I asked about the sources ( cd player, streamer, turntable, etc. ) because many sources produce enough voltage output, to drive the power amp to full power ( not that you will drive it to full power output, and a turntable would need the gain of a phono stage ). In other words, you do not need the additional gain of a preamp, except with the phono. The 2125 has input level controls ( volume adjustment ), so maybe, just a switcher is needed ( similar to having a passive preamp ). Besides, the Khorns require so little power, this would be a good way to go. Do you have another system to combine the two ?