Two piece (1Pair): TESLA ARN 738 8ohm vintage woofer SPEAKER 10.6 AlNiCo KLANGFILM project Tesla ARN 738 Woofers Im happy to offer in this auction 2 ultra-rare Tesla ARN 738 woofers with huge Permag-A (Alnico) magnets (each speaker = 3,5 kg!), ultra-fast paper cones with almost ever-lasting rubber surrounds. The parameters of these beauties: Dimensions : 27 cm / 10.6 Impedance : 8 Ohms (I mesured 7.9 and 8.1 Ohms) W. input : 20 W. max : 30Free air resonance : 22 Hz. (!) Freq. Range : 22 Hz. - 2000 Hz SPL : 90 dB. (real dBs) Tflux density : 1.0 Weight : 3,5 kg (each!) and some more parameters: Qes: 0.60; Qms: 12.40; Qts: 0.58; Vas: 190 lt.; Fs: 27.70 appropriate for open baffle w. These speakers go déééép & are lightning fast showing a breathtaking holographic soundstage. I just think there must be a lot of stereo information in the bass region below 150 Hz. I heard many 12” and 15” woofers – also many high regarded Altecs, JBLs etc, but I really think 2 x 2 smaller Tesla reference woofers like these miracles with less moving mass and their extremely large alnico magnets will beat most of them! The speakers are tested, they exellent vintage sound. Are in good condition. Please have a look to the pictures for details. I illustrate this auction - real photos which belong to me. Most of the items are 40 a 50 years old electronics, so it not possible to give any warranty on it ! Delivery to Japan and South Korea is seamless (approximately 21-30 days). Worldwide shipping. Please ask for exact shipping costs before submitting your offer (Hong Kong, Taiwan, Singapore, Canada, Portorico, Portugal....) Only bid in the auction for serious buyers ! You only pay for the transfer costs. Im delighted to answer all your questions and Ill tell you the exact cost of the transfer. Guarantee of a very good 100% professional package.