Krell Industries MASTER REFERENCE SUBWOOFER manual Inputs

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12 RC-5 In

The Master Reference Subwoofer is equipped with an RC-5 input that makes custom installation easy and secure by accepting baseband RC-5 input commands from hardwired remote controllers. The RC-5 input can be used, for example, when the subwoofer’s IR sensor (5) is obscured from direct view.

13 RS-232

The Master Reference Subwoofer is equipped with an RS-232 port, which receives messages from a computer-based control system, providing integrated control of all subwoofer functions. See RS-232, on page 46, and the RS-232 Port: Sending Commands and Interpreting Data developer’s reference for more information.

Notes

The 12 VDC output current is limited to 30 ma.

If the subwoofer is powered on via the 12 V trigger and the signal is active, the front panel power button (1) or RS-232 cannot power it off. You must use the 12 V trigger.

Inputs

14 Left and Right CAST Inputs

The Master Reference Subwoofer is equipped with one pair of left and right CAST inputs via 4-pin bayonet connectors for use with Krell CAST-equipped preamplifiers or surround preamp/processors.

15 Left and Right Balanced Inputs

The Master Reference Subwoofer is equipped with one pair of left and right balanced inputs via XLR connectors.

16 Left and Right Single-ended Inputs

The Master Reference Subwoofer is equipped with one pair of left and right single- ended inputs via RCA connectors.

17 LFE CAST Input

The Master Reference Subwoofer is equipped with a low frequency effect (LFE) CAST input. This input is connected to a CAST-equipped surround preamp/processor, for use with Dolby 5.1 and DTS encoded software.

18 LFE Balanced Input

The Master Reference Subwoofer is equipped with a low frequency effect (LFE) balanced input. This input is connected to a preamp/processor, for use with Dolby 5.1 and DTS encoded software.

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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 CastBest Musical Performance Cast and Krell Current Mode CombinedCast Cables Innovative Subwoofer Technology and Design Ensuring Maximum PerformanceProgrammable Electronic Crossover Krell Active Motion ControlDrivers EnclosureKrell Proprietary Output Devices Krell Cast and Krell Current ModeKrell Core Technologies Totally Balanced Operation Section ONE About Krell Totally Balanced Operation Inputs and Outputs ConfigurationsDefinition of Terms Technology OperationPage To Unpack the Master Reference Subwoofer Unpacking and PlacementUnpacking 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 Remote Connections PowerBack Panel Description 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 ConfigurationsCast and Balanced Connections Connections and ConfigurationsStep I. Choose the 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 Profile Adjust the High-pass Filter ParametersSelect the High-pass Filter Step IV. Match the High-pass and Low-pass Filter Levels Adjust the High-pass FilterAdjust the Low-pass Filter To End Noise Generation Step V. Select the PhaseStep VI. Saving Your Settings to Presets Recalling Presets Steps for Subwoofer Operation follow OperationIf You Wish to Turn Your System Off System ProtectionSubwoofer Care Krell Link Connecting Components Through Krell LinkOptional Connections Krell Link Operation VDC 12 V Trigger RS-232LED Menu Optional ConfigurationsAC Mains 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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