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JBL LSR6300 Series Technical Note page 8

Studio monitors
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Figure 24. LF and HF adjustments for the
LSR6325P system.
6. Detailed Performance of the LSR6312SP
Subwoofer System:
Overview of System:
Subwoofer system with single 300 mm (12 in) diameter
driver
Self-contained amplifier with 260 watt (continuous)
rating
Enclosure resonance frequency: 28 Hz
Maximum continuous output (35 to 80 Hz): 112 dB,
1 meter
Wide range of user options in system sensitivity,
polarity, and boundary EQ
Wide range of interface/bass management options
Dimensions (W × H × L): 635 × 394 × 292 mm
(25.0 × 15.5 × 11.5 in)
Weight: 22.7 kg (50 lb)
Integral M6 mounting points
Amplitude Matching of LSR6312SP with
LSR6328P:
When the LSR6312SP and LSR6328P are positioned
on the same plane, the −6 dB transition between them
is in-phase, producing flat response over that region,
as shown in Figure 25. However, in many installations
the subwoofer cannot be placed in such an
advantageous position, and the user often has to
change polarity on the subwoofer in order to achieve
the best match at the crossover frequency.
Figure 25. Amplitude matching of LSR6312SP
and LSR6328P.
8
Distortion:
Second and third harmonic distortion of the
LSR6312SP is shown in Figure 26 for an operating
level of 96 dB measured at a distance of 1 meter. The
distortion at 40 Hz is about 8%. With normal positioning
of the subwoofer along a baseboard, the drive level
required to reach 96 dB at that frequency would be
much less than that used for this example, resulting in
even less distortion.
Figure 26. Distortion at 96 dB SPL at 1 meter for
LSR6312SP.
BIBLIOGRAPHY:
1. Button, D., "Magnetic Circuit Design Methodologies
for Dual Coil Transducers," presented at the 103rd
AES Convention, New York, September 1997
2. Eargle, J., & Foreman, C., Audio Engineering for
Sound Reinforcement , Hal Leonard (Milwaukee, 2002)
3. JBL Technical Note, Volume 1, Number 33, JBL
®
Differential Drive
Transducers
4. Linkwitz, S., "Active Crossover Network for Nonco-
incident Drivers, Journal, AES , vol. 24, no. 1 (1976)
5. Toole, F., "Loudspeaker Measurements and Their
Relationship to Listener Preferences, parts 1 and 2"
Journal, AES , vol. 34, nos. 4 and 5 (1986)
JBL Professional
8500 Balboa Boulevard
Northridge, California 91329 U.S.A.
A Harman International Company
© Copyright 2004 JBL Professional
TN VOL 3 NO 2A
CRP ??M
08/04

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