JBL Speaker System LSR6328P User Manual

Linear Spatial Reference  
Bi-amplified Studio  
LSR6328P Monitor  
Key Features:  
Advanced Linear Spatial Reference  
design ensures flatter-off-axis response  
for greater clarity at the mix position.  
RMC™ Room Mode Correction  
provides electronic control of room  
modes. User measurement and  
calibration kit available.  
®
Differential Drive technology with  
dynamic braking for extended low  
frequency response and minimal  
power compression.  
Integrated bi-amplification with  
factory calibrated sensitivities.  
Titanium composite high frequency  
transducer with elliptical oblate  
spheroidal waveguide for precise  
pattern control.  
Magnetically shielded high frequency  
transducer minimizes interference  
when used in close proximity to  
video monitors.  
mounting points to facilitate wall mounting. Recessed handles facilitate easy  
positioning of the loudspeaker in the environment and aid in transportability.  
High-Density baffle for high inertial  
ground and low resonance.  
Linear Dynamics Aperture port  
design eliminates port turbulence  
and reduces port compression.  
218F Low Frequency Transducer  
®
The 8" woofer is based on JBL’s patented Differential Drive technology. With  
dual 1.5" voice coils, power compression is kept at a minimum to reduce spec-  
tral shift as output power levels increase. An added third coil located between  
the drive coils acts as a dynamic brake to limit excess excursion and reduces  
audible distortion at maximum levels. The cone is made of a carbon fiber com-  
posite forming a rigid piston and is supported by a soft butyl rubber surround.  
Reinforced enclosure and convenient  
mounting points for mounted  
installation.  
Integral handles facilitate ease of  
positioning.  
053TiS High Frequency Transducer  
The high frequency transducer has a 1" composite diaphragm integrated with  
an Elliptical Oblate Spheroidal (EOS) Waveguide with wide uniform dispersion  
that is critical to the smooth spatial response required in today’s working envi-  
ronments. The driver is shielded to minimize the interference when used in  
close proximity to video monitors.  
The LSR6328P studio monitor is  
designed for use in critical stereo and  
multi-channel monitoring applications  
that require exceptional spectral accura-  
cy and high SPL capability. The  
LSR6328P combines the latest in JBL’s  
renowned transducer and system tech-  
nology with psychoacoustically derived  
spatial response criteria, resulting in a  
more accurate studio monitoring refer-  
ence system. In this design process, the  
system’s frequency response over the  
forward listening range ( 15° vertically  
and 30° horizontally) is optimized, as  
opposed to the conventional approach  
of optimizing the response directly on-  
axis. This design approach involved  
careful component design, selection of  
crossover frequency, and precise baffle  
geometry and detail. The result is a sys-  
tem that can be used for the most criti-  
cal judgements of recording balance,  
image placement, and equalization. The  
matching of the LSR6328P system to the  
listening environment is further  
enhanced through the use of RMC, an  
analysis/correction system that identi-  
fies and corrects response to compen-  
sate for the dominant low frequency  
standing wave in the system’s room  
response. In addition to a rich array of  
performance features, the LSR6328P has  
a reinforced enclosure and integral  
Bi-amplified Power System  
The LSR6328P combines two high power amplifiers with an active dividing  
network. Included are over 250 watts of continuous low frequency power and  
120 watts for the high frequency section. The active dividing network produces  
a 36/dB-per-octave Linkwitz-Riley type response for smooth transition between  
transducers, both in the frequency and time domains. This results in exceptional  
imaging and a lack of time smear, and the circuitry also yields a tonal-artifact-  
free noise floor.  
Input Sensitivity and Equalization:  
User adjustments include level calibration settings for use with professional  
and semiprofessional equipment, as well as fine tuning with variable level trim.  
Neutrik “Combi” input receptacles accommodate both XLR and ¼" connectors,  
either balanced or unbalanced. DIP switch 1 inserts a variable input trim for up  
to 13 dB of input attenuation. DIP switches 2 & 3 allow selection of either  
-10 dBV, +4, or +8 dBu calibrated input sensitivities on the ¼" or XLR inputs. A  
Very Low Frequency (VLF) high-pass filter provides protection from excess  
woofer excursion at maximum playback levels. DIP Switch 4 disables this filter  
providing slightly extended deep bass response below the enclosure port tuning  
and allowing the user to observe cone motion caused by sub-sonic signal.  
Boundary compensation is user-selectable to correct low frequency and mid-  
bass build-up when the speakers are placed close to a corner or wall. Three  
settings (-1.5 dB, -3 dB, -4.5 dB) are provided using DIP switches 5 & 6. DIP  
switches 7 & 8 provide 1.5 dB high-frequency boost and attenuation to allow  
compensation for dull or bright listening environments.  
 
Amplitude & Phase  
Specifications:  
System:  
Frequency Response (+1, -1.5 dB): 50 Hz - 20 kHz  
Enclosure Resonance Frequency: 38 Hz  
Low Frequency Extension: User controls set to default  
-3 dB: 46 Hz  
-10 dB: 36 Hz  
Low-High Frequency Crossover: 1.7 kHz 6th-order acoustic Linkwitz-Riley  
Distortion, 96 dB SPL, 1 m:  
Mid-High Frequency (120 Hz - 20 kHz):  
2nd Harmonic: <0.6%  
3rd Harmonic: <0.5%  
Low Frequency (<120 Hz):  
2nd Harmonic: <2%  
3rd Harmonic: <1%  
Maximum SPL (80 Hz - 20 kHz): >108 dB SPL / 1m  
Maximum Peak SPL (80 Hz - 20 kHz): >111 dB SPL / 1m  
Signal Input: Neutrik “Combi” XLR-¼-in tip-ring-sleeve balanced or unbal-  
96 dB/1 m (Distortion raised 20 dB)  
anced positive voltage applied to XLR pin 2 (¼" tip) produces  
outward woofer motion  
Calibrated Input Sensitivity, XLR & ¼":  
+4 dBu / +8 dBu: 96 dB SPL / 1 m  
-10 dBV: 96 dB SPL / 1 m  
AC Input Voltage: 100 /240 VAC, 50/60 Hz (auto sensing)  
AC Input Connector: IEC  
Long-Term Maximum System Power: 220 watts (IEC265-8)  
Self-Generated Noise Level: <10 dBA / 1 m Tonal-artifact-free noise floor  
User Controls:  
2nd  
3rd  
High Frequency Control (2 kHz - 20 kHz): +1 dB, 0 dB, -1 dB  
Low Frequency Control (< 100 Hz): 0 dB, -2 dB  
Low Frequency Alignments: 36 dB/octave, 24 dB/octave (VLF protection off)  
Calibrated Input Sensitivity: -10 dBV, +4 dBu, +8 dBu  
Boundary Compensation Settings: 0, -1.5, -3.0, -4.5 dB  
Variable Input Attenuation: 0 dB to -13 dB  
RMC External Bypass: ¼" jack  
RMC Active Switch: In/Out  
RMC Frequency Adjust: 26 Hz - 96 Hz (10th octave, 18 centers)  
RMC Depth Adjust: 0 - 14 dB (cut only)  
102 dB/1 m (Distortion raised 20 dB)  
RMC Q Adjust: 1/20th to 1/2 octave, 21 steps  
Transducers:  
Low Frequency Model: 218F  
Diameter: 203 mm (8 in)  
Voice Coil: 38 mm (1.5 in) Differential Drive® with dynamic braking coil  
Magnet Type: Ferrite, with integral heat sink  
Cone Type: Carbon fiber composite  
2nd  
Impedance: 2 ohms  
High Frequency Model: 053TiS  
Diameter: 25 mm (1 in) diaphragm  
Voice Coil: 25 mm (1 in)  
3rd  
Magnet Type: Ferrite, shielded  
Diaphragm Type: Damped titanium composite  
Other Features: Elliptical oblate spheroidal waveguide  
Impedance: 4 ohms  
Amplifier:  
Low Frequency:  
Topology: Class A-B, all discrete  
Notes:  
Sine Wave Power Rating: 250 watts (<0.1% THD into rated impedance)  
THD + N, ½ Power: <0.05%  
All measurements unless otherwise stated made anechoically in a 4environment at 2  
meters, referenced to 1 meter by inverse square law.  
The reference measurement microphone position is located perpendicular to the cen-  
terline of the low and high frequency transducers at the point 55 mm (2.2 in) below  
the center of the high frequency diaphragm.  
Acoustic loading provided by the listening room increases maximum SPL capability  
and low frequency bass extension as compared to stated anechoic values.  
High Frequency:  
Topology: Class A-B, monolithic  
Sine Wave Power Rating: 120 watts (<0.1% THD into rated impedance)  
THD + N, ½ Power: <0.05%  
Physical:  
Distortion measurements performed with the input voltage necessary to produce the  
stated A- weighted SPL at the stated measurement distance. Distortion figures refer to  
the maximum distortion measured in any 1/10th octave wide band in the stated fre-  
quency range.  
Finish: Smooth dark graphite  
Handles: 2 each, flush mounted on sides  
Mounting: 4 threaded mounting points conforming to industry standard  
square pattern, 127 x 70 mm (5 x 2.75 in) center to center. M6  
metric threads.  
JBL continually engages in research related to performance improvements. New mate-  
rials, production methods, and design refinements are introduced into existing prod-  
ucts without notice as a routine expression of that philosophy. For this reason, any  
current JBL product may differ in some respect from its published description, but will  
always equal or exceed the original design specification unless otherwise stated.  
Enclosure Volume (net): 28 liter (1 cu ft)  
Low Frequency Vent: Rear ported linear dynamics aperture (integrated with  
amplifier heat sink)  
Baffle Construction: Injection-molded structural ABS  
Enclosure Construction: 19 mm (¼ in) MDF  
Net Weight: 17.7 kg (39 lb)  
Dimensions (HxWxD): 406 x 330 x 325 mm (16 x 13 x 12.8 in)  
Caution: Unsafe mounting or overhead suspension of any heavy load can result in serious injury and equipment  
damage. Mounting of speakers should be done by qualified persons in accordance with all applicable local safety  
and construction standards. Be certain to follow the instructions provided by the manufacturer of the mounting  
bracket. Before selecting a mounting bracket, be certain that it is capable of supporting the weight of the speaker  
to be mounted.  
 
LSR6328P Linear Spatial Reference Bi-amplified Studio Monitor  
Acoustic Contribution  
Impulse Response  
JBL Professional  
8500 Balboa Boulevard, P.O. Box 2200  
Northridge, California 91329 U.S.A.  
A Harman International Company  
© Copyright 2005 JBL Professional  
SS LSR6328P  
CRP 5M  
8/05  
 

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