Thanks all for your help.My monitor is a '93 model,pictures excellent+looks to have been generally well looked after,cos it's in great cosmetic nick,so I guess somethings come adrift or blown inside.I do have a amp with the required aux inputs+bowt 150 watt Missions for a good output,so I will probrably connect them up.But I will take a look inside monitor in next few days.Cheers. :-D