KEF 105 Measurements.
For my speaker measurements I use a Dayton EMM-6 Microphone and a Tascam US-144MK2. I use Room EQ Wizard and ARTA.
These were all done after the recap except for the spectral decay.
Individual drivers near field:
The levels and distances were not carefully matched, the mid was measured too high in level.
Response at listening position:
Well controlled bass, and a nice gradual sloping response after 10k.
Thd remains below 1% for most of the spectrum.
This was taken before the recap and one id like to revisit. I believe the reading at 5khz is interference from the computer or the environment. Otherwise it shows a fairly clean decay with some mid range hash but no severe resonances.
For speakers made in 1979 I think they measure and sound excellent. The down side is the extremely low 85db efficiency. Even with a high powered amplifier you need a very dynamic (over 20db) recording for any sense of impact.
Just read your notes on recapping of the kef 105s.
I have a pair too and enjoy their sound.
In terms of overall sound quality how did the speakers do after the recapping?
Recapping did help, the most noticeable improvement was imaging, it’s certainly worth doing considering the moderate cost.
Overall considering their age I still think they have excellent sound quality, I still have them, along with a set of 103.2s.