"John Phillips"

From http://www.audiokarma.org/forums/arc...p/t-8894.html:

"The Ditton 15 was very popular in the mid70's in the UK, Oz and not
sure where else. Specs are :

Suggested amp rating 10-30 watts
Freq response 30 hz to 15 KHz.
Sensitivity 4.2 Pink noise W at 1M 90dB

If this is reliable [1] the sensitivity was about 84 dB SPL at 1 metre
for 1 W (actual/nominal?).


** Bad maths.

4.2 volts is 3.4 dB more than a nominal 8 ohm watt ( ie 2.83 volts)

So, the maker's rated 1 watt sensitivity is 86.6 dB SPL.



........ Phil