Quality speakers and a good amplifier make songs sound like the original artists singing live. My speakers are USA made Peavey Impulse 1012's, rated at 500W RMS each and driven by a Peavey PV-1500 1000W RMS stereo power amplifier. They produce crystal clear sound that will cope with audiences of up to 250 people. At an extra cost bass bins can be added so as to cope with greater numbers of people.
My fondness for Peavey equipment extends to my choice of mixers, I have many, but my favourite is my PV-10 usb mixer.
To enhance the mood I use enough disco lighting to project colourful patterns on the ceiling, walls and dance floor of a very large hall.
My standard lighting package consists of 2 DMX controlled NJD 250w Datamoons, a Geni 250w Moonflower, a FXLab DMX (Red/Green) Defraction Laser and a Equinox Ursa Laser (Red/Green/Yellow).
I do not use smoke/haze unless requested and also require permission from the venue management.
These photographs show my twin cdg players, mixer, speakers and disco lighting.
Probably the best vocal microphone in the world is the Shure SM58a Beta, this is a little over the top for karaoke. However similar microphones have been manufactured, one such example is the JTS XN-8 and I use this microphone. Many people have wildly claimed it is better than the Shure. It is certainly very good!
My rig also includes a Kam KWM 1945 wireless microphone and a flat screen TFT monitor from which the karaoke song lyrics are read.
