ARTISAN     RAAL Ribbon Tweeters      Speakers and Kit's

   RAAL    " LAZY "     Ribbon Driver   9''        3.5 - 5 - 7 - 10 - 14 Ohm selectable  taps            105  ~  111 db            



Raal Lazy Ribbon


  RAAL_Lazy Ribbon
 $1684    AUD           PAIR           Factory Matched pair   
 RAAL_Lazy Ribbon - AM     Amorphous core transformers    
$1790   AUD             PAIR          Factory Matched pair  
  Russell Storey




RIBBON MATERIAL                                             ALUMINIUM
RIBBON DIMENSIONS                        210 x 9.5 x 0.05 mm
RIBBON MASS                                                            0.027 g
RIBBON AREA                                                        2o cm sq.
GAP INDUCTION                                                           0.71 T
FREQ. RESPONSE                                        3kHz ~ 50kHz
PEAK SENSITIVITY         105-106.5-108-1O9.5-111dB selectable
IMPEDANCE                          3.5 - 5 - 7 - 10 - 14 Ohm selectable
TRANSFORMER PRIMARY INDUCTANCE     0.65-0.93-1.3-1.9-2.6 mH
PROGRAM POWER HANDLING @ 3k L-R 4th order               200 W
PROGRAM POWER HANDLING @ 10k 1st order                    30 W












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



Featuring yet another of RAAL's improvements to the fine art of high-end audio transducer design, the novel magnetic circuit that boosts
gap flux and cancels distortion named ,then all of the RAAL usuals: homogenous gapflux, flat foil embossed with standing-wave breaking pattern, symmetrical signal leading inductance cancelling loops, five transformertaps for sensitivity adjustment, amorphous metal or ferrite transformer cores, copper or Siltech'ssilver-gold3% + Kapton wire in primary windings,ribbon replacement kits, copper soldering posts...
this unique ribbon will outperform any compressiondriver horn tweeter in micro and macro-dynamics rendering, not to mention detail, speed, low-level signal information and clarity.It is primarily designed for augmenting high-efficiency"horn" systems, serving as a tweeter or super-tweeter,although any high-efficiency, high-SPL, high power demands will be enthusiastically served by it

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 emphasized and “beamed” to a vertically very narrow space.


Bad directivity characteristics is very audible, like constant presence of sound system in front of the listener, as the brain registers the changes in sound field with small head movements thus inducing the listener to use effort to be very still while listening. Also, too directive speakers, tend to provoke just a few of listening room’s reflections, making the needed diffuse sound field in room deprived of high frequency components, which is another problem to our brain. Real instruments don’t behave that way, so that should be recreated as mush as possible. 140-15D does just that, it makes almost semi-spherical sound wave, like life around us does.


Its ability to produce very high SPL with no audible distortion while keeping the minute music details revealed without any effort, brings natural character of the instrument played into the listening room, with such a quality of sound that upgrades the perspective of a listener to a participant in an event that happened somewhere else in time and place.


It comes easily for the 140-15D to "fool" the human brain in such a way that, all of a sudden, makes everything sound right and just as it should. The brain has no option but to interpret that there are real living people playing real musical instruments, playing in the very room in which, a millisecond ago, contained nothing more than your stereo system. The sensation of hearing "natural" sound is overwhelming. The exact size of all the instruments and vocals, their perfect position within the sound stage, and the clarity of air between the instrument's positions are all instantly recognizable…








Audio professionals about RAAL products and services:

(Provided by the courtesy of the signers)


Alexander, your 140-15D is an amazing tweeter. It is the purest sounding tweeter I have ever heard. You just hear the music. Thank you for building such a wonderful loudspeaker. I have been building custom hi fi and P.A. speakers for over 35 years and I would have to say your tweeter is the most drastic step forward in sound reproduction improvements I have experienced. I am now redesigning my speakers to include your tweeter.

Peter Dix
PDS Pro Audio
Abbotsford, B.C., Canada


I have never experienced a tweeter with so consistent and smooth frequency response measured at 0.28, 1.2 and 2.2 meters. The next best measurement is Waterfall - the shortest decay time ever measured.
Thank you, Aleks, for completely engineered product and excellent workmanship.

Wally Malewicz
WAM Engineering

Hamel, MN, USA


Dear Aleksander, after years of designing and installing monitors and other equipment in state-of-the-art recording studios, your 140-15D true ribbon transducers will change the way I design Speakers. I just installed a system with the 140-15's in passive 2.5 way mid field monitors using 2 x Volt BM220.08’s. All I can say is WOW! Up until now I have only been able to use TAD or Scan Speak tweeters in studio installs. These ribbons share the better qualities of the best dynamic/horn systems with out the power compression or throat resonance. These things have NO coloration and are the most transparent drivers I have ever heard, plus none of the sizzle/distortion that folded ribbons and planar-magnetics are plagued with. I must say, I can not believe the clean SPL these things put out. They easily keep up with the Volts being driven full power with a 500 watt amp! Truly amazing!

Norman Druce
Norman Druce Audio
Owosso, MI, USA


Mr. Radisavljevic, just wanted to drop you a line to thank you for making a stellar product that seriously outperforms its dollar amount. I immediately noticed the stereo image improve. This is a stock comment for decent monitors as far as width is concerned, and I have had this experience before, but your ribbons improved the DEPTH of my stereo image! No small feat. I could hear things that I struggled to place or even hear in a dense mix in the past. They also revealed some problems as far as EQ and placement in my mixes. This is not a phenomenon I am unfamiliar with happening, but usually, weeks or months after I am finished with a record, listening on a friend’s stereo with the distance and perception time and venue provides. You make a product that not only sounds great but bends the space-time continuum! All this and I can listen to them all day with less ear fatigue. Should you find yourself in Detroit in the future, I owe you a beer.

Chris Koltay
High Bias Recordings LLC
Detroit. MI, USA


Hallo Aleksandar, we would like to thank you for making those excellent ribbon tweeters which help to take loudspeaker development to a new level.
We have to confirm that your creativeness in looking for improvements in ribbon design and your exceptional attention to detail as well in design as in manufacture do not only result in excellent measurement performance but also in an amazing sound quality.

Rainer Weber & Klaus Rottenwöhrer
RWA Akustik Systeme
Akustikbau Kaiser

Untergriesbach, Germany


Being a long time user of RAAL ribbons, I have always had considerable problems which are probably going to keep coming up in the future. It has been very difficult to find an adequate partner for them, be it mid-bass or mid units. More or less, only custom built loudspeakers can match these extremely demanding ribbons. With every new project, I face the same time consuming struggle. It often happens that, while listening to other systems without RAAL ribbons, I have to ask: “Excuse me, but are your tweeters working properly?” These ribbons are not capable of hiding or diminishing anything at all. You are able to hear the details from the recording that recording engineers certainly don’t want you to hear. Way to go, Alex! Keep revealing the truth to us in the future!

Nenad Napijalo
Founder, President
N.N. Acoustics Engineering
Belgrade, Serbia


Dear Mr. Radisavljevic, I would like to thank you for your outstanding service and exceptional ribbon drivers. After six years, developing our line of Studio Monitors, it is your expertise that allowed us to finally achieve our goals. Thank you for working so hard and for making such a difference. I look forward to many future projects.

Danny McKinney
Requisite Audio Engineering,
The Standel Amplifier Co.
Los Angeles, CA, USA


We have chosen to include the RAAL ribbon tweeters in our products , due to their excellent performances . Alexander Radisavljevic is the new "wonder boy" among ribbon tweeter designers and is to be compared to the other biggest "stars" like Dick Sequerra and Alain Benard , no if's , no but's.

Guglielmo Burger
Finaudio /
Aliante /
PataAcustica / CC... /
Caterham Acoustics
Revello, Italia


Having had the opportunity to test many ribbons over the years I find the line RAAL ribbons to be the best by far. The high level of engineering that has gone into these units is immediately heard. The detail and accuracy is truly amazing.

Todd Michael
Head Speaker Designer
Yorkville Sound
Toronto, Canada


Hello Aleksandar, I have gone through about $13000.00 worth of tweeters of all types in my quest over the last 3-1/2 years. I have never liked any ribbon that I have tried before. I have found them to be dynamically constrained despite what the magazine and the do-it-yourselfers post. I have also found them to be overly bright and body-less.
Well I can say that I am going to be using your 140-15D ribbon in my reference speaker design, your creation is simply fantastic and probably the best tweeter I have yet to hear. One of the major things I hated about ribbons was their delicacy, your ribbon does away with that issue. Congratulations on doing what seemingly no other manufacturer of ribbon tweeters has been able to do.

Donald Nance Jr.
Tangent Audio LLC
Atlanta, GA, USA


Dear Aleksandar, thank you for the excellent quality tweeter, thank you for the years and years of experience needed to produce such really great quality.

Majid Jafari
R&D Manager
JTS Pro Audio Group
Tehran, Iran