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wiring different ohm rated woofers

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knotdrummer88 
Copper - Posts: 162
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Posted: April 14, 2010 at 11:10 PM / IP Logged  
would i be safe wiring a 4 ohm and an 8 ohm sub together in either series or parallel? also the amp i would wanna use is stabel down to 2 ohms.
j.reed 
Copper - Posts: 716
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Posted: April 15, 2010 at 1:13 AM / IP Logged  
Its never a good idea to mix different ohm woofers. Especially if in a shared chamber. The 4ohm will be fed more power then the 8ohm sub. Simple ohms law.
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stevdart 
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Posted: April 15, 2010 at 9:02 PM / IP Logged  
To be specific to your question, yes, it is safe to do so as far as each speaker is concerned.  Use the parallel and series calcs to figure out total load on the amp.  As said prior, the speaker with the lower impedance will get the lion's share of power, so be aware.
Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
knotdrummer88 
Copper - Posts: 162
Copper spacespace
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Location: Ohio, United States
Posted: April 16, 2010 at 9:32 PM / IP Logged  
well i calculated it out and it came to 2.66 ohms. and the subs would be in different air spaces, so when theyre wired into the amp at 2.66 ohms lets say theyre getting 500 watts total. would the 8 ohm woofer only get say like 200 while the 4 ohm woofer could be getting say 300 watts? im just wondering despite the differdnt ohm ratings that they wouldnt each get half of the watts coming out of the amp. and sorry for the wording im just not sure how to word what i want to ask, but thanks man
stevdart 
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Posted: April 17, 2010 at 5:19 PM / IP Logged  

The power that the amplifier provides is distributed to the speakers according to each speaker's impedance.  A 4 ohm impedance is twice the resistance as 2 ohms, and 8 ohms is twice that of 4 ohms, four times that of 2 ohms.  A 6 ohm impedance is 1.5 times the resistance as 4 ohms;  same rule applies for a 3 ohm compared to a 2 ohm...get the picture?

Even though the two subs are wired together to present a nominal impedance to the amplifier (which causes the amplifier to make power), each has its own impedance that dictates how much of that amplifier's power it will, in return, receive.  So using the bit of Ohm's Law that I stated, the 4 ohm speaker will receive twice the power as the 8 ohm speaker. 

To figure power distribution to your two speakers, divide the total power by three.  (The ratio of power distribution is 2:1, for a total of three equal parts.)  With the given amount of 500 watts, 500 / 3 = 166.66   Twice that is 333.33  So the 4 ohm speaker gets 333 watts and the 8 ohm speaker gets 166 watts.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
knotdrummer88 
Copper - Posts: 162
Copper spacespace
Joined: January 30, 2010
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Posted: April 18, 2010 at 10:25 AM / IP Logged  
wow, thanks a lot man, that answers my question completely
stevdart 
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Posted: April 18, 2010 at 10:05 PM / IP Logged  
You're welcome  :)
Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

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