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SL 713 - 4 Ohm

Art. No. 2050
7 x 13 cm (2.8" x 5") fullrange driver with high efficiency and highrange rise for good speech audibility. For applications in slim column speakers and in 100 V sound reinforcement networks.

Typical applications

  • Network column speakers
  • Ceiling- mounted speakers in railway carriages and busses

Attributes

  • Moisture-resistant membrane
  • metal design
*Gross price for private customers. Industrial prices are available on request.
Technical Data
Sketch
Amplitude & Impendance Frequency
Directivity pattern
Rated power 10 W
Maximum power 15 W
Nominal impedance Z 4 Ohm
Frequency response 100–20000 Hz
Mean sound pressure level 90 dB (1 W/1 m)
Opening angle (-6 dB) 180°/4000 Hz hor.63°/4000 Hz vert.
Excursion limit +/−2 mm
Resonance frequency fs 180 Hz
Magnetic induction 0.9 T
Magnetic flux 130 µWb
Height of front pole-plate 3 mm
Voice coil diameter 15 mm
Height of winding 5 mm
Cutout diameter 66 x 119 mm (oval)
Net weight 0.28 kg
D.C. resistance Rdc 3.6 Ohm
Mechanical Q factor Qms 8.2
Electrical Q factor Qes 2.2
Total Q factor Qts 1.7
Equivalent volume Vas 1.5 l
Effective piston area Sd 50 cm²
Dynamically moved mass Mms 1.7 g
Force factor Bxl 1.9 Tm
Inductance of the voice coil L 0.2 mH
Connections 4.8 x 0.8 mm (+)/2.8 x 0.8 mm (-)
Temperature range −40 ... 70 °C

Used in / Accessories:

GRAND ORGUE

The toughest challenge for a high-end loudspeaker is to reproduce the lowest frequencies of larger instruments, such as an organ or double bass, with appropriate fidelity. Only very few speakers are at all able to reproduce the lowest register of a church organ and even then only the very best are able to make it sound as if it was coming from an organ pipe. To do credit to a double bass in all its glory without sounding fluffy or over-inflated or, even worse, giving up altogether, is the reserve of very few, outstanding loudspeaker constructions. The "Les Orgues" speaker series, in this case the GRAND ORGUE species, represent exactly that capability. With eight WS 25 E - 8 Ohm woofers, optimised specifically as a free-air system, mounted in a folded, but open baffle, they are able to reproduce bass down to below 20 Hz in a most natural, unhurried and completely unexaggerated manner and with no sign of weakness. Since there is, in effect, no enclosure, the resonant frequency of the woofer is not increased, but in this case even decreased, which enables it to emanate clear, non-compressed extremely low frequencies. The precondition for this low-range bass imaging, which uses double-sided radiation, is, however, also to ensure the speakers are far enough away from the wall. One metre is sufficient, but for full power right to the bottom of the bass range, 2 - 3 metres is preferable.

But the effortless and unobtrusive deep bass is not all, by any means. The bass section, which radiates to both sides, is supplemented by a line array consisting of eight oval SL 713 - 4 Ohm full-range drivers. This moderately priced full-range loudspeaker is characterised by its extremely light paper diaphragm and the voice coil carrier made of kraft paper which, together, ensure absolutely natural sound right through to the highest frequencies.

A key characteristic of line arrays is that they generate a highly focused sound beam in the vertical plane. Outside that main path, a large proportion of the signal is cancelled out by interference. This prevents reflections from the floor and ceiling from even coming into existence, which would impair the precise tridimensional imaging of the music. However this beaming effect is a direct function of the wavelength of the sound radiated. The higher the frequency, and, as a result, the shorter the wavelength, the more extreme the beaming effect. A large array such as we have here in the GRAND ORGUE would normally lead to very extreme beaming in the high-frequency range, which would not reflect the reality of the sound being played. To achieve as uniform a beaming effect as possible across the entire frequency range, which is important to guarantee balanced sound quality in the listening room, we have arranged for a correcting circuit within the array. This circuit ensures that, as the frequency increases, additional output is directed towards the second and third full-range drivers from the top while the output to the other six drivers is gradually reduced. In effect, the array is shortened across the full range steplessly from eight loudspeakers to two. These two loudspeakers should be as close as possible to ear height. If ear height should actually be higher or lower than the midpoint between the second and third full-range drivers from the top, the system can easily be adapted to the situation by wiring up the array in such a way that e.g. the third and fourth drivers from the top are responsible for the higher frequencies. In this way, the cabinet can be tuned in small steps to suit the real situation.

Combining all these technical sophistications in a single cabinet results in an exceptional speaker system which is predestined for the "natural" reproduction of music, but not only for that. Whether it is a keenly picked guitar string, a crisp drum solo, an entire symphony orchestra including an uplifting, heart-warming string section and a powerful brass department, or the veritable queen of all instruments, the organ, it will all come across absolutely authentically, with dynamism and is guaranteed to give you goose pimples. In the same way, voices, male and female, are reproduced faithfully including every tiny detail. Each instrument and voice appear to be hovering in exactly the right place in space, the spatial quality is completely natural and everything is in the defined position.

Anyone on the lookout for loudspeakers for high-quality music, who does not intend to make compromises in terms of frequency response and who is keen on extremely accurate imaging of the stage or orchestra pit, should take a close look at the GRAND ORGUE. The only preconditions are a powerful amplifier and generous distances between the cabinets and the walls to enable the GRAND ORGUE to develop its capabilities.

HINT: The bass part of the GRAND ORGUE, on its own without the full-range drivers, connected directly up to an active source without a passive crossover, acts as an excellent subwoofer and can be used, either singly or as a pair, to support music-orientated high-end loudspeakers and full-range loudspeakers down to the lowest bass frequencies and give home theatres the bottom end that they deserve.

Art. No. 5892

PETIT ORGUE

The toughest challenge for a high-end loudspeaker is to reproduce the lowest frequencies of larger instruments, such as an organ or double bass, with appropriate fidelity. Only very few speakers are at all able to reproduce the lowest register of a church organ and even then only the very best are able to make it sound as if it was coming from an organ pipe. To do credit to a double bass in all its glory without sounding fluffy or over-inflated or, even worse, giving up altogether, is the reserve of very few, outstanding loudspeaker constructions. The "Les Orgues" speaker series, in this case the "Petit Orgue" species, represent exactly that capability. With their WS 25 E - 8 Ohm woofers, optimised specifically as a free-air system, mounted in a folded, but open baffle, they are able to reproduce bass down to below 20 Hz in a most natural, unhurried and completely unexaggerated manner and with no sign of weakness. Since there is, in effect, no enclosure, the resonant frequency of the woofer is not increased, which enables it to emanate clear, non-compressed extremely low frequencies.

In contrast to conventional loudspeaker cabinets in which it is the sheer size that determines, to a large extent, their capability to produce very low frequencies, the "Petit Orgue" can indeed compete with its big brother, the "Grand Orgue", in terms of depth. The differences between them are limited, in the main, to the sensitivity and maximum volume level, while the lower limiting frequency is identical. You have to actually hear with your own ears how this unassuming little speaker pumps those deep-black sound waves around the listening room before you can believe it. It may be that the maximum volume level is restricted, but the very fact that it is able to produce lower bass frequencies than most of the larger column speakers is more than impressive.

The precondition for this low-range bass imaging, which uses double-sided radiation, is, however, to ensure the speakers are far enough away from the wall. One metre is sufficient, but for full power right to the bottom of the bass range, 2 - 3 metres is preferable. It is, therefore, not really feasible to use the "Petit Orgue" as a shelf-mounted solution, despite its modest size.

As in the big brother, oval SL 713 - 4 Ohm full-range drivers are responsible for the range above 300 Hz. This moderately priced full-range loudspeaker is characterised by its extremely light paper diaphragm and the voice coil carrier made of kraft paper which, together, ensure absolutely natural sound right through to the highest frequencies. Since only two of them are in use here, there is no need for separate controllers. It is a good idea, however, to use suitable stands to raise the "Petit Orgue" speakers to ear height because the two full-rangeloudspeakers radiate their output as a beam.

The tonality of these speakers is comparable to that of the "Grand Orgue": highly authentic, direct, dynamic. The bass is incredibly deep and yet retains unobtrusive clarity. With the "Petit Orgue", low-frequency instruments, powerful orchestral moments and voices come across absolutely authentically and with a large portion of live atmosphere. The image of the orchestral layout is clearly defined and focussed, even if, as a result of the construction principle, it cannot quite reproduce the exceptional precision of which the "Grand Orgue" with its 8-fold array is capable.

Be that as it may, the "Petit Orgue" is far more than just a baby brother. It is indeed a fully-fledged high-end loudspeaker system that is designed to appeal to listeners who may not need absolute top-of the range volume levels but who do require deep black crisp bass and extremely authentic instrument layout.

Hint: The bass part of the "Petit Orgue", on its own without the full-rangedrivers, connected direct up to an active source without a passive crossover, acts as an excellent subwoofer and can be used, either singly or as a pair, to support music-orientated high-end loudspeakers and full-range loudspeakers down to the lowest bass frequencies.

Art. No. 5891

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