JBL LSR6328P manual Linear Spatial Reference Design and Measurement Techniques

￿LSR6328P Linear Spatial Reference Bi-amplified Studio Monitor

RMC™ Equalization

Through the use of a test CD, sound level meter and Q template, the user can identify any dominant room mode over the tuning range from 26 to 96 Hz that effects the LF response at the listening position. The inverse curve can then be entered into the system’s electronics – to exactly compensate the offending peak. Using the RMC Calibration Kit*, the user is also instructed specifically what to look for, and potentially poor room locations can be avoided. RMC kit contains all items required to carry out the RMC system calibration process. *(Purchased sepa- rately. Kit is included with each LSR6312SP Subwoofer)

Conforms to UL STD 6500, Certified to CSA STD E60065

3019665

Linear Spatial Reference Design and Measurement Techniques

We all know that many loudspeakers have similar mea- surements but sound different. By going beyond simple on-axis frequency response measurements, JBL defines the ultimate performance specification for new systems – what it will sound like in your room.

While other manufacturers use a single on-axis frequen- cy response measurement taken at one point in space, JBL measures monitor systems over a sphere that encompasses all power radiated into the listening room – in every direction. This data reflects 1296 times the information of a single on-axis response curve. Seventy-two measure-

ments of the direct sound field, the reflected sound field, and the reverberant field, the entire sound field heard by the listener, is correlated to optimize response at the lis- tening position. In place of spectral smoothing used by some manufacturers, which actually conceals data, the JBL approach actually exposes flaws in systems, such as reso- nances, poor dispersion and other causes of off-axis col- oration.

The data shown below is a set of spatially measured graphs that are the heart of JBL’s philosophy.

LSR6328P Response Curves

1. On-Axis Response

2. Spatially Averaged Response

over a range of +/- 30°

Horizontal & +/- 15° Vertical

3. First Reflection Sound Power

4. Total Radiated Sound Power

5. DI of On-Axis Response

6. DI of First Reflections