How amps see impedance
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=78987
Printed Date: May 19, 2024 at 10:35 PM
Topic: How amps see impedance
Posted By: Reeceddogg
Subject: How amps see impedance
Date Posted: June 11, 2006 at 11:42 AM
I was looking a using a three sub set up on a single amp. I'm looking to acheive a 2 ohm load. Will the amp see the single impedance of each driver or the total impedance. the resistance of the subs would be 8ohm for subs one, 8 ohms for sub 2, and 4 ohms for sub 3. all the same brand and model.
Replies:
Posted By: Steven Kephart
Date Posted: June 11, 2006 at 11:54 AM
How can they be the same model but be a different impedance? Usually a manufacturer will change the model number slightly to indicate the impedance difference. The amplifier will see the total impedance of the circuit. However the power distribution willl not be consistent if the impedances are in fact different. Of the total power the amplifier produces, more power will go to the lower impedance sub than each of the other two subs. This willl most likely cause it to play louder.
Posted By: Reeceddogg
Date Posted: June 11, 2006 at 12:11 PM
Not same model but series. I want to put 3 kicker L5 on a brutus bxi 1606. i was looking at 2 dual 2 ohm subs wired in series, and a dual 4 also wired in parallel. Is there anyway around the unequal power distribution? also how can i calculate how much each sub would be getting. and i was mistaken it should be a 1 ohm load.
Posted By: Steven Kephart
Date Posted: June 11, 2006 at 12:18 PM
Power will only distribute evenly if the resitances are identical. So you would need 3 subs of the same impedance. Just keep in mind that you don't HAVE to achieve the lowest impedance the amplifier can safely handle. Going with a 4 ohm load instead of a 2 ohm load for instance is only about a 3 dB difference in output.
Posted By: Reeceddogg
Date Posted: June 11, 2006 at 12:21 PM
do you know of any 3 sub set that i can use. I already have this amp.
Posted By: forbidden
Date Posted: June 11, 2006 at 12:26 PM
This is about as close as you are going to get with a 3 sub setup.So either dual 4 ohm subs wired in a series / parallel circuit or 3 8 ohm subs wired in a parallel circuit. Option 1 (parallel) = 2.67 ohm load
Speakers wired in parallel
Recommended Amplifier: Stable at 2 or 1 ohm mono |  |
------------- Top Secret, I can tell you but then my wife will kill me.
Posted By: Reeceddogg
Date Posted: June 11, 2006 at 12:38 PM
that's supposed to be a 1 ohm load. What if i did 3 dual 2 in series/parallel. thats 1.3 ohms. what calculation would i use to figure out how many watts the amp is capable of at this impedance.
Posted By: DYohn
Date Posted: June 11, 2006 at 1:07 PM
Reeceddogg wrote:
that's supposed to be a 1 ohm load. What if i did 3 dual 2 in series/parallel. thats 1.3 ohms. what calculation would i use to figure out how many watts the amp is capable of at this impedance.
What is "supposed to be a 1 ohm load"? Your amp? No, an amplifier's rating is for the minimum load it can safely handle, not a requirement of some sort. If you are referring to the graphic forbidden posted, it is correct. ------------- Support the12volt.com
Posted By: forbidden
Date Posted: June 11, 2006 at 1:39 PM
Using 3 dual 2 ohm subs can yeild a number of different loads on a amp. Look in the blue sidebar to the left of the screen for woofer wiring, that is where you will find the woofer calculator. In the case of your dual 2 ohm subs, the cloest you are going to get is this load, which may well be beyond the capabilities of the amp that you have chosen for the task (if it is only stable to 2 ohm mono for example). Here is this diagram as found in the left column. Option 1 (series/parallel) = 1.34 ohm load
Voice coils wired in series, speakers wired in parallel
Recommended Amplifier: Stable at 1 ohm mono |  |
------------- Top Secret, I can tell you but then my wife will kill me.
Posted By: Ravendarat
Date Posted: June 11, 2006 at 1:44 PM
Here is another question, what amp is this? Is it 1 ohm MONO stable or one ohm STEREO stable. Big difference here.
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double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer
Posted By: aznboi3644
Date Posted: June 11, 2006 at 2:28 PM
He said the Hifonics BXI 1606 which IS 1 ohm stable.
Specs say it puts out 1600 rms at 1 ohm.
Posted By: Reeceddogg
Date Posted: June 11, 2006 at 2:48 PM
yes that's the amp. but how do i calculat how much the amp will put out at 1.34 ohms. I was thinking of going with 3 L5 that are 4 ohm dvc.
Posted By: Ravendarat
Date Posted: June 11, 2006 at 3:02 PM
my bad, I didnt see the other post about amp model
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double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer
Posted By: DYohn
Date Posted: June 11, 2006 at 3:03 PM
Reeceddogg wrote:
yes that's the amp. but how do i calculat how much the amp will put out at 1.34 ohms. I was thinking of going with 3 L5 that are 4 ohm dvc.
3 woofers @ 4-ohm DVC will create a 2.67 or 6.0 ohm load (or 0.67.) Check your options HERE. ------------- Support the12volt.com
Posted By: Reeceddogg
Date Posted: June 11, 2006 at 3:19 PM
sorry thats 2 ohm dvc.
Posted By: Reeceddogg
Date Posted: June 11, 2006 at 3:39 PM
does anyone have a formula or can tell me how much power it will put out at 1.34 ohms.
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