RAAL_70-10D-AM Ribbon Tweeter with Amorphous Core

RAAL 70-10D RAAL Ribbon Tweeter with Amorphous Core

TRANSFORMER: The impedance matching transformer is made to transfer the real power without distortion. Not just the shaped noise signal for power measurement methods, but real high-power signal peaks can be transmitted to the ribbon, which preserves the natural dynamics recorded. The primary inductance of the transformers in RAAL ribbons is set to a value which corresponds to the second coil of 4th order L-R high-pass filter at the appropriate cut-off frequency, depending on the model in question. Recently, we finished development of Amorphous C-cores application in our ribbons. Some years ago, we were the first to introduce large gap approach in building ribbon transformers and now we are the first to use AMCC's in ribbons for absolutely uncompressed high power transient transfer and, at the same time, even further improving already the best low-level performance in the world today, by decreasing the width of hysteresis compared to HF ferrite cores. For direct coupled tube SE-ribbon, we succesfuly developed 175:1 ratio, -3dB at 120kHz Amorphous C-core transformers that can carry DC idle current of SET. Impedance conversion is about 30000:1, bringing the 0.1 Ohm ribbon up to 3kOhm, good for plate loading of most triodes in HF.

Size matters. With surface of 21 sq. cm (3.25 in. sq.), super-light 22 mg flat foil, deflector pads, homogenous magnetic field, it represents the finest in today’s mid-high transducer design. Many other details in its construction serve as tools to achieve the flattest possible frequency response and fastest settling time. Its fast and accurate. The main difference is that, contrary to other ribbon drivers, it recreates the spherical sound wave, although it is a straight line source, so the high frequency range is not emphasised and “beamed” to a vertically very narrow space.

Recently, we finished development of Amorphous C-cores application in our ribbons. Some years ago, we were the first to introduce large gap approach in building ribbon transformers and now we are the first to use AMCC's in ribbons for absolutely uncompressed high power transient transfer and, at the same time, even further improving already the best low-level performance in the world today, by decreasing the width of hysteresis compared to HF ferrite cores. For direct coupled tube SE-ribbon, we succesfuly developed 175:1 ratio, -3dB at 120kHz Amorphous C-core transformers that can carry DC idle current of SET. Impedance conversion is about 30000:1, bringing the 0.1 Ohm ribbon up to 3kOhm, good for plate loading of most triodes in HF

True ribbon drivers are well known by their ability of exceptionally fine rendering of the details in music material. They work in a different way than conventional dome or ring HF driver, relieved of all the excess baggage, so to speak, and they do their job better than anything else, regardless of the price tag. No domes, rings, suspensions, coil formers, glues, damping material, not even the lacquer insulation on the wire of the coil. No heavy plastic carrier foils, like in cheap quasi-ribbons. Only 0.004 mm (0.00016 in.) thick aluminum foil, immersed in strong magnetic field. It serves as all the moving parts mention above. 

Tremendous acceleration of air is available with RAAL 70-10, more than 13000 G, and in less than 200 microseconds after, that air is stopped. That brutal controlling force combined with the smoothest response available and bandwidth of 100 kHz, can ensure you that the weak link in any system equipped with it, will not be the HF driver. 

It will show the differences between the electronics or cables without any effort by the listener. The better the electronics chain before it, the better the sound will be. The sound? Well, some people still can’t believe what they can hear with it, for the first time ever, in their well known music material. That comes as standard with, pretty much, all true ribbons, but the effortless recreation of real dynamics, and amazingly high SPL levels for a ribbon of that size, was not known before RAAL 70-10. It doesn’t get intimidated by the big amplifiers. If you have clean power, feed it to the little fellow, and you will be stunned by all the music you have, presented in another dimension of reality. If you don’t have power, and/or you don’t like it, then discover the abundance of detail and true colour of any instrument played in a brand new, engaging manner. Yes, the best quality of HF region, and real, breathing, micro and macro dynamics gives a totally new sense of what the musician(s) wanted to say. It will make you forget that the system is in front of you. The music will come to life.

FEATURES:

- Special FLATFOIL® pure Aluminium ribbon
- Special SYMMLEAD® low inductance signal path
- Special EQUAFIELD® NdFeB magnetic structure
- Special “non-wave-guide” INOX front plate
- Super-fast settling time
- Flat frequency response
- Low nonlinear distortion
- High signal power handling
- Highest reliability

SPECIFICATIONS:

- Ribbon material: aluminium
- Ribbon dimensions: ( 70 x 9.5 x 0.004 ) mm
- Ribbon mass: 0.0075 g
- Ribbon area: 6.65 cm sq.
- Gap induction ( mean value over gap width): 0.62 T
- Frequency response: 2 kHz ~ 100 kHz
- Sensitivity: 92 dB / 1 m / 2.83 V
- Impedance: 8 Ohm
- Program power handling: 150 W*
- *Recommended crossover: 4th order L-R @ 2800 Hz

For measurements, drawings, crossover and more, please download .pdf datasheet here  (1,1Mb)
*please note that the picture on the manufacturers PDF shows these tweeters with binding posts. The current production models do not have binding posts, they have solder pads.