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Section 2: Introduction
Congratulations on your purchase of JBL Professional 3 Series Studio Monitors. The 3 Series meet JBL’s high
standards for accuracy and long-term reliability in demanding professional applications. All 3 Series models
incorporate JBL Professional transducer and network technologies to provide accurate frequency response,
exceptional low frequency extension and high SPL capability. JBL Linear Spatial Reference (LSR) design
ensures greater accuracy at the mix position in acoustically varied workspaces and production environments.
Additionally, each speaker is equipped to interface with a range of signal sources, including high-output
professional audio equipment.
JBL LINEAR SPATIAL REFERENCE (LSR) DESIGN
Because listening environments vary, JBL designed the 3 Series system using Linear Spatial Reference design
criteria that improve accuracy at the listening position in a broad range of rooms. The key to accuracy is
ensuring that not only the on-axis sound is neutral, but also the reected sound reaching the mix position is
neutral.
While most manufacturers take only a single on-axis measurement of the speaker’s performance, Linear Spatial
Reference design criteria requires 72 measurements, taken 360 degrees around the speaker, yielding 1,200
times more data. This data is used in the design of critical system components, enabling JBL to engineer
complete systems that deliver smooth off-axis response. The result: clear, accurate sound at the listening
position in any room.
IMAGE CONTROL WAVEGUIDE
JBL’s revolutionary Image Control Waveguide gives the 3 Series Powered Studio Monitors remarkable imaging,
a wide soundstage, and a solid “phantom center”. Subtle details can be heard, even in a dense mix. As an
added benet, the Image Control Waveguide provides a broad “sweet spot”, so you don’t have to be seated
directly in front of the speakers to hear accurate and natural and open sound.
305P, 306P, AND 308P MKII FEATURES
3 Series MkII models include a range of features to meet the needs of demanding audio production applications:
• The magnetically-shielded low frequency transducers in MkII models, equipped with 1.5" voice coils and
robust motor structures ne tuned for increased linearity, deliver excellent low frequency performance. By
reducing thermal-related effects, the 3 Series MkII Studio Monitors and LSR310S Subwoofer sound the
same at low, medium, and high levels. The woofers are magnetically shielded to prevent interference with
magnetically sensitive displays and equipment. The woofer’s self-repairing dust dome is resistant to dents
caused by ngers or external objects.
• JBL’s patented Slip Stream™ low frequency port design works in concert with the woofer to produce
deep bass response at any playback level. The double-ared shape of the port is precisely engineered for
greater low frequency extension and reduced turbulence.
• The bi-amplied design, with individual power ampliers for the low frequency and high frequency
transducers, uses efcient high-output Class-D integrated power ampliers to provide high SPL (sound
pressure level).
• Magnetically-shielded soft dome high frequency transducers with optimally damped materials improve
transient response and minimize distortion. By reducing distortion in the lower operating range, where the
ear is most sensitive, these transducers reduce ear fatigue.
• Balanced XLR and ¼" input connectors.
• +4dBu / -10dBV INPUT SENSITIVITY switch allows connection to consumer-grade or high-output
professional equipment without danger of input overload.
• Detented VOLUME attenuator allows ne adjustment of levels for a broad range of signal sources.
• HIGH FREQUENCY TRIM control to adjust the high frequency response to taste or compensate for
acoustically reective or absorptive listening environments.
• BOUNDARY EQ switch compensates for low-frequency acoustic anomalies that can occur when
loudspeakers are in close proximity to walls.
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