I would recommend the
Yamaha MG12 XLR Stereo Mixer with Compression Feature.
I use a PC w/ HDMI Output to store all the Karaoke
Songs (downloaded for free on YouTube). So use the adapters that I mentioned.
Connections:
YouTube Karaoke (Your Computer or Karaoke Source) --> HDMI Out -->
HDMI Splitter --> A & B
A. HDMI 1 goes to AVR as "HTPC"
B. HDMI 2 goes to
HDMI-to-Component Video + L/R Stereo RCA Converter Box --> A & B
A. Component Video goes to AVR as "Karaoke" for Video
B. L/R Stereo RCA goes to the Yamaha Mixer for Sound --> Yamaha Mixer Audio L/R Outputs goes to AVR as "Karaoke" for Audio
The Microphone connects to the Yamaha Mixer.
For Denon, I would use Direct Mode. Use LFE+Main so you can get Subwoofer/LFE output to your subs even in Direct Mode. Have to use Direct Mode or else you get this weird echo sound.