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Re: 102 dB at 80 Hz from a ten in DR250a

Hi Bill - those are respectable figures at both tunings - nice work!

re: Karlson - not sure about T-S - vs peaking - one guy is using a coupler with ~1.5cu.ft. total front & back chamber volume to balance out the old Fostex Sigma 208 - says at 35Hz, tapers add about 10dB (vs off) when things are tweaked - his test room is 180000 cu.ft. and typically. 4 sets of tapers will be evaluated besides all kinds of other variables including vent positioin, type and rear lowpass filter

thanks for the input - oh - on pratical matters - do you have a favorite 12" Eminence for direct radiator? - Delta hs 1.8mm xmax spec but graph & price look OK - for 10" I used B102/10CX - B102 in a small coupler could have used a bit lower Q - really didn't sound all that much different than 10CX woofer - 8CX is neat

Freddy


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