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JBL Stadium subs with switchable impedance.....could someone explain how these work?
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<blockquote data-quote="98 SNAKE EATER" data-source="post: 8707208" data-attributes="member: 588245"><p>Ok, could you tell me how they're able to achieve either a 2 or 4ohm load?</p><p></p><p>I've seen other switchable impedance subs that switch from either 2 to 8ohm, which would be simple on a 4ohm DVC sub that uses a switch to go from series to parallel, but this sub has me stumped.</p><p></p><p>At first I thought perhaps the switch would just cut one of the two coils.</p><p></p><p>Like if it was a 2ohm DVC wired in series to get 4ohms and the switch would just disable one coil to make it a 2ohm load....</p><p></p><p>Or if it was a 4ohm DVC wired in parallel to get 2ohms and the switch would just disable one coil to make it a 4ohm load....</p><p></p><p>But of course, if this was the case, it would cut power handling in half and it wouldn't be nearly as efficient.</p><p></p><p>Next thought was perhaps a resistor built into the switch, but I can only imagine what kinda heat issues that would cause.</p><p></p><p>I actually contacted JBL/Harmon directly and none of their reps could give me a straight answer as to how it's done.</p></blockquote><p></p>
[QUOTE="98 SNAKE EATER, post: 8707208, member: 588245"] Ok, could you tell me how they're able to achieve either a 2 or 4ohm load? I've seen other switchable impedance subs that switch from either 2 to 8ohm, which would be simple on a 4ohm DVC sub that uses a switch to go from series to parallel, but this sub has me stumped. At first I thought perhaps the switch would just cut one of the two coils. Like if it was a 2ohm DVC wired in series to get 4ohms and the switch would just disable one coil to make it a 2ohm load.... Or if it was a 4ohm DVC wired in parallel to get 2ohms and the switch would just disable one coil to make it a 4ohm load.... But of course, if this was the case, it would cut power handling in half and it wouldn't be nearly as efficient. Next thought was perhaps a resistor built into the switch, but I can only imagine what kinda heat issues that would cause. I actually contacted JBL/Harmon directly and none of their reps could give me a straight answer as to how it's done. [/QUOTE]
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JBL Stadium subs with switchable impedance.....could someone explain how these work?
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