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Lsr28P - JBL LSR Owner's Manual

Linear spatial reference studio monitor system
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LSR28P SPECIFICATIONS
System:
Frequency Response (+1, -1.5 dB)
2
: 50 Hz - 20 kHz
Low Frequency Extension: User controls set to default
-3 dB: 46 Hz
-10 dB: 36 Hz
Enclosure resonance frequency: 38 Hz
Low - High Frequency Crossover: 1.7 kHz (6th-Order Acoustic Linkwitz-Riley)
Distortion, 96 dB SPL, 1m:
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: XLR, Balanced Pin 2 Hot
Calibrated Input Sensitivity:
XLR, +4 dBu: 96 dB/1m
1/4", -10 dBV: 96 dB/1m
AC Input Voltage: 115/230VAC, 50/60 Hz (User Selectable)
AC Input Voltage Operating Range: +/- 15%
AC Input Connector: IEC
Long Term Maximum System Power: 220 Watts (IEC265-5)
Self Generated Noise Level: <10 dBA SPL/1m
User Controls:
High Frequency Control (2 Khz - 20 kHz):+2 dB, 0 dB, -2 dB
Low Frequency Control (<100 Hz) +2 dB, 0 dB, -2 dB
Low Frequency Alignments: 36 dB/octave, 24 dB/octave
Calibrated Input Attenuation: 5 dB, 10 dB
Variable Input Attenuation: 0 - 12 dB
Transducers:
Low Frequency Model: 218F
Diameter: 203 mm (8 in.)
Voice Coil: 38 mm (1.5 in.) Differential Drive
Magnet Type: Ferrite with Integral Heat Sink
Cone Type: Carbon Fiber Composite
Impedance: 2 ohm
High Frequency Model: 053ti
Diameter: 25 mm (1 in.) diaphragm
Voice Coil: 25 mm (1 in.)
Magnet Type: Ferrite
Diaphragm Type: Damped Titanium Composite
Other Features: Elliptical Oblate Spheroidal Waveguide
Impedance: 4 ohm
Amplifier:
Low Frequency Topology: Class A-B, All Discrete
Sine Wave Power Rating: 250 Watts (<0.1% THD into rated impedance)
THD+N, 1/2 power: <0.05%
High Frequency Topology: Class A-B, Monolithic
Sine Wave Power Rating: 120 Watts (<0.1% THD into rated impedance)
THD+N, 1/2 power: <0.05%
Physical:
Finish: Black, Low-Gloss, "Sand Texture"
Enclosure Volume (net): 50 liter (1.0 cu. ft.)
Low Frequency Vent: Rear Ported Linear Dynamics Aperture
Baffle Construction: Carbon Fiber Composite
Cabinet Construction: 19mm (3/4" M.D.F.)
Net Weight: 22.7 kg (50 lbs)
Dimensions (WxHxD): 406 x 330 x 325 mm (16 x 13 x 12.75 in.)
1/4" Tip-Ring-Sleeve, Balanced
with Dynamic Braking Coil
Amplitude and Phase
96 dB/1 m (Distortion raised 20 dB)
102 dB/1 m (Distortion raised 20 dB)
Notes:
All measurements unless otherwise stated made anechoically in a 4π environment
at 2 meters and referenced to 1 meter by the inverse square law.
The reference measurement microphone position is located perpendicular to the
centerline of the low and high frequency transducers, at the point 55 mm (2.2
in.) below the center of the tweeter diaphragm.
The Reference Measurement Microphone position is located perpendicular to the
upper edge of the center of woofer trim ring.
Acoustic loading provided by the listening room increases Maximum SPL capabil-
ities and Low Frequency Bass Extension as compared to stated anechoic values.
Distortion measurements performed with the input voltage necessary to produce
the stated "A" weighted SPL level at the stated measurement distance. Distortion
figures refer to the maximum distortion measured in any 1/10th octave wide
band in the stated frequency range.
JBL continually engages in research related to produce improvement. New mate-
rials, production methods, and design refinements are introduced into existing
products without notice as a routine expression of that philosophy. For this rea-
son, any current JBL product may differ in some respect from its published
description, but will always equal or exceed the original design specifications
unless otherwise stated.
17

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