Magnum Speaker Builder Series

Reproduce the Magnum Speaker

The Magnum Speaker Builder Series is intended for builders who wish to reproduce the performance, alignment, and design objectives of the Magnum Speaker through the use of the supplied Magnum Acoustic Engine and published enclosure documentation.

The Magnum Speaker Builder Series provides the engineered portion of the loudspeaker including the horn structure, crossover architecture, tuning system, external wiring, and published enclosure documentation.

Builders supply the Beyma 12BR70 low-frequency drivers, enclosure materials, damping materials, finishing materials, and assembly labor.

When constructed according to the published documentation, builders can expect performance closely aligned with the Magnum Speaker.

The Magnum Acoustic Engine

The Magnum Acoustic Engine combines a large-format horn, professional compression driver, crossover architecture, and Continuum Tuning System into a single pre-assembled and tested package.

Every Acoustic Engine is assembled, tested, and inspected prior to shipment.

Premium Crossover Components

The Magnum Acoustic Engine utilizes Jantzen Audio Superior Z capacitors throughout the high-frequency network.

Selected for their consistency, low-loss characteristics, and long-term reliability, Superior Z capacitors complement the resolution, dynamics, and efficiency of the Magnum platform.

Included

• Complete Magnum Acoustic Engine assembly
• Beyma TD-460N horn
• Beyma CP750Nd compression driver installed and tested
• External crossover network
• Jantzen Audio Superior Z capacitors
• Continuum Capacitor Array
• Continuum Resistor Array
• External jumper wiring between horn and enclosure
• Published enclosure documentation
• Port dimensions and tuning specifications
• Wiring documentation
• Measured performance data
• Support for the published design
• Serialized Builder Series identification badge

Builder Supplied Components

• Pair of Beyma 12BR70 low-frequency drivers
• Cabinet materials
• Port materials
• Internal damping materials
• Finishing materials
• Face wood if desired
• Assembly labor

The Beyma 12BR70 drivers are intentionally builder supplied, allowing builders to source the drivers directly from their preferred supplier.

Continuum Capacitor Array

Three selectable capacitor values allow adjustment of crossover behavior and overall presentation.

• Prominent mids
• Neutral balance
• Relaxed mids

Builders may select the presentation that best complements their room, electronics, and listening preferences.

Continuum Resistor Array

Each Acoustic Engine includes the resistor value used during development and measurement of the published design.

Additional resistor values are supplied to allow fine adjustment of horn level and overall presentation.

• Reference resistor value used for published measurements
• Additional resistor values for system matching
• Bold presentation options
• Neutral presentation options
• Relaxed presentation options

The supplied resistor assortment covers the overwhelming majority of installations. Builders wishing to experiment further may source additional non-inductive resistor values independently.

Published Design Documentation

The supplied documentation includes the enclosure design used during development and measurement of the Magnum Speaker.

• Cabinet dimensions
• Driver placement
• Port specifications
• Recommended materials
• Wiring information
• Assembly guidance

Reference Performance Specifications

System Type
2-way horn loudspeaker

High Frequency
Magnum Acoustic Engine
Beyma TD-460N horn
Beyma CP750Nd compression driver

Low Frequency
Beyma 12BR70

Reference Enclosure
80L vented enclosure

Frequency Response
~34 Hz – 20 kHz

Typical In-Room Extension
Approximately 24 Hz

Sensitivity
~95 dB

Impedance
8 ohms nominal

Measured Performance Data

Published measurements are based upon the specified Beyma 12BR70 drivers, published enclosure design, recommended port tuning, and reference resistor value.

Measurement data is included with the Builder Series documentation package.

Builder Series Identification

Each Builder Series package includes a serialized Builder Series identification badge.

The badge identifies the completed loudspeaker as an official Magnum Builder Series product constructed from published Shinjitsu Audio documentation and distinguishes it from factory-built Reference Series loudspeakers.

Support Policy

Support is provided for loudspeakers constructed according to the published design.

Alternative drivers, enclosure volumes, port dimensions, crossover modifications, or custom cabinet designs may alter performance and fall outside the scope of Builder Series support.

Designed and Built in Arizona, USA

Every Magnum Acoustic Engine is individually assembled, tested, and inspected prior to shipment.

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