DALI LEKTOR® Series Technical Whitepaper
Table of Contents INTRODUCTION ............................................................................................................. 3 SPEAKER DRIVERS ...................................................................................................... 4 Low Frequency Drivers ............................................................................................................................................... 4 High Frequency Drivers ........................................................
Introduction Introducing the DALI LEKTOR® Series sets new benchmarks for our 25 years of great Danish speaker design. With two floor standing models, four compact speakers and a subwoofer the LEKTOR® Series is a versatile speaker series that will suit most needs for capable and entertaining sound in a home stereo- or multi channel audio system. The LEKTOR® Series is positioned between our highly acclaimed IKON® Series and the entry level CONCEPT Series.
Speaker Drivers Development of the drivers for the LEKTOR® Series has been one of the most important tasks in the engineering process, since it is a key factor in achieving great performance from the loudspeakers. With 25 years of history within speaker design it should be an easy task – but it never is. Designing the new drivers for the LEKTOR® has been a challenge to push technology and performance even further.
assembly have been optimized for long excursion without collapsing and generating distortion. Despite the fact that the cone assemblies are very light, we have chosen to use a very powerful motor system to make sure that the cone assembly can start and stop promptly. Thereby it can transform the tiniest subtle details in the electrical signal to mechanical movements (and thereby an acoustical signal).
In the development of the tweeter systems we have also focused very much on having a light weight design so that the benefits of having a larger surface area are not wasted. We have used a dome material that is up to 25% lighter than comparable materials typically used for domes. Due to other weight reductions in the dome assembly we have actually managed to reduce the weight up to 40% by comparison with standard materials.
All crossover components are of highly reliable audio grade quality. Unfortunately not always seen in this price range, all components are fastened with glue and cable ties to the circuit board for a highly stable mechanical construction. The component layout is optimized by ear to minimize component crosstalk. As an example, the inductors are individually positioned away from each other and their axes differ to avoid crosstalk between the electrical fields surrounding the inductors.
Figure 4, Half section view of LEKTOR® 1, notice the flared bass reflex ports, which will lower air speed in the ports. Consequently port turbulence is reduced. All bass reflex ports are positioned on the baffle (except for LEKTOR® 8), meaning that the speakers can be positioned very close to the wall without compromising the bass reflex output.
Figure 5, Decorative aluminum snap locks for mounting the grilles. LEKTOR® Series Models As stated in the introduction, the speakers in the LEKTOR® series are very versatile. The speakers perform well both for stereo and multi channel setups. In the following the applications of the different models will exploited. LEKTOR® 8 LEKTOR® 8 is the top model in the LEKTOR® Series. It is very suitable for a competent stereo setup or as main speakers in a large multi channel sound system.
Features: • • • • • • • • 2 x 6½” midrange/woofers with wood fiber cones and low loss surrounds 28mm light weight dome tweeter with aluminum faceplate 2½-way design Audio grade crossover components MDF cabinet with furniture laminate finish/painted baffle Bass reflex ports on the front Single wiring gold plated binding posts for bare wire ends and 4mm banana plugs M8 spikes and rubber feet included LEKTOR® 3 The top model of the compact speakers in the LEKTOR® Series is LEKTOR® 3.
5” woofer size, the bass it can reproduce is incredible – the boundaries for what is possible have really been pushed. When using LEKTOR® 2 it is still possible to get a huge soundstage, rich sound with a lot of details. Typical applications are the same as LEKTOR® 3, but with more focus on shelf/onwall positioning instead of mounting them on a stand. LEKTOR® 3 might also be used as a compact upright positioned center channel speaker.
• • • • • • • 2-way design Audio grade crossover components MDF cabinet with furniture laminate finish/painted baffle Bass reflex ports on the front Single wiring gold plated binding posts for bare wire ends and 4mm banana plugs Integrated wall bracket on the rear for on-wall mounting Rubber feet included LEKTOR® LCR LEKTOR® LCR is one of the most versatile loudspeakers in the LEKTOR® Series – it works as Left, Center and Right channel.
Features: • • • • • • • 10” long stroke woofer with fiber cone 180W class A/B amplifier with integrated crossover Adjustment of: level, crossover frequency, phase Auto power/standby MDF cabinet with furniture laminate finish/painted baffle Bass reflex port on the bottom Stable positioning on rubber feet Amplifier Selection The LEKTOR® speakers are generally an easy load for an amplifier, because they are designed to be what we call amplifier friendly.
Technical Specifications LEKTOR 1 ® LEKTOR 2 ® LEKTOR 3 ® LEKTOR 6 ® LEKTOR 8 ® LEKTOR LCR ® LEKTOR SUB ® Frequency range +/- 3 dB [Hz] 51 - 27000 49 - 27000 48 – 27000 47 - 27000 45 - 27000 52 – 27000 31 – 180 Sensitivity (2.83V/1m) [dB] 84,0 86,0 88,0 90,5 89,0 87,5 - 8 6 6 6 6 8 20k Maximum SPL [dB] 104 106 108 110 112 109 110 Recommended amp.
