ah.. just as I thought. meron pala DVD disc player. so kung DVD, possible nga na multi channel, hence can use coaxial or even HDMI.
pero kung karaoke, 2ch lang talaga yan, alam ko. but who knows when they already remastered karaoke tracks to be multi channel. yung mga sound accompaniments and/or 2nd/3rd voices will be coming from the center, your presence then circle you from your back =))