The Legatia SE L1 Pro R2 is a 58mm (2.3-inch) O.D. “low resonance” wide-bandwidth tweeter driver to compliment both two-way and three-way system designs, where a super high-end tweeter driver is required. The Legatia L1 Pro R2 is based upon the original architecture of the Hybrid Audio Technologies Legatia L1 Pro transducer, as well as the Legatia L1 Pro SE, a special edition version of the L1 Pro. At the onset of the Legatia Pro-Series program, we wanted to be sure that the Pro-Series tweeter could be listened to for long listening sessions with no noticeable listener fatigue, and the L1 Pro R2 answered the call. The L1 Pro R2 is an advancement of the original Legatia L1 Pro design, boasting a ring radiator and diaphragm for exceptional polar response and even broader frequency response, and lower resonance frequency than the original L1 Pro.
The Legatia L1 Pro R2 is a 25mm (1-inch) ring radiator-type tweeter, which is the desired diameter for aplomb performance and class-leading polar response, having an extended linear response and exceptional transient response. The design offers a wide dispersion pattern to make for flexible on- and off-axis installation and speaker location. The L1 Pro R2 doesn’t suffer from typical “heaviness” in tonal quality, typically associated with damped, large-diameter (28mm +) dome tweeters; the L1 Pro R2 can be used for the reproduction of upper midrange and treble frequencies in dedicated multi-way front-stage systems. The following are the L1 Pro R2’s design attributes.
Diaphragm, Power Handling, and Wave Guide
With respect to the diaphragm, the L1 Pro R2 has a slightly heavier moving mass than the L1 Pro (without negatively affecting transient response), which in turn has afforded more damping character, while the resonance has been lowered by 120 Hz over the L1 Pro (580 Hz). Nominal and thermal power handling has also been improved over the original L1 Pro transducer; the L1 Pro R2 tweeter has a very high power handling with proper filtering, and the L1 Pro R2 diaphragm is much less susceptible to mechanical deformation than other designs, and yet yields a smooth response over the extent of its range. The diaphragm is protected by a large open-space perforated metal grille that can be removed if desired.
The L1 Pro R2 has several unique features that ensure performance is superior to all other designs in this category. The ring radiator geometry is notorious for delivering a flat, extended response, but many radiator designs have suffered historically from poor off-axis response. The main L1 Pro R2 criteria were to have a ring radiator that could work exceptionally well in a car environment, with an end user’s choice of either on- or off-axis operation with a good polar response. The geometry of the waveguide was paramount to achieving this result and was the subject of a concerted effort by Hybrid Audio Technologies engineers. The waveguide is proprietary to Hybrid Audio Technologies and prevents phase cancellation for uniform frequency response and uniform polar radiation. The addition of the waveguide is also an improvement over a conventional dome tweeter design simply for the fact that the diaphragm is terminated not only at its edges, but also at the center of the diaphragm as well. This feature improves the damping of modal distortion and resonance. In concert with the waveguide is a treated fine cloth diaphragm to ensure smooth frequency response.
Tuned Chamber and Motor
The tuned chamber of the L1 Pro R2 is the key
to the ability of the driver to faithfully reproduce low-octave tones with low distortion, should the end-user desire this type of topology. The L1 Pro R2 has a polypropylene tuned and damped chamber at the rear of the motor assembly; the chamber helps to reduce back wave distortion and significantly lower the tweeter’s resonance frequency to allow it to be used to play tones in the vocal spectrum. The tuned chamber is a proprietary design to Hybrid Audio; reduced distortion, low-octave authority, and greater dynamics are the immediate sonic benefits. The tuned chamber includes integrated push terminals, discussed later.
The motor assembly is conventional dynamic, with a high-grade Φ24.5 × 3.5 H NdFeB neodymium magnet structure to ensure a small footprint size and shallow depth. The result is the total profile of the motor as small as possible, enhancing acoustic performance, and aiding in mounting via small size and low weight. The L1 Pro R2 is one of the shallowest tuned chamber tweeters on the market.
The body and flange of the Legatia L1 Pro R2 is one-piece machined 6061 aircraft-grade aluminum (not poured or cast aluminum). The dense metal structure, lacking interstitial voids, helps reduce vibrations within the body of the tweeter to abate resonance and ensure effective reproduction of extremely low music tones. The L1 Pro R2 is a shared dimensional design with the Stage VI Legatia Pro and the Stage VI Legatia Pro SE for easy upgrade potential. If you already own the L1 Pro or L1 Pro SE, the L1 Pro R2 will drop right into place.
A machined aluminum Φ47.5mm knurled attachment nut at the base of the tweeter provides optimized clamping strength to the mounting media.
The mounting flange, only 3mm larger than the Legatia L1V2 tweeter, provides a solid-aluminum mounting surface for the tweeter without the necessity of mounting cups or external hardware. The overall dimensions of the driver are very amenable for use in the car audio environment, and in locations typical of the standard OEM tweeter mounting locations, as well as in custom locations, boasting a depth of just 27.5mm (1.08-inch), 2.5mm shallower than the sibling L1 Pro tweeter offering.
The L1 Pro R2 tweeter is available in two finishes to ensure cosmetic integration with the vehicle’s surroundings: silver brushed aluminum and anodized black (there is no cost difference between the two colors) with rose-tinted copper phase plug and radiator ring.
The Legatia L1 Pro R2 is a 25mm (1-inch) ring radiator-type tweeter, which is the desired diameter for aplomb performance and class-leading polar response, having an extended linear response and exceptional transient response. The design offers a wide dispersion pattern to make for flexible on- and off-axis installation and speaker location. The L1 Pro R2 doesn’t suffer from typical “heaviness” in tonal quality, typically associated with damped, large-diameter (28mm +) dome tweeters; the L1 Pro R2 can be used for the reproduction of upper midrange and treble frequencies in dedicated multi-way front-stage systems. The following are
the L1 Pro R2’s design attributes.
Terminals Cap and Spring-Loaded Terminals
The L1 Pro R2 includes an extruded polypropylene tuned chamber with integrated high-end nickel-plated spring-loaded push terminals at the rear of the tweeter’s motor assembly. The spring-loaded terminals give the end-user flexibility in direct connection with large-gauge tinned wiring, without the need for crimp terminals.
The Legatia L1 Pro R2 is the ideal multi-purpose super high-end speaker driver. The size of the device and its incredible off-axis ability are amenable to a variety of different installations and speaker locations. The size of the L1 Pro R2 allows it to be mounted in typical OEM and custom locations within a vehicle. At home in virtually any arrangement, the L1 Pro R2 boasts exceptional performance and a design philosophy that goes hand in hand with true high-fidelity playback.