Details - The Last Loudspeaker


Image with 2023 frequency response for Sinus woofer
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!!!
Image with 2023 distortion measurement for Sinus woofer
Distortion figures for Sinus woofer, in cabinet, Close Field.
Distortion is for the complete audio chain, including microphone and all amps.
Image with frequency response for Sinus woofer
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.
Image of distortion figures,Seas Rex Midrange
Seas Rex distortion figures. As before, it includes the complete audio chain.
Image of distortion figures,Eton5
Old Eton 5 inch distortion figures. 2 drivers, in cabinet.
Image of frequency response with and without new Ecophon front pad, tweeter
Visaton tweeter frequency response. Yellow is without Ecophon pad, Green with pad. Note dB scale.
Image of frequency response, TLL tweeter
(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!
Image of frequency response with and without front pad, tweeter
(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!!
Side drawing of TLL Loudspeaker cabinet
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.
Top view drawing of TLL Loudspeaker cabinet.
Old TLL cabinet drawing, top view. Non-parallel inner walls for sand filling, bracing, also in corners.
Drawing of TLL midrange cabinet, top view
Old TLL midrange cabinet drawing, top and front. Structure is concrete, with MDF panels on the outside, and inner walls for sand filling.