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Linear Spatial Reference
LSR25P Studio Monitor System
Preliminary Owner’s Manual

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Summary of Contents for LSR25P

Page 1: ...1 Linear Spatial Reference LSR25P Studio Monitor System Preliminary Owner s Manual ...

Page 2: ...EN AU PERSONNEL QUALIFIE AVIS POUR EVITER LES RISQUES D INCENDIE OU D ELECTROCUTION N EXPOSEZ PAS CET ARTICLE A LA PLUIE OU A L HUMIDITE The IEC fuse symbol pictured at the left represents an approved user replaceable fuse When replacing a fuse make sure to replace with only the correct type and fuse rating 1 Read Instructions Before operating your new JBL LSR product please read all safety and op...

Page 3: ...idual countries If you are traveling abroad with your system test the power mains and be aware of any specific voltage requirements before operating your system 9 Options Only use attachments or accessories specified by the manufacturer 10 Non use Periods Unplug this apparatus during lightning storms earthquakes fires floods locusts or when unused for long periods of time 11 Servicing Refer all se...

Page 4: ...Audio Connections 4 3 2 AC Power Connections 4 3 3 Audio Level Adjustment 5 3 4 High Frequency Adjustments 5 3 5 80 Hz High Pass Filtering 6 3 6 Workstation Boundary Compensation 6 3 7 LED Indication 6 3 8 Mounting 6 4 0 Specifications 8 4 1 System Specifications 8 4 2 Transducer Specifications 9 4 3 Performance Graphs 10 Appendix A Wiring Recommendations 12 4 Table of Contents ...

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Page 6: ...thin a wide listening window for exceptional performance in a variety of acoustic spaces Attention to these critical aspects results in a rock solid image that remains consistent throughout the entire listening field Linear Dynamics Aperture Contoured ports virtually eliminate high end turbulence found in traditional port designs This provides more accurate low frequency performance at higher outp...

Page 7: ... and the prime listening position As shown below the distance between the monitors and the distance between each monitor and the center of the listener s head are equivalent Vertical vs Horizontal Placement The LSR25P near field is designed to be positioned vertically This orientation eliminates the phase shifts that occur when the relative distances between the woofer tweeter and the listening po...

Page 8: ...loops hum If hum occurs see Appendix A for suggested audio signal wiring and system grounding 2 5 Making Sound Happen After connections are made the next step is to power up all equipment before the amplified LSR25P monitors Reduce the level of the monitor outputs of your console or preamp and also turn the volume on the front of the LSR25P monitors fully counter clock wise for minimum gain You ca...

Page 9: ... shielded 3 1 Audio Connections The LSR25P comes with an XLR and RCA connectors to accommodate a wide range of signal levels and balanced or unbalanced configurations The XLR input is nomi nal 4 dBu sensitivity and the RCA input is 10 dBV Variable user calibration can also be accommodated using the front mounted volume control Positive voltage to Pin 2 of the XLR or the pin of the RCA jack will pr...

Page 10: ...ded the front channel volume control can be adjusted down The front panel adjust ment gives 9 dB of attenuation in the 12 o clock position 3 4 High Frequency Adjustments A group of four DIP switches are located in a recess on the back of the LSR25P These allow the user to adjust various aspects of the frequency response Switch 3 boosts the high frequency response by 1 5 dB above 2 3 kHz when moved...

Page 11: ...ed near a wall or other boundary surface 3 7 LED Indication A single Bi Color LED indicator is located on the front of the LSR25P In normal operation this LED will be GREEN At the onset of amplifier clipping in either the low or high frequency amplifier the LED will flash RED Continual RED flashing of this LED indicates that levels should be reduced 3 8 Mounting The LSR25P has built in mounting po...

Page 12: ...7 Section 3 General Operation ...

Page 13: ... Input Sensitivity XLR 4 dBu 96 dB 1 m RCA 10 dBV 96 dB 1 m AC Input Voltage 115 230 VAC 50 60 Hz User Selectable AC Input Voltage Operating Range 15 AC Input Connector IEC Long Term Maximum System Power 110 Watts IEC265 5 Self Generated Noise Level 10 dBA SPL 1 m User Controls High Frequency Control 3 kHz 20 kHz 1 5 dB 0 dB 1 5 dB Workstation Boundary Compensation Active or Bypass Low Frequency A...

Page 14: ... 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 70 mm 2 7 in above the center of the woofer Acoustic loading provided by the listening room increases Maximum SPL capa bilities and Low Frequency Bass Extension as compared to stated anechoic val ues Dis...

Page 15: ...0 600 500 400 300 200 100 0 100 200 20 20K dB SPL Frequency J o ess o a Amplitude and Phase Hz 100 1000 10000 60 70 80 90 100 20 20K dB SPL Frequency J o ess o a 96 dB 1 m Distortion raised 20 dB Hz 100 1000 10000 60 70 80 90 100 Directivity dB 0 10 20 30 40 20 20K dB SPL Frequency 2nd Harmonic 3rd Harmonic ...

Page 16: ...11 Section 4 Specifications ...

Page 17: ...m the AC power connector When using balanced sources with the LSR25P it is recommended to use the XLR input on the LSR25P This maintains a balanced signal and is the best way to reduce the possibility of hum or other interference For balanced sources the HOT signal from your source should be connected to Pin 2 of the XLR input as shown in Diagram A The COLD signal should be con nected to Pin 3 of ...

Page 18: ...hat high quality twisted pair cable be used when using the XLR input of the LSR25P Diagram D shows an unbalanced source connected to the bal anced XLR input of the LSR monitor using twisted pair cable Note that the shield is con nected to the GROUND SHIELD connector at the LSR input but not at the source This reduces the likelihood of introducing a ground loop into the system Diagram D and E are s...

Page 19: ...Diagram D Diagram E 14 Appendix A Wiring Recommendations Tip Sleeve Pin 2 Pin 3 Pin 1 LSR XLR Input Unbalanced Source Tip Sleeve Pin 2 Pin 3 Pin 1 LSR XLR Input Unbalanced Source ...

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Page 21: ...JBL Professional 8500 Balboa Boulevard P O Box 2200 Northridge California 91329 U S A www jblpro com A Harman International Company LSR25P MANUAL 98100056 00 CRP 1M 11 99 ...

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