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In article ospam writes:

I agree. I have the 1640 and the 1620, and it looks like Mackie has broken the
mold and created a solid product.

I just got a pile of Onyxen in for evaluation. Anything I should look
for? The first thing I tried intuitively, plugging a generator into
the 1/4" jack on Channel 1, assuming it was a line input like all the
other channels. It didn't work.

I knew that a high impedance input was available with a swith on
Channels 1 and 2 - what I didn't realize until I looked at the block
diagram was that the switch doesn't convert the jack from a medium
impedance lowish gain input to a high impedance medium gain input, it
switches the channel input between the XLR connector and the 1/4"
jack. So if you want to use line inputs on Channels 1 and 2, you have
to select them for "guitar" input. It seems to have the same gain as
the line inputs, but it doesn't seem to be balanced like the other
1/4" inputs, so it isn't an exact replacement.

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