Reference - RMC™ Room Mode Correction/

Performing An RMC Calibration

the speakers at the mix position and automatically applies corrective filters to dramatically minimize low frequency resonances. Because room modes create resonance at specific frequencies with very narrow bandwidths (sometimes called “Q”), the on-board analyzer has the intelligence to identify the specific frequency and Q and apply a corrective parametric filter to only the component of the signal that excites the problem. The LSR4300 RMC system can place a parametric filter at 73 frequencies (1/24th octave centers) between 20 Hz and 160 Hz, with a variable Q from 1 (1-2/5 octave bandwidth) to 16 (1/11 octave bandwidth), with 3 to 12 dB of attenuation.

When the calibration mic is connected and the RMC analysis is initiated with the press of a single button, the LSR4300’s onboard computer emits a reference tone that is measured at the mix position using the supplied calibration microphone. The computer measures the response received via the microphone and compares it with the original tone being emitted. It determines which if any conditions should be corrected, and then calculates and applies a corrective filter. The entire process takes only a few seconds per speaker.

During the RMC calibration process, the computer trims speaker levels in fine 0.25 dB increments so that all speakers in the system produce equal SPL (sound pressure level) at the mix position. This feature is particularly useful in surround sound applications where space limitations often prevent optimum speaker placement. For example, if the center speaker is closer to the mix position than the other main speakers, attenuation must be applied so your mix balances are correct. Without this correction, your end product will sound unbalanced on a properly calibrated playback system.

Performing An RMC Calibration

To get the benefit of JBL’s revolutionary RMC technology, RMC calibration should be performed The RMC calibration process is simple and easy, taking only a few moments to complete. RMC settings remain in memory even after the speakers are powered down, so typically the process only needs to be performed one time. RMC calibration should be performed:

•The first time you use your LSR4300 monitors. (The front panel RMC button will be lit to remind you of that).

•When the LSR4300 monitors are relocated, repositioned, or moved into a different listening space (either a different room altogether or a different area within the same room).

•After any kind of change to the room’s acoustic treatment (such as adding carpeting, bass traps, or other kinds of diffusers).

•When there is a significant change to the room’s furnishings (such as adding a console enclosure, a sofa, or other large piece of furniture).

RMC settings created in a prior environment are not relevant to the new environment.

If you do not wish to recalibrate the LSR4300 system after repositioning or moving one or more speakers, press the RMC switch to bypass the existing settings.

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JBL LSR4328P, LSR4326P owner manual Performing An RMC Calibration
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LSR4326P, LSR4328P specifications

The JBL LSR4328P and LSR4326P studio monitors are part of JBL’s acclaimed professional audio lineup, known for their precision, clarity, and innovative technology. Designed for critical listening environments, these monitors are ideal for music production, broadcast, and post-production applications.

One of the standout features of the LSR4328P is its 28/26-watt bi-amplified system, which delivers powerful and detailed sound reproduction. The LSR4328P has an 8-inch woofer and a 1-inch titanium tweeter, while the LSR4326P is equipped with a 6.5-inch woofer and the same 1-inch titanium tweeter. This dual-cone design ensures that both low and high frequencies are reproduced accurately, making them suitable for a variety of musical genres.

Both models include JBL’s patented Image Control Waveguide technology. This unique design enhances the monitors’ stereo imaging and provides a wider sweet spot, allowing listeners to experience a more immersive soundstage. With precise positioning of the tweeter, the waveguide helps achieve a smooth frequency response, which is essential for accurate mixing and mastering.

Another notable feature is the integrated room control EQ, which allows users to tailor the monitors to their specific acoustic environment. This helps to counteract the effects of room acoustics, ensuring that the sound remains consistent and accurate regardless of the listening environment. Additionally, both models support various input options, including balanced XLR and TRS connections, making them versatile for different studio setups.

The LSR4328P and LSR4326P also incorporate advanced DSP technology for refined performance. This includes precise limiting and crossover functionalities that ensure optimal power distribution between the woofer and tweeter. The result is a balanced sound that does not compromise on detail or frequency response.

In terms of build quality, both models feature a sleek, professional design with a durable cabinet that minimizes resonance and distortion. They are equipped with a front-mounted volume control, making it easy to adjust levels during sessions. Together, the JBL LSR4328P and LSR4326P blend state-of-the-art technology with user-friendly features, establishing them as essential tools for professionals seeking high-fidelity sound in their recordings.
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