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Amplifiers
Running 2 ohm speakers parallel
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<blockquote data-quote="zako" data-source="post: 7732355" data-attributes="member: 629735"><p>First, even if this would work, why would you want to do this? This seems like a recipe for bad sound quality. You lose fader control. Also, depending on which speakers have more sensitivity, the rear or front would end up playing louder. You can't predict that since the factory sensitivity numbers are small signal parameters.</p><p></p><p>Next, I don't even think this will work. If you wire your 2ohm JBL speaker in parallel with another 2 or 4ohm speaker, then the final impedance seen by the amplifier will drop below 2ohm. At best, your amplifier will run very hot and go into thermal shutdowns. At worse, you will damage the amplifier. What if you wire speakers in series? The final impedance seen by the amplifier will be the sum of all speaker impedances, so this will work. In fact, if the rear speaker is 4ohm speaker, the final impedance will be 6ohms, which is fairly safe for most amplifiers. However, you still have no fader control.</p><p></p><p>The final problem, is that even without wiring any speakers in parallel, say if you use two channels to run JBL speakers, and the other channels bridged for subwoofer, all amplifier channels internally will see final 2ohm impedance. I would not recommend doing this with a Class A/B amplifier. Class A/B amplifiers already run relatively hot. Force 2ohm impedance on all four channels, and it may go into thermal shutdowns every once in a while on a hot summer day unless extra care was provided to ventilation and proper installation (e.g. not on a side or upside down). I have seen this before. I'd recommend a budget class D amplifier, something like PPI Phantom P900.4. They run more efficiently and cooler.</p><p></p><p>My personal recommendation is not to worry about rear speakers at all. Do not upgrade them and run them off stereo's amplifier. Most expert tuners attenuate their output so that they don't draw the sound stage to the rear of car. Get a four channel to power your front speakers and subwoofer. If you do want to run more power to the rear speakers, do it the right way and get a 5 channel amplifier, or 4-channel + mono.</p></blockquote><p></p>
[QUOTE="zako, post: 7732355, member: 629735"] First, even if this would work, why would you want to do this? This seems like a recipe for bad sound quality. You lose fader control. Also, depending on which speakers have more sensitivity, the rear or front would end up playing louder. You can't predict that since the factory sensitivity numbers are small signal parameters. Next, I don't even think this will work. If you wire your 2ohm JBL speaker in parallel with another 2 or 4ohm speaker, then the final impedance seen by the amplifier will drop below 2ohm. At best, your amplifier will run very hot and go into thermal shutdowns. At worse, you will damage the amplifier. What if you wire speakers in series? The final impedance seen by the amplifier will be the sum of all speaker impedances, so this will work. In fact, if the rear speaker is 4ohm speaker, the final impedance will be 6ohms, which is fairly safe for most amplifiers. However, you still have no fader control. The final problem, is that even without wiring any speakers in parallel, say if you use two channels to run JBL speakers, and the other channels bridged for subwoofer, all amplifier channels internally will see final 2ohm impedance. I would not recommend doing this with a Class A/B amplifier. Class A/B amplifiers already run relatively hot. Force 2ohm impedance on all four channels, and it may go into thermal shutdowns every once in a while on a hot summer day unless extra care was provided to ventilation and proper installation (e.g. not on a side or upside down). I have seen this before. I'd recommend a budget class D amplifier, something like PPI Phantom P900.4. They run more efficiently and cooler. My personal recommendation is not to worry about rear speakers at all. Do not upgrade them and run them off stereo's amplifier. Most expert tuners attenuate their output so that they don't draw the sound stage to the rear of car. Get a four channel to power your front speakers and subwoofer. If you do want to run more power to the rear speakers, do it the right way and get a 5 channel amplifier, or 4-channel + mono. [/QUOTE]
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Running 2 ohm speakers parallel
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