Well thanks for all advice, I am out of sync with replies being in the UK. Firtly I am 37, male and can hear 19khz test tone through other speakers. Following your other frequency discussions, even bass notes can have a leading edge transient above 20khz, so high frequencies are important.
My tweeters appear to be fine and if I put other speakers in the room I can get solid bass down to 30hz easy. I know the K-horns may drive the room differently. So its now getting a bit harder. I am thinking that the treble response from my speakers is perhaps as it should be (droopy) but the bass still seems curtailed. Overall the sound isn't bad enough to suggest a major problem. I wonder if its just the trade off? old design not hi-fi in the modern sense?. Possibly my expectations were too high. I might just have to decide whether or not I can live with the compromises!!
Again , thanks for all help.
Paul.