Text copied from Audio Nostalgia https://audionostalgia.co.uk/celestion-ditton-15-review/
"Celestion Ditton 15 were launched in 1966 and were one of the smallest speakers in Celestion’s offer (the smallest speaker in the offer was Ditton 10, shortly followed by County, Ditton 15, Ditton 44 Monitor, Ditton 25 and Ditton 66 Monitor). The Ditton 15 is a two way construction with 1″ dome tweeter, 8″ bass driver and 8″ passive radiator, housed in a relatively rigid, braced enclosure. There is a first order filter feeding the bass driver and a second order filter feeding the tweeter, so a fairly simple crossover setup. From what I gathered, back in the day, these speakers offered very good value for money and sold in thousands in the late 60s and early 70s. According to the Internet sources, Celestion Ditton 15 were eagerly sought after by the stereo conscious public, and became the biggest selling bookshelf loudspeaker of its time."
I was very surprised with amount of action those speakers can produce. They seem to suffice for action movie but as well
they are great for classical or rock music. Sound is warm and pleasant, does not annoy after a while.
Audio Nostalgia gave it little bit more detailed description:
After first listening test I had to check my amplifier to ensure that the treble knob is in the level position… The first impression I got was that there was a bit too much treble in comparison to the other frequencies. People often describe this type of sound as bright. I was a little surprised to see this, as I was expecting the relatively early roll-off of the tweeter to create adverse effect (i.e. lack of treble). It shows how little musical information there is above 15kHz. The Celestion Ditton 15 speakers appear to be fairly transparent, however, their perceived transparency is more of a result of the boosted treble than a characteristic of the actual speakers. Complicated music passages show it clearly, where little Dittons often struggle to keep up. Another bad news is that they don’t seem to have much room around the instruments – these microlevel details that create recording atmosphere are just not there. The soundstage appears deep and wide, however, the imaging is not great. These speakers are good at reproducing male vocals, and I really enjoyed listening to Frank Sinatra on them (not necessary the most realistic reproduction, yet, still enjoyable). If you had read any of my previous reviews, you might have noticed that I often test how well speakers reproduce clapping. I found that a lot of speakers struggle to realistically reproduce it, which often sounds more like frying something on a pan than clapping. Unfortunately Celestions Ditton 15 make clapping sound more like frying. Saxophones and other instruments sound OK but are nothing to write home about. Not to mention relatively weak attack. I had great hopes for these speakers, because of impressive sound of their bigger brothers, 44s and 66s, however, these small bookshelf speakers are a bit of a disappointment.