Re: preout impedance

Originally Posted by
DidUHearThat?
Actually it's best to choose devices with similar impedences, not just lower. Having two or 3 low impedence devices would be great, but, as Squeak expained above, if one is high impedence you could have an impedence mismatch that can cause serious noise problems and even preamp failure. It would be better to have all the devices high impedence than to mix high and low.
There is nothing wrong with using a low output impedance with a high input impedance. this isn't RF. further, the only case i can think of where equipment would be damaged would be in the low-output, low-input impedance case.
You want the output of one device to match the input of the next device. It's very similar to the idea of matching sub impedence to the amplifiers output. It doesn't really matter much what the impedence is, you just want them to match to get the best performance from both.
this would seem to be the exact opposite of what happens. A typical amplifier might have a DF > 100 when used at full power. this means the output impedance of the amplifier is 100 times less then the impedance of the load. Similarly, line drivers often go for very low output impedances as well.
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