Well sorry, I did not realize it was as low as that. It is greater than 10x yes.
However, that statement is not all true with respect to what I said in my post either.
I merely was saying that it would load the output circuitry more than if it was in the line input, which has a far greater input impedance. No?
I suppose it would work running it into the mic in, but the OP clearly notices a subjectively "better" sound. I am sticking to my theory on this one. Unloading the output of the outboard preamp is clearly helping the sound, and my guess is this because the amp was maybe either overshooting, ringing, or the output transformer (if there is one) was doing the same.
Besides..the input doesn't have to be lower than the source impedance to be "loading" the output circuitry and making the amp misbehave. Ten times or more is better, but it doesn't mean that it wouldn't work even better further "unloaded" feeding a 20k input.
You are saying the input could be just twice the output impedance, and there wouldn't be any loading
Also, are you certain on the industry designs line ins around 2k input impedance?
This seems very low to me for a line input.
Why is that a Neve 8816 for example, has an input impedance of 20k then? Are they just an esoteric odd man out? This seems typical to me, as this seems to be about average for most converters and line inputs.
I think you misunderstand my post, or maybe I wasn't clear?
Loading is a term I have most often seen used as in "How much is the input "loading the output of that amplifier". As in what "load" is that amp being asked to drive?
There was a time when electronics 101 was considered art of being an audio engineer FWIW. Sorry if I came away looking like a jackass know it all...I am certainly not ...at least not a know it all :0)
I am no expert by any means, but I know enough to get by. When I get in over my head, I ask people who know much more than I do... Impedance bridging - Wikipedia, the free encyclopedia