10 Feb
2014
10 Feb
'14
9:08 a.m.
On Mon, 2014-02-10 at 08:51 +0100, Ralf Mardorf wrote:
On Mon, 2014-02-10 at 01:39 +0000, Fons Adriaensen
wrote:
PS:
"Thanks for the useful post. I have one suggestion, though: I think it
might be better to use 1K resistors rather than 10K. The input impedance
of a typical amp should be in the region of 20K. At audio frequencies
(where impedance-matching doesn't matter) it is best if the input
impedance is at least x10 the output impedance. Assuming an output
impedance in the range 100-600 ohms (plausible for an MP3 player
headphone output), that would keep the total output impedance below 2K
which should result in more signal voltage across the amp's input." -
http://marcusmorris.blogspot.de/2010/04/stereo-to-mono-converter-how-to-do-…
If you're a bit handy with a soldering iron,
all it takes to
mix the DAC outputs to mono would be two resistors and some
short pieces of wire and connectors.
If the OP doesn't use tube amplifiers it should look like this:
http://1.bp.blogspot.com/_BGB-FuSV33o/S7qQlfl_1aI/AAAAAAAAAHY/QO2t7rZP5N0/s…
When using tube amplifiers you might want to add transformers. 