary, and indeed, even your mind!
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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
Posted By: forbidden
Date Posted: December 22, 2006 at 9:32 PM
I answered this question to him on the other site that he posted for help on. Thanks for recommending the exact same thing Dave.
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Top Secret, I can tell you but then my wife will kill me.
Posted By: haemphyst
Date Posted: December 22, 2006 at 10:24 PM
I got your back, brother!  ------------- It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
Posted By: ravesrus19
Date Posted: December 23, 2006 at 5:11 AM
how bout just runnin 125watts (bridged) to an 8 ohm load?
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2005 Ford Ranger, 4 door , stx model
Posted By: aznboi3644
Date Posted: December 23, 2006 at 1:50 PM
it would work...just don't crank the gain so the amp clips
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