218F Low Frequency Transducer

LSR6328P Linear Spatial Reference

Bi-ampliﬁed Studio

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.

High-Density bafﬂe for high inertial ground and low resonance.

Linear Dynamics Aperture port design eliminates port turbulence and reduces port compression.

Reinforced enclosure and convenient mounting points for mounted installation.

Integral handles facilitate ease of positioning.

mounting points to facilitate wall mounting. Recessed handles facilitate easy positioning of the loudspeaker in the environment and aid in transportability.

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.

053TiS High Frequency Transducer

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

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.

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.