Ralph, thanks for explaining that! This is simply for a speaker I'm thinking of making myself, not for an existing product. Once I model it I'll have a better idea of the impedance curve. But that certainly gives me something to think about. Thanks again!
Amplifier stability with very low impedance, high efficiency mid/tweeter section???
I've been looking for this information everywhere but can't seem to find a clear cut answer. I understand that a very low minimum impedance like 2Ohms is a very difficult task for most amplifiers to drive and may even damage it. But it's also my understanding that this is a current, not a voltage problem. In other words, say we had an MTM speaker that was used ONLY as a midrange from 200hz up, so it wouldn't have to play bass where most current is required. And say it also has a very high efficiency of 97db but also a very low impedance of 2 ohms. Would this be a problem for most amps? Could it damage the speakers? I'm thinking no since the amplifier wouldn't have to put out much voltage or current to output sufficient SPL. But what's the actual answer????
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Just have a good amp with substantial power supply and stable to 4 amp double power into lower ohms preferred my coda has a Massive 3kva potted transformer doubles down to 2 ohms and 120 amps short term take 2-16 amp slow blow fuses . my brothers Gryphon Diablo doubles power to even under 2 ohms the coda is a steal at $5500 or less ,and 3 power choices when you order upto 18 first watts in class A |
@poseidon1500 To prevent the array from being low impedance you can put the midrange drivers in series rather than parallel. The efficiency does not change although the sensitivity does. A lot depends on how you design the crossover and the selection of the midrange drivers but that becomes a simple engineering issue. It would allow the speaker to sound smoother (all other things somehow being equal...) regardless of the amp used. |
Audioman58, I've never listened to a Coda amp but would love to! Ralph, I should say the main reason I want to use two midrange drivers is to match their output level to the tweeter for the same given power input. But I'm going by the notion that two drivers in parallel will result in a 6db boost in output. That is 3db from the doubling of drivers and 3db from the doubling of power. From my understanding two drivers in series will result in the same output as one because voltage for each will be cut in half (-3db) and the doubling of drivers will bring it back up again by 3db. I also don't know the exact explanation between efficiency and sensitivity other than one is expressed in percentage and the other in SPL/power/distance. Either way, last night I modeled the drivers in a typical parallel crossover and it turns out the lowest they dip is 3 ohms. Not as bad as I thought. |
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