Details - The Last Loudspeaker
Frequency response for 2 Sinus woofers, in cabinet, 2 cm distance.
Almost identical, and almost +/- 0.5 dB from 90 Hz to over 300 Hz. This is a nearfield measurement, cone breaks up at approx. 650Hz - measurement valid onny to approx. 400 Hz. Present cross-over is 250 Hz. I bought the woofers around 1980!!!
Distortion figures for Sinus woofer, in cabinet, Close Field.
Distortion is for the complete audio chain, including microphone and all amps.
Old sheet with frequency response for my old Sinus woofer, taken at the Peerless factory outside Copenhagen.
Impressivly straight up to 500 Hz, even with today's standard. The little notch at 200 Hz is a filtershift in the Bruel and Kjaer measuring equipment.
Seas Rex distortion figures. As before, it includes the complete audio chain.
Old Eton 5 inch distortion figures. 2 drivers, in cabinet.
Visaton tweeter frequency response. Yellow is without Ecophon pad, Green with pad. Note dB scale.
(Old)Tweeter freuency response - 10 cm, from impulse measurement. Supersonic peak reduced by passive LCR circuit. +/- around 1 dB from 2000 Hz to 15.000 Hz is not bad!
(Old)Tweeter freuency response - 75 cm, from impulse measurement. Green is without front rockwool pad, yellow with pad. Front layout with 3 loudspeaker cabinets with different shapes is not good for tweeter response, front rockwool pad is extremely effective in this case!!
Old TLL cabinet drawing, side view. Bottom is 25 mm plywood AND a 50 mm light concrete block, bottom has to be extremely solid to hold a weight of over 200 kilos.
Old TLL cabinet drawing, top view. Non-parallel inner walls for sand filling, bracing, also in corners.
Old TLL midrange cabinet drawing, top and front. Structure is concrete, with MDF panels on the outside, and inner walls for sand filling.