Do the 3 in 1 scart blocks for TVs available in electrical stores cause any deteriation in sound or picture quality compared to a scart going direct to the TV?
I've not noticed any discernable drop in quality on the two I use (on seperate TVs!), and one of them is 5 to 1. However, I'm not a super audio/videophile, and when watching DVDs, my sound goes direct to a seperate amp, bypassing the SCART block for Dolby Digital 5.1 sound. I would imagine that the more you are willing to pay, the better the kit (gold connections etc) and the less likely that there will be any drop in quality.
I used a 3 in 1 that cost about �10 - �15. If I left the Xbox on and tried to watch the tv I could see the xbox pictures in the background. Also had some interference with sound from the video playing when i was watching a dvd.
Most of the time, only one device is outputting to the block in my set up, but I can leave the VCR taping from the NTL box and watch a DVD (all 3 go through the SCART box at some stage) and have never had any sound or picture interference (I also have to confess that most of the SCART leads are �1.99 "Right Price" cheapo ones). However the box I use in this set up is mains-powered and auto-switches the source being output to the TV - maybe this makes a diference?