Krell Industries MASTER REFERENCE SUBWOOFER manual Enclosure, Drivers

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Active Motion Control is a unique circuit topology developed by Krell specifically for the Master Reference Subwoofer. An instrument grade accelerator, mounted to one of the drivers, relays information about the driver’s position to the Active Motion Control circuit, where it is compared to the musical waveform at the amplifier input stage. Amplifier parameters are then adjusted to ensure that driver motion is faithful to the input signal, and feedback is precisely applied to preserve sonic impact. Krell Active Motion Control allows the Master Reference Subwoofer to achieve complete driver control and deliver true-to-life low frequency sound at the same time.

Enclosure

The enclosure is an essential part of any loudspeaker and is particularly significant in subwoofer design. Low frequency energy causes some of the most stable materials to resonate. Enclosure resonance degrades performance and destroys linearity. Krell engineering has attacked these design challenges with a vigorous application of technology, know-how, and innovative build materials.

The enclosure for the Master Reference Subwoofer is made of 1 in. thick, aircraft- aluminum billet. Each of the two driver baffles is a substantive 21/4 in. thick. The subwoofer assembly is held together by 68 machine screws, size 1/4 20 x 1 in. The precision machine finish is black anodized to a pearl-like luster. Fully assembled, the Master Reference Subwoofer weighs 396 pounds. This subwoofer does not resonate.

Drivers

The high performance demands of the Master Reference Subwoofer require drivers of exceptional capability. Krell has researched every aspect of driver design and construction to produce remarkable transducers. The Master Reference Subwoofer contains two 15 in. drivers, which have been custom crafted to Krell’s own rigorous specifications. The drivers are mounted at opposite ends of the case, firing outward, away from one another. They are wired in phase: One driver’s motion has the effect of canceling the motion of the other, rendering the enclosure free of operationally induced vibrations.

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Contents S T E R R E F E R E N C E S U B W O O F E R Master Reference Subwoofer Owner’s Reference Section ONE About Krell, pages OverviewSection Five Operation, pages 42 List of Illustrations Page Letter from Dan D’Agostino Krell Legacy About KrellPage New Approach Current Audio Signal Transmission Traditional Audio System and Voltage Signal TransmissionRevolutionary Krell Cast Technology Basics of CastCast Cables Cast and Krell Current Mode CombinedBest Musical Performance Innovative Subwoofer Technology and Design Ensuring Maximum PerformanceProgrammable Electronic Crossover Krell Active Motion ControlDrivers EnclosureKrell Core Technologies Krell Cast and Krell Current ModeKrell Proprietary Output Devices Totally Balanced Operation Section ONE About Krell Totally Balanced Operation Definition of Terms ConfigurationsInputs and Outputs Technology OperationPage Unpacking Unpacking and PlacementTo Unpack the Master Reference Subwoofer To Remove the Subwoofer from the Packing Crate Master Reference Subwoofer Placement Options AC Power Guidelines PlacementFront Panel Description FeaturesPower LED Power ButtonStand-by LED Front Panel DisplayPower Master Reference Subwoofer Back Panel Description PowerBack Panel Remote Connections Inputs Outputs Operation Keys Battery Installation and Removal Remote Control DescriptionOperation Keys Remote Control FunctionsMenu Keys Filter Selection KeysFilter Parameter Keys Level Adjust KeysOverview Connections and ConfigurationsStep I. Choose the Connections Connections and ConfigurationsCast and Balanced Connections Factory Defaults Switching Between Cast and Balanced InputsDefault Menu Functions To Connect the SubwooferPage To Activate Cast Inputs Choosing Stereo, LFE, or Stereo/LFE When to Use LFE Only OptionAdjust the Low-pass Filter Parameters Step III. Configure the Programmable Electronic CrossoverSelect the Low-pass Filter Select the Low-pass Filter ProfileSelect the High-pass Filter Adjust the High-pass Filter ParametersSelect the High-pass Filter Profile Step IV. Match the High-pass and Low-pass Filter Levels Adjust the High-pass FilterAdjust the Low-pass Filter Step VI. Saving Your Settings to Presets Step V. Select the PhaseTo End Noise Generation Recalling Presets Steps for Subwoofer Operation follow OperationSubwoofer Care System ProtectionIf You Wish to Turn Your System Off Optional Connections Connecting Components Through Krell LinkKrell Link Krell Link Operation VDC 12 V Trigger RS-232AC Mains Menu Optional ConfigurationsLED Menu Unit ID Menu Mute MenuExit Menu Warranty Page To contact the Krell Service Department Return Authorization Procedure

MASTER REFERENCE SUBWOOFER specifications

Krell Industries has long been synonymous with high-end audio equipment, and their Master Reference Subwoofer is a testament to this legacy of excellence. Designed to deliver an unparalleled listening experience, the Master Reference Subwoofer is engineered to provide deep, powerful bass without compromising clarity or detail.

One of the standout features of the Master Reference Subwoofer is its robust construction. The cabinet is made from high-density materials that minimize resonances and vibrations, ensuring that the purity of the audio signal is maintained. This attention to detail is crucial, as unwanted vibrations can color the sound and detract from the listening experience. The design also includes internal bracing that further enhances stiffness, resulting in a more controlled bass response.

At the heart of the Master Reference Subwoofer is a custom-engineered driver, designed to handle the demands of high-powered audio. With a large diaphragm and a powerful motor system, this driver can reproduce lower frequencies with remarkable accuracy. The subwoofer utilizes a sophisticated suspension system that allows for greater travel while maintaining linearity, resulting in an impressive dynamic range. This means that whether you're listening to the subtle nuances of a classical piece or the thunderous explosions of an action movie, the Master Reference Subwoofer can handle it all with finesse.

Krell's proprietary technologies further enhance the performance of the Master Reference Subwoofer. The subwoofer features advanced digital signal processing (DSP) that allows for precise tuning and customization of the audio output. This ensures that the subwoofer can adapt to different room acoustics and individual preferences, resulting in optimal sound quality in any environment. Moreover, the Room EQ feature automatically analyzes the listening space and adjusts the output accordingly, providing an incredible level of personalization.

Connectivity options on the Master Reference Subwoofer are diverse and versatile, including XLR and RCA inputs, making it compatible with a wide range of audio systems. The intuitive interface allows users to easily navigate through various settings, making setup and adjustment a breeze.

In summary, the Krell Industries Master Reference Subwoofer showcases the company's commitment to audio excellence through its unmatched construction, innovative driver technology, and advanced digital processing capabilities. For audiophiles seeking a subwoofer that delivers not just deep bass, but also accuracy and control, the Master Reference Subwoofer stands out as a premier choice, elevating any listening experience to new heights.
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