New MOFI speaker (Andrew Jones)

larry - great point, one which had eluded me earlier

sp 10 is 91 db/wm whereas sp-8 is only 87 db/wm --- that is a significant sensitivity difference... a major selling point of the 10 was its fairly high efficiency allowing use with lower powered tube amps, single ended sweeties... that is something definitely traded away if one goes with the 8’s

Ah yes. 10 “ drivers. 8” drivers. Just like the good old days! My ohms are 12” and 8” drivers respectively. Hurray for Real speakers not with undersized drivers that are still around these days and are of high quality but  that won’t break the bank. Happy Days!

+1 @mapman 

One of the big challenges in designing the speaker was to have a 10” woofer respond high enough for the 1.6 khz crossover point (the speaker must have a bandwidth much higher than this point even with a 12 db/octave slope).  That makes it quite impressive that some vintage 18” drivers can operate way up beyond this point.  

Apparently, Hoffman’s iron rule plays here but the trade-off seems too steep. I am on board with @jjss49 in regards to the sensitivity and the ability to use warmer, lower power amp with SP 10. Don’t know if this is a wishful thinking that someone (if not AJ himself) could eventually come up a design with a breakthrough to Hoffman’s rule, i.e., nice 7-8 inch coaxial woofer/tweeter in a SP-8 cabinet that goes down to sub 40 hz and >=90 dB sensitiveity. I’ll jump on it.  Buchardt has  almost done that even in a smaller closed box.