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For the bar shows I use 19" TVs that I picked up used. For my party system I also use a 19" but it is a new magnavox.
I run cable with an RF modulator, if there are other TV's at the venue I can connect to them or sometimes I run my televisions back to back so the audience can see the words. I believe it encourages other potential singers once they see how easy it is.
I currently use a 19" lcd computer monitor that I put on a TV tray with a black fabroc cloth to cover the entire table. Pretty soon I'll be investing in a better stand though.
Flat screen LCDs less weight, less size. Can be mounted on wall mounts that are connected to speaker stands, pole mounts, flat bases, etc.
Why is anyone still using coax when RCA is cheaper, easy to carry, easier to setup and the TVs in most bars have composite connections? For connecting into a bars cable system using many TVs I use one of the 2.4 gig rabbits and send the singal wireless to their cable distribution panel, install it and forget it, then all you have to do is put each TV you want to use on channel 3 or 4 and you are done.
I bought this http://www.adjaudio.com/product.asp?ProductIDNumber=1301&cat=CD_Players at the MB Expo....
It's a dual CD&G player, just came out....
I simply have people sing directly off my laptop
On topic: I generally use the venues' TV/Monitors. I also carry plain Celestron ( department store ) 13 " color TVs with video inputs.
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I do have a 27" that I've used on occasion, but hate hauling it if I don't have to....