Summary of Contents for Hybrid Audio Technologies Legatia L3
- Page 1 Hybrid Audio Technologies Legatia ™ 3” Wide Bandwidth Transducer User’s Manual and Car Audio Reference Handbook © 2006, All Rights Reserved...
- Page 2 Legatia L3 midrange. Keep it handy throughout your installation process, and any time you go to improve your audio system with other Hybrid Audio Technologies products.
- Page 3 20 Hz to 20,000 Hz, with the L3 tested in “free air” for eight hours. In the crossover testing sequence mode, our power testing of this driver was performed by using pink noise from 250 Hz to 20,000 Hz, with a fourth order (24 dB/octave) highpass crossover at 250Hz, and with the speakers once again tested in “free air”...
- Page 4 The basket is a high-quality cast aluminum design, which plays a critical role in aligning the voice coil and the magnetic circuit. In the case of the Legatia L3, it uses an aluminum basket instead of a stamped steel frame to ensure idealized clamping strength to the baffle where the speaker will be mounted and less chance of flex/warping.
-
Page 5: Thiele/Small Parameters
The volume of air having the same acoustic compliance as the speaker’s suspension. The mechanical and electrical parameters of the Legatia L3 driver are amenable to a variety of different installations and speaker locations. The high Qms and Qts of the driver will allow it to be used in an infinite baffle configuration. - Page 6 The following are the mechanical and electrical parameters for the Legatia L3 midrange: Overall diameter: Mounting depth: Total depth: Magnet diameter: Mounting hole: Power handling (without crossover): Power handling (with crossover): Frequency range: Sensitivity: Mms: Voice coil diameter: Impedance: Qms:...
- Page 7 Initial In-Car Set-Up; Lessons Learned Lesson One: Off-Axis Response When a speaker like the Legatia L3 is placed in an automotive environment we hear the direct (shortest path) and reflected (longer path) sounds, such as resonances and reverberations. The two sounds are processed by the brain as one sound, and this influences our perception of height, width, and depth of soundstage, as well as rearward ambience.
- Page 8 Figure 1 In scenario “a”, we show the installation of the L3’s in the dashboard or a-pillars. As you can see from the diagram, the PLD’s between the left and right speakers are large, due to the proximity of the listener to the near-side speaker.
- Page 9 Head-related transfer function (HRTF), interaural intensity differences (IID), and interaural time delay (ITD) all play a key role in the optimum placement location for the Legatia L3. A sound wave approaching the eardrum from your chosen speaker location is shaped by interactions with the size and shape of your head, torso, and outer ear, resulting in the HRTF.
- Page 10 The lesson to be learned is that, like Lesson Two, the Legatia L3’s should be placed as far forward from your listening position as possible, and every effort should be made to optimize time and intensity domain characteristics of the installation.
- Page 11 L3 driver can be placed in a completely open baffle, i.e. dipole. A word of caution: an L3 mounted in an open baffle has to move more air than an L3 in an infinite baffle, just simply for the fact that there’s a progressive acoustic short circuit between front and back below the speaker’s Fs in the open baffle configuration.
- Page 12 In layman’s terms, keep baffle dimensions small with respect to the size of the Legatia L3, chamfer or round sharp edges (including, in particular, the mounting hole’s rear inner edge), flush-mount the speaker whenever possible, and use shallow, surface-mounted hardware.
- Page 13 Taking the above into account, your desired crossover frequency for the Legatia L3 should be one that allows the L3 to play as much of the audible spectrum of the spoken voice to ensure point-source delivery of the tones and pinpoint image definition. In many cases, this would be around 200-250 Hz for high pass, and around 6,000 Hz, or higher, for low pass.
-
Page 14: Time Correction
An excellent use of time correction would be to delay the Legatia L3’s and tweeters with respect to the midwoofers and subwoofers, so that the low frequency delay of these drivers is synchronized in the time domain with the output of the midrange and treble frequencies. -
Page 15: Acoustic Treatment
IID and HRTF. After your L3’s are mounted and you’re satisfied with them from a tonal perspective, you may wish to attempt some minor amplitude equalization between the two Legatia L3 midrange drivers to achieve a more stable image that is not frequency dependent, or perhaps to improve image placement or stage coherency. - Page 16 The L3’s can now be mounted in the location deemed to be the best for your vehicle, using the tenets outlined in this manual. Connect the speaker’s large terminal to the amplifier’s positive speaker output and the speaker’s small terminal to the amplifier’s negative speaker...
- Page 17 With the speakers connected, install them into their new locations, and turn the page for detailed ideas for set-up and tuning of your L3’s. © 2006, All Rights Reserved...
-
Page 18: Fine Tuning
Fine Tuning Fine Tuning We hope that by now you have either installed your Legatia L3’s, or now have a plan to install them and get the most performance possible out of them. Now it’s time to indulge what might become one of the more time-consuming aspects of the Legatia L3 installation: fine tuning the L3’s to your car’s own acoustic signature. - Page 19 If the center image (such as a vocalist) seems confused, blurred, or difficult to locate, the Legatia L3’s may be acoustically out of phase. If you are unsure, you can purchase a test CD (readily available from most places) that includes an “in phase”...
- Page 20 The use of a Real Time Analyzer (RTA) is a valuable tool for learning frequency response character of your Legatia L3’s, and should be used for nothing more than a tool, and not a mechanism to tune your car audio system. Your ears, combined with the processor, your brain, are the most advanced test instrument in the world.
- Page 21 Final Thanks Thank You! Hybrid Audio Technologies is delighted that you have chosen the Legatia L3 midrange for your high-end car stereo sound system. We are convinced that a great product offering, backed up with unsurpassed customer service and technical support will advance the Hybrid Audio Technologies namesake in the coming years.
- Page 22 Warranty Hybrid Audio Technologies One Year Limited Warranty Hybrid Audio Technologies, LLC (HAT) guarantees its products to be free from defective material and/or workmanship for a period of one (1) year from date of sale, and will repair or replace, at our sole discretion, defective products under this warranty when the defect occurs under normal installation and use - provided the product is returned to our factory via pre-paid transportation with a copy of proof of purchase (i.e., sales receipt).
- Page 23 References References Blauert, Jens. Spatial Hearing. The Psychophysics of Human Sound Localization. MIT Press, 1997. Hartmann, William M. Auditory Localization in Rooms. Proc. AES 12th International Conf., Copenhagen, 1993, "The perception of reproduced sound", pp. 34-39. Klippel, Wolfgang. Loudspeaker Nonlinearities - Causes, Parameters, Symptoms. 119th AES Convention, New York, October 2005, Preprint 6584.
Need help?
Do you have a question about the Legatia L3 and is the answer not in the manual?
Questions and answers