SE Audiotechnik B 15, Manual

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OMMENDED DSP SETTINGS
43 42
RECOMMENDED DSP SETTINGS
When using B 15 , B 18 and/or B 21 passive subwoofers, both mechanical and thermal protection
techniques should be implemented. SE AUDIOTECHNIK's
®
drivers are designed to reach lower stress
in the suspension parts at greater excursion. However, these protections will assure the proper
behavior of the equipment, its care and safety, and can maximize the performance of the whole
system.
The mechanical protection of a loudspeaker controls the excursion of the cone, so the
physical limits of the spider and the surround are not exceeded. This can be done by
filtering the signal below the safe range of the loudspeaker.
Thermal protection controls the energy of the loudspeaker in the long term, so the
temperature of the magnet and the voice coil is kept under safe levels. This is achieved
by limiting the RMS voltage applied to the loudspeaker, where the maximum allowable
value is its average power handling. This protection depends also on the time constant
selected to trigger and release the limiter.
The table below contains recommended values for the protection mechanisms mentioned before. For
the cone excursion, an additional bell filter is suggested to compensate the slight effect of the high-pass
in the usable range of the subwoofers. For the thermal protection, the maximum RMS voltages supported
by the subwoofers are listed, so the limiter's threshold should not exceed them. Also and for most typical
applications, a time constant from 10 to 50 ms can be set.
Subwoofer B 15 B 18 B 21
Mechanical Protection Filters
High Pass
Type: Butterworth
Slope: 24 dB/oct
f: 35 Hz
Type: Butterworth
Slope: 24 dB/oct
f: 32 Hz
Type: Butterworth
Slope: 24 dB/oct
f: 28 Hz
Bell
(optional)
Gain: +3 dB
f: 38 Hz
Q: 2
Gain: +2 dB
f: 34 Hz
Q: 2
Gain: +2 dB
f: 30 Hz
Q: 4
Thermal Prodection Limits
RMS Voltage Limiter 55 Vrms 69 Vrms 89 Vrms
Finally, a 6
th
-order Butterworth low-pass at 150 Hz is a good generic filter to define the working band of
the subwoofers in the upper range. However, this filter should be defined taking also into account the
other components of the system, specially their frequency response and their position with respect to
the subwoofers.
SPECIFICATIONS
B 15 / B 18 / B 21 SUBWOOFERS
TECHNICAL SPECIFICATIONS
PARAMETER B 15 B 18 B21
ACOUSTICAL
Frequency range (-3 dB)
1
39 Hz - 130 Hz 37 Hz - 130 Hz 33 Hz - 130 Hz
Frequency range (-10 dB)
1
33 Hz - 160 Hz 29 Hz - 160 Hz 25 Hz - 160 Hz
Coverage (-6dB) [H x V] Omnidirectional Omnidirectional Omnidirectional
Nominal impedance 8 Ω 8 Ω 8 Ω
Sensitivity
2
98 dB 99 dB 99 dB
Peak power 1600 W 2400 W 4000 W
Continuous power
3
400 W 600 W 1000 W
Maximum Peak SPL
4
136 dB 138 dB 142 dB
System type 1-way passive system 1-way passive system 1-way passive system
Transducers 1 x 15" driver 1 x 18" driver 1 x 21" driver
Enclosure Vented box Vented box Vented box
Connectors Input / Link signal: 4 Neutrik
speakON® NL4
Link output: 1 Neutrik speakON®
NL4
Input / Link signal: 4 Neutrik
speakON® NL4
Link output: 1 Neutrik speakON®
NL4
Input / Link signal: 4 Neutrik
speakON® NL4
Link output: 1 Neutrik speakON®
NL4
Wiring Pins 1+/1- : driver
Pins 2+/2- : link (Output CH 2,
pins 1+/1-)
Pins 1+/1- : driver
Pins 2+/2- : link (Output CH 2,
pins 1+/1-)
Pins 1+/1- : driver
Pins 2+/2- : link (Output CH 2,
pins 1+/1-)
MECHANICAL
Product dimensions [H x W x D]
(Including rigging)
514 x 494 x 650 mm 572 x 542 x 794 mm 666 x 585 x 832 mm
Net weight 30 kg 41 kg 51 kg
Packaging dimensions
[H x W x D]
613 x 550 x 733 mm 721 x 615 x 885 mm 796 x 685 x 930 mm
Total weight 33.1 kg 49.5 kg 61.5 kg
Cabinet 15 - 18 mm plywood 15 - 18 mm plywood 15 - 24 mm plywood
Cabinet finishing Black or white polyurea coating Black or white polyurea coating Black or white polyurea coating
Grille Powder coated perforated steel Powder coated perforated steel Powder coated perforated steel
Hardware - 2 SE AUDIOTECHNIK®
ergonomic handles
- 4 rubber feet and top recesses
for stacking
- M20 pole thread
- 2 SE AUDIOTECHNIK®
ergonomic handles
- 4 rubber feet and top recesses
for stacking
- M20 pole thread
- 4 SE AUDIOTECHNIK®
ergonomic handles
- 8 rubber feet and top recesses
- M20 pole thread
Stacking Two-point SE AUDIOTECHNIK®
stacking system
Two-point SE AUDIOTECHNIK®
stacking system
-
ACCESSORIES
Stacking frame for M-F3A PRO B 15 SFi M B 18 SFi M -
Stacking frame for L 35 B 15 SFi L35 B 18 SFi L35 -
Pole bar SPS20 SPS20 SPS20
Flight case B 15 FC B 18 FC B 21 FC
Transport dolly B 15 TD B 18 TD B 21 TD
Transport cover B 15 TC B 18 TC B 21 TC
1
Measured with a 6th-order Butterworth low-pass filter applied at 130 Hz.
2
Half space, 1W / 1m, on axis.
3
According to EIA-426B Standard (based on RMS Voltage).
4
Max Peak SPL = Sensi 10log
10
(Continuous Power) + 12 dB Crest factor.