Back in over 20 years, I own a pair of Celestion SL6 speaker. It was a very difficult load speaker and not many power amplifier can drive it well. I have Quad 405 at that time but this speaker is still hungry for power! In the last few years, I use this speaker as my test speaker when I build my amplifiers. This is the only picture that I have left for this speaker.
Even my pair of Celestion SL6 is gone, my brother still keep a pair of SL6si.
