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LSR32

LSR32 Linear Spatial Reference Studio Monitor
LSR32 Specification Sheet

The LSR32 Linear Spatial Reference Studio Monitor combines JBL’s latest in transducer and system technology with recent breakthroughs in psychoacoustic research to provide a more accurate studio reference. The Linear Spatial Reference (LSR) philosophy is based on a set of design goals that carefully control the overall performance of the system in a variety of acoustic spaces.

Instead of focusing on a simple measure such as on-axis frequency response, LSR designs require much better control over dispersion via transducer selection and crossover frequency design.

Critical decisions of image placement, EQ, balance and timbre are typically made within +/- 15° vertically and +/- 30° horizontally. This workspace is where the engineer, producer and artist make critical mixing decisions and this is the area that LSR is optimized for superb in room response. By incorporating LSR into the system design requirements, placement rules are relaxed, a more stable image is maintained and off-axis coloration is minimized.

Spatial response characteristics of the JBL LSR32
Legend:
Black: On-axis Response
Green: Spatially Averaged Response over a range of +/-30° horizontally
and +/-15° vertically
Top Red: First Reflections
Top Blue: Total Sound Power
Bottom Red: DI of First Reflection
Bottom Blue: DI of Sound Power

LSR32 Key Features

  • Linear Spatial Reference design based on spatial response measurements and psychoacoustic principles.
  • Differential Drive® Technology with dynamic braking for extended low frequency response and low power compression.
  • Neodymium Midrange with 2" voice coil and KevlarTM cone material for extended frequency response and low distortion.
  • Titanium Composite High Frequency Device with Elliptical Oblate Spheroidal Waveguide and Damped Pole Piece.
  • Carbon Fiber Composite Baffle for low cabinet resonance and stable inertial ground.
  • Linear Dynamics Aperture Port Design eliminates port noise and reduces port compression.

Transducers

252G Low Frequency Transducer
The neodymium 12" woofer is based on JBL’s patented Differential Drive® technology. With the Neodymium structure and dual drive coils, power compression is kept to a minimum to reduce the fatigue of spectral shift as power levels increase. An added third coil between the drive coils acts as a dynamic brake to limit excess excursion and reduce audible distortion at the highest levels. The cone is made of a graphite/polypropylene composite forming a rigid piston supported by a soft butyl rubber surround.

C500G Midrange Transducer
The midrange is a 2" neodymium magnet structure with a woven 2" Kevlar cone. The powerful motor structure was chosen to support the low crossover point to the woofer. In order to achieve the goal of accurate spatial response the crossover points are located at 250 Hz and 2.2 kHz. These transition points were chosen to match the directivity characteristics of the three transducer
s.

053ti High Frequency Transducer
The high frequency device is a 1" composite diaphragm integrated with an Elliptical Oblate Spheroidal (EOS) Waveguide with 60 x 100 degree dispersion which is critical to the smooth spatial response required in today’s working environments. The Mid and High devices are mounted within millimeters of each other on a cast aluminum sub-baffle that can be rotated for horizontal or vertical placement giving maximum flexibility in placement to reduce console and ceiling splash that destabilizes imaging and depth.

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Specifications
SYSTEM 
Input Impedance (nominal): 4 ohm
Anechoic Sensitivity1:
93 dB/2.83V/1m (90 dB/1W/1m)
Frequency Response (60 Hz - 22 kHz)2: +1, -1.5
Low Frequency Extension,2

-3 dB:
54 Hz, -10 dB: 35 Hz
Enclosure resonance frequency: 33 Hz
Long Term Maximum Power
(IEC 265-5): 200 W RMS; 800 W Peak
Recommended Amplifier Power:
150 W - 1000 W (rating into 4 ohm load)
HF Frequency Control
(2.5 kHz - 20 kHz): 0 dB, -1 dB
Distortion, 96 dB SPL, 1m3:
Low Frequency (below 120 Hz):
2nd harmonic: < 1.5%
3rd harmonic: < 1 %
Mid & High Frequency (120 Hz - 20 kHz):
2nd harmonic < 0.5%
3rd harmonic < 0.4%
Distortion, 102 dB SPL, 1m3:
Low Frequency (below 120 Hz):
2nd harmonic: < 1.5%
3rd harmonic: < 1%
Mid & High Frequency (80 Hz - 20 kHz):
2nd harmonic: < 1 %
3rd harmonic: < 1 % (N.B: < 0.4%, 250 Hz - 20 kHz)
Power Non-Linearity (20 Hz - 20 kHz):
30 watts < 0.4 dB
100 watts: < 1.0 dB
Low - Mid Frequency Crossover:
4th order Acoustic Linkwitz-Riley: 250 Hz
Mid - High Frequency Crossover:
4th order Acoustic Linkwitz-Riley: 2.2 kHz
TRANSDUCERS
Low Frequency Model: 252G
Diameter: 300 mm (12 in.)
Voice Coil: 50 mm (2 in.) Differential Drive
with Dynamic Braking Coil
Magnet Type: Neodymium
Cone Type: Carbon Fiber Composite
Impedance: 4 ohm
Mid Frequency Model: C500G
Diameter: 125 mm (5 in.)
Voice Coil: 50 mm (2 in.) Aluminum Edge Wound
Magnet Type: Neodymium
Cone Type: KevlarTM Composite
Impedance: 4 ohm
High Frequency Model: 053ti
Diameter: 25 mm (1 in.) diaphragm
Voice Coil: 25 mm (1 in.)
Magnet Type: Ceramic 5
Diaphragm Type: Damped Titanium Composite
Other Features: Elliptical Oblate Spheroidal Waveguide
Impedance: 4 ohm
PHYSICAL CHARACTERISTICS
Finish: Black, Low-Gloss, “Sand Texture”
Enclosure Volume (net): 50 liter (1.8 cu. ft.)
Input Connectors: 5-way binding posts.
Input Features: Bi-wirable
Net Weight: 21.3 kg (47 lbs)
Dimensions (WxHxD): 63.5 x 39.4 x 29.2 cm (25.0 x 15.5 x 11.5 in.)