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Wiring, Electrical & Installation
Wiring subwoofers with different ohm voice coils together
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<blockquote data-quote="02WS6" data-source="post: 8691203" data-attributes="member: 678581"><p>Another TL/DR for most but feel free to read for some entertainment value:</p><p></p><p></p><p></p><p>How? You explained how to wire the subs, not how to change the internal impedance of the voice coils which is impossible. Resistance or load the amp sees ≠ Impedance</p><p></p><p></p><p></p><p>You're missing the point but I'll do my best to help you refocus on the actual problem OP is facing if he followed your advice.</p><p></p><p></p><p></p><p>Again all you did was tell him how to wire the subs together to provide a complete resistance load to the Amp of 1.3 ohms. The amp should be fine, no one in this thread contested that. I’m contesting how the load is split between the two subs.</p><p></p><p></p><p></p><p>Do you know how forums work or just Facebook and Reddit? Forums have post counts and join dates for a reason. Those with higher post counts and who have been members for a longer period of time USUALLY, have seen more crap and are more experienced. I’m speaking in generalizations, I’m sure there are plenty of senior members who are wrong from time to time but I have a feeling they’re wrong less than someone with <50 posts when it comes to car audio. Seeing as this is a car audio forum those post counts mean the more "Senior Members" have contributed a helluva lot more to this place than either of us have and I for one respect that, much in the same way I'd respect it in any other forum. If you don't like it then go hang out on 4Chan, they hate post counts or usernames over there.</p><p></p><p><strong>I'm not contesting your original response, only that you glossed over one of the main issues of wiring two different impedance subwoofers together:</strong></p><p></p><p></p><p></p><p>Correct on all counts - Again my issue is you glossing over the fact that the two wildly different subwoofers don’t get the same amount of power. Just to recap in case anyone forgot</p><p></p><p>Shallow Mount - D2 - 400W RMS</p><p>vs</p><p>Standard Mount - D4 - 1200W RMS</p><p></p><p></p><p></p><p>I have nothing to contest here, it's all electrically sound except for one formula you forgot to mention. Which you even mentioned above and I highlighted for good measure. "The subs wont get the same amount of power". You're exactly right but then you're not even remembering that you brought it up! How does a current load balance in a perfectly imbalanced circuit? Let's say for example, 2 ohm voice coils vs 4 ohm voice coils? Oh that's right it still follows the path of least resistance so the 2-ohm voice coils will be getting about 70% of the current where the 4-ohm voice coils will be getting about 30%. No matter how you wire the final load the amp sees, you still cannot change how the internal voice coil impedance will consume that power. You've protected the amp, but the lower rated and more sensitive sub will still be getting 2/3rds of the power.</p><p></p><p>The remaining 30% of the power the amp is producing, is consumed on a sub with a lower sensitivity and a much higher RMS rating. So as OP turns the gain (or volume) up, the P3S will be dramatically louder than the Gothic, if he continues turning the gain to get anything out of the Gothic, 70% of that power will keep going to the P3S until one of two things happens. OP realizes that the P3S will blow before he gets anything worthwhile out of the Gothic or he blows up the P3S trying to get the Gothic to hit. THAT is the gear we all believe he's gonna blow up if he wires it the way you advised, the P3S Sub NOT the amp.</p></blockquote><p></p>
[QUOTE="02WS6, post: 8691203, member: 678581"] Another TL/DR for most but feel free to read for some entertainment value: How? You explained how to wire the subs, not how to change the internal impedance of the voice coils which is impossible. Resistance or load the amp sees ≠ Impedance You're missing the point but I'll do my best to help you refocus on the actual problem OP is facing if he followed your advice. Again all you did was tell him how to wire the subs together to provide a complete resistance load to the Amp of 1.3 ohms. The amp should be fine, no one in this thread contested that. I’m contesting how the load is split between the two subs. Do you know how forums work or just Facebook and Reddit? Forums have post counts and join dates for a reason. Those with higher post counts and who have been members for a longer period of time USUALLY, have seen more crap and are more experienced. I’m speaking in generalizations, I’m sure there are plenty of senior members who are wrong from time to time but I have a feeling they’re wrong less than someone with <50 posts when it comes to car audio. Seeing as this is a car audio forum those post counts mean the more "Senior Members" have contributed a helluva lot more to this place than either of us have and I for one respect that, much in the same way I'd respect it in any other forum. If you don't like it then go hang out on 4Chan, they hate post counts or usernames over there. [B]I'm not contesting your original response, only that you glossed over one of the main issues of wiring two different impedance subwoofers together:[/B] Correct on all counts - Again my issue is you glossing over the fact that the two wildly different subwoofers don’t get the same amount of power. Just to recap in case anyone forgot Shallow Mount - D2 - 400W RMS vs Standard Mount - D4 - 1200W RMS I have nothing to contest here, it's all electrically sound except for one formula you forgot to mention. Which you even mentioned above and I highlighted for good measure. "The subs wont get the same amount of power". You're exactly right but then you're not even remembering that you brought it up! How does a current load balance in a perfectly imbalanced circuit? Let's say for example, 2 ohm voice coils vs 4 ohm voice coils? Oh that's right it still follows the path of least resistance so the 2-ohm voice coils will be getting about 70% of the current where the 4-ohm voice coils will be getting about 30%. No matter how you wire the final load the amp sees, you still cannot change how the internal voice coil impedance will consume that power. You've protected the amp, but the lower rated and more sensitive sub will still be getting 2/3rds of the power. The remaining 30% of the power the amp is producing, is consumed on a sub with a lower sensitivity and a much higher RMS rating. So as OP turns the gain (or volume) up, the P3S will be dramatically louder than the Gothic, if he continues turning the gain to get anything out of the Gothic, 70% of that power will keep going to the P3S until one of two things happens. OP realizes that the P3S will blow before he gets anything worthwhile out of the Gothic or he blows up the P3S trying to get the Gothic to hit. THAT is the gear we all believe he's gonna blow up if he wires it the way you advised, the P3S Sub NOT the amp. [/QUOTE]
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Wiring subwoofers with different ohm voice coils together
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