True Ribbon wide band unit, weights 26kg per psc, flat form 600Hz - 25KHz, sensitivity 100dB/W/m, comes in matched pair. You also get the actual measurements and spare ribbons. Comes in original box and will be due to weight will shipped on small wooden palette.0,035g pure aluminium ribbon is suspended in 1T flux gap so you can imagine striking dynamics, speed and transparency this unit has. Hard to listen to any other tweeter after trying this out. Used condition, has been used for a prototype for about a year, since then has been laying in the box for years.There is only slight damage on the protection grill of one unit otherwise perfect condition. This exceptional speaker drive unit is a true Pure Ribbon (not to be confused with metalized film diaphragm) wide band transducer. In a dome tweeter the signal is carried through the voice coil wire, and the sound is radiated by the dome attached to the voice coil former. Here, the carrier of the electrical signal and the radiating diaphragm are one part: the ribbon. Furthermore the ribbon itself is 100% pure conductive material (100% pure aluminum foil, no metal- ized film). The almost immaterial ribbon (1/10th of the mass and more than 60 times the area of a dome tweeter) is immersed in a massive magnetic field created by a unique magnet structure. This impressive transducer integrates the most advanced materials (NeFeB, low carbon alloy, high precision high purity aluminum microfoil) together with the most advanced techniques (FEA assisted magnet design, FEA assisted electromechanical design, precision CNC machining, multi layer plating, controlled viscosity damp- ing). Each unit comes with its built in matching transformer (low insertion loss, wide bandwidth) and individual response curve. The R 3.1 is a totally unique drive unit. Here we pushed the envelope of our original Pure Ribbon Tranducers design to the extreme. The result of this effort is a transducer that has no real counterpart. Imagine that we somehow have here a transducer that is an extraordinary tweeter, and that, by some miracle, this extraordinary tweeter is also a phenomenal midrange. The benefits of the designs are many. The moving mass of your midrange is less than the moving mass of a dome tweeter, allowing exceptional, striking dynamics. The efficiency (about 100 dB over the whole bandwidth), a welcomed bi-product of the extremely favorable ratio moving mass/magnetic force, makes it the ideal companion of low power high quality amplifiers. The coincidence of midrange and high frequencies within a truly com- pact (although massive) device explains a phase response throughout the spectrum and a time coherency that have sim- ply no match from any combination of even the best midrange and tweeter. The R 3.0 can be used from 600 Hz and up. We recommend our own high order slope crossover for optimum rejection of low frequencies. At the same time the very predictable impedance curve of the R 3.1 makes it easy to design simpler crossovers. Subjective evaluation: to characterize a new experience with words is difficult. The first impressions is of extreme dynamics, a sudden “forte” makes you jump for the volume control, fearing that the whole system is going to explode, when it is only playing at 1 to 2 watts. Then there is the eerie sensation of what natural tones truly are. Later you will discover how much beauty there is in the inhabited silence following the last word to escape the soprano’s lips.

Sie bieten auf eine Zeitschrift Klang + Ton Lautsprecher Selbstbau Magazin Ausgabe Februar - März 99 Nr. 2 Guter ZustandAlles vollständig und gut lesbar. Kombiversand möglich.Bis zu 7 Heftchen können für insgesamt 2,95 Euro versendet werden. Die Versandkostenpauschale beträgt 2,95 Euro (für Versand innerhalb Deutschland).Sehr gerne auch Selbstabholung.Falls Sie mehrere Artikel ersteigern, werde ich sie selbstverständlich gemeinsam (soweit technisch möglich) versenden. Hinweis zu Sachmängelhaftung / Gewährleistungsausschluss nach neuem EU-Schuldrecht:Bei meiner Auktion handelt es sich um eine nichtkommerzielle, private Auktion.Ich sichere zu, dass der angebotene Gegenstand in Ausführung und Zustand derBeschreibung entspricht. Sofern nicht ausdrücklich erwähnt, sind mir keineFehler und/oder Mängel bekannt. Als Privatperson kann ich keine weitereGarantie oder Gewährleistung übernehmen. Die Lieferung erfolgt deshalb unter Ausschluss der Sachmängelhaftung.