Brad
You have to be careful when looking at GRF spec`s, Mine are the Memory version
made as a tribute to the founder of Tannoy Guy R Fountain (hence the GRF)
The original GRF was supplied as either a corner cabinet or flat back cabinet and
contained Tannoys Monitor Gold (red silver or black) Version of the Dual Concentric
(DC) Driver. Mine are a derivative of this cone employing similar characteristics and construction
but due to the complex crossovers are not as efficient. Tannoy quote 94db@2.83volts which I am
reliably informed equates to about 92db/1 watt/metre.
http://www.tannoy.com/GRFMemoryThey are fabulous speakers none the less
Regards
Andy