Don't know. 1978 is the last time I heard a pair. Sorry.
[Not trying to be unhelpful. It's just I was 18 and I am now 48. My hearing was about 5khz better at the top-end back then and I was into Two-Tone and Reggae and Ska and Punk.
I demo'ed KEF 104ab's a few times to some of our 'wealthier' middle-aged customers in a hi-fi shop I worked in part time, so obviously I was having to play 'demo' music that I detested (JM Jarre, Pink Floyd, Genesis, Boney M, Saturday Night Fever sound track etc Yech!) in less than ideal conditions, lined up with a lot of other speakers all wired up to something called a 'comparator' with bell wire and being fed by a large Sony amp and (being 1978) some cheapo plastic Sony direct-drive turntable that rang like a bell on our non-levelled, carpeted and spotlit shelves (PS-11 more than likely). This WAS the 1970s. Watch a DVD of 'Abigails Party' for some idea of the homes this stuff ended up in!
Said middle aged couple would probably be chopping in a beloved 'Dynatron' radiogram (!) - or similar - and I would have been more concerned with the ensuing part-ex negotiations (ie breaking it to them that their radiogram was a worthless pile of sh##e that we would have to pay someone to remove) and the inevitable 'hire-purchase' paperwork than taking notes on the sound quality for posterity.
They were good. That means what it says. Better than most of the speakers around at the time. Not as good as others. I also remember the Celestion Ditton 44's and 66's as being very impressive and Gale 401's were nice too.