Paradigm® Reference
Click image to enlargeSignature Servo
Single high-excursion driver, Closed-Loop Servo system, sealed enclosure, built-in Ultra-Class-D™ amplifier
Accurate to an Astonishing 10 Hz! The sheer physical demand of reproducing deep bass notes while maintaining formidable output typically leads to a huge driver in a very large enclosure. Not very practical for today’s living spaces! Signature Servo follows a different design path. Our powerful high-excursion bass driver, with massive computer-optimized motor structure is paired with our patented Ultra-Class-D™ amplifier. The driver boasts an extremely rigid proprietary RCR™ cone — able to respond instantly to the leading edge of changing bass notes. The super-efficient amplifier supplies very high power output — 1500-watts RMS, 4500 watts of peak power! Behind the scenes, controlling the driver’s operation, is our patented state-of-the-art Closed Loop Servo system — precisely tracking the input signal to ensure incisively accurate bass, while reducing distortion to inaudible levels. The Signature Servo is accurate to an astonishing 10 Hz! In a typical listening room it can reproduce a staggering 123 dB without audible distortion. It is truly an amazing engineering achievement! Bass performance is so clean, so true, so transparent that only the vivid realism of the deepest or most delicate bass note remains — the source of the bass, the Signature Servo, simply disappears. Control Facilities: • Auto On/Off • Trigger On/Off • Subwoofer Level • Subwoofer Cut-Off Frequency (continuously variable 35 Hz – 150 Hz) • Sub/Sat Phase Alignment (0° to 180°) • Bass Contour Input Facilities: • Line-level Inputs Next-Generation Mineral-Filled Co-Polymer Polypropylene Cones with RCR™ Resonance Control Ribs. High stiffness design is intrinsically low in distortion. Cone is able to respond instantly to the starts and stops of even the leading edge of bass notes. 76-mm (3 in) Bifilar 8-Layer High-Temperature Aluminum Voice Coils. Wound on a high-temperature Apical™ former in an oversize 8-layer bifilar configuration. Provides greater stability and support during extended cone excursion. Leading-Edge Patented Amplifier / Controller. Provides 1500 watts RMS, 4500 watts Peak high-current discrete output, with advanced patented servo controller—compares the output of the accelerometer to the input signal and makes instantaneous amplifier corrections. The amplifier’s massive power output then controls the driver’s cone motion to ensure precise signal tracking. Novel Adaptive PWM Power Processor. Minimizes distortion and optimizes efficiency. Unlike conventional Class-D designs our Ultra-Class-D™ inherently rejects power supply variations. Massive Low-Noise High-Power Toroidal Isolation Transformer. Oversize 6.4-kg (14 lb) advanced-generation transformer allows for an open-architecture Class-D system. Ensures prodigious output and ultra-quiet operation through what is virtually a complete reduction in stray magnetic fields. * DIN 45 500. Indicates -3 dB in a typical listening room. Overview

Specifications
SPECIFICATIONS
Design
Single high-excursion driver,
Closed-Loop Servo system,
sealed enclosure, built-in
Ultra-Class-D™ amplifier
Amplifier: High-Current,
Discrete Output4,500 watts Dynamic Peak /
1,500 watts RMS
Amplifier Features
Auto-On / Off, Trigger On / Off, soft clipping,
electrical shorting protection, thermal protection
Bass Driver
380-mm (15 in) RCR™ mineral-filled
co-polymer polypropylene cone, oversize
surround, 76-mm (3 in) bifilar 8-layer
voice-coil, high-temperature Apical™
former, dual spiders, AVS™ die-cast
heatsink chassis, 13-kg (28.6 lb)
magnet structure
Low-Frequency Extension*
10 Hz (DIN)
Subwoofer Cut-Off Frequency
Variable 35 Hz - 150 Hz
Subwoofer Contour
Variable 0° to +6 dB at 60 Hz
Sub / Sat Phase Alignment
Variable 0° - 180°
Line-Level Input
RCA (S/E) or Balanced XLR. From Sub-Out /
LFE-Out of preamp, processor or
other line-level source
Line-Level Input Sensitivity
100 mV mono
Line-Level Input Impedance
RCA: 25k ohms; XLR: 20k ohms
Internal Volume
83.5 L / 2.95 cu ft
Height, Width, Depth
51.0 cm x 46.0 cm x 55.0 cm
20-2/16 in x 18-2/16 in x 21-1/2 in
(Height includes feet, width
does not include feet)
Weight (unpacked)
51.7 kg / 114 lb each
Finishes
Cherry, Natural Birdseye Maple, Piano Black
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