Marantz Imperial 5 Service Manual

The Marantz Imperial 5 is a high-performance bookshelf speaker system featuring a 2-way bass reflex design, 8-inch woofer, 1-inch dome tweeter, 8-ohm impedance, 50-100W power handling, frequency response 45Hz-20kHz, sensitivity 89dB, and walnut wood veneer finish. This service manual provides comprehensive technical documentation for installation, maintenance, repair, and troubleshooting of the Imperial 5 speaker system.

1. Technical Specifications 2. System Overview 3. Installation Guidelines 4. Crossover Network 5. Driver Components 6. Cabinet Construction 7. Wiring Diagrams 8. Maintenance Procedures 9. Troubleshooting Guide 10. Parts List 11. Service Contacts

Technical Specifications

Complete technical specifications for the Marantz Imperial 5 speaker system.

Parameter	Specification
System Type	2-way bass reflex bookshelf speaker
Woofer	8-inch treated paper cone
Tweeter	1-inch soft dome
Impedance	8 ohms nominal
Power Handling	50-100 watts RMS
Frequency Response	45Hz - 20kHz (±3dB)
Sensitivity	89dB (2.83V/1m)
Crossover Frequency	2500Hz
Dimensions (HxWxD)	20" x 12" x 10"
Weight	18 lbs each

System Overview

Key components and design features of the Imperial 5 speaker system.

8-inch woofer with butyl rubber surround for extended bass response
1-inch ferrofluid-cooled dome tweeter for smooth high frequencies
Second-order crossover network with polypropylene capacitors
Bass reflex port tuned to 45Hz for enhanced low-frequency performance
5-way binding posts for secure cable connections
Walnut wood veneer cabinet with internal bracing

WARNING! Handle speakers with care; avoid dropping or impacting drivers.

Installation Guidelines

Proper installation procedures for optimal performance.

Place speakers on stable stands or shelves at ear level when seated
Position speakers 6-10 feet apart for stereo imaging
Keep speakers at least 1 foot from walls for proper bass response
Connect to amplifier using 16-gauge or thicker speaker wire
Ensure proper polarity: red to positive, black to negative terminals
Break-in period: Allow 20 hours of normal use for optimal performance

CAUTION! Ensure amplifier power matches speaker specifications.

Crossover Network

Crossover Type: Second-order Linkwitz-Riley design
Crossover Frequency: 2500Hz
Components: Air-core inductors, polypropylene capacitors
Slope: 12dB/octave for both high and low pass sections
Impedance Compensation: Zobel network on woofer circuit
Tweeter Protection: PTC resettable fuse

Driver Components

Detailed specifications and service information for individual drivers.

Woofer: 8-inch treated paper cone, 1.5-inch voice coil, butyl rubber surround, stamped steel basket, 30oz magnet structure.

Tweeter: 1-inch soft dome, ferrofluid cooling, neodymium magnet, aluminum voice coil, acoustic lens waveguide.

Replacement Procedures: Remove grille, unscrew driver mounting screws, disconnect wiring harness, install new driver, reconnect wiring.

Cabinet Construction

Internal cabinet design and construction details.

3/4-inch MDF construction with walnut wood veneer
Internal cross-bracing for reduced cabinet resonance
Acoustic damping material: 1-inch fiberglass batting
Bass reflex port: 2-inch diameter, 6-inch length
Removable rear panel for service access
Magnetic grille attachment system

Tip: Check cabinet seals regularly for air leaks.

Wiring Diagrams

Complete wiring schematics and connection diagrams.

Internal wiring: 16-gauge oxygen-free copper
Crossover to drivers: Color-coded connections
Binding post connections: Gold-plated 5-way posts
Polarity: Red positive, black negative throughout
Grounding: Common ground point on crossover board

WARNING! Disconnect from amplifier before performing any internal service.

Maintenance Procedures

Routine maintenance and cleaning procedures.

Cabinet cleaning: Use dry soft cloth only
Grille cleaning: Vacuum gently with brush attachment
Driver inspection: Check for cone damage or surround deterioration
Terminal cleaning: Use contact cleaner on binding posts
Port cleaning: Remove dust from bass reflex port
Visual inspection: Check for cabinet damage or loose components

WARNING! Do not use liquids or solvents on drivers or cabinet.

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
No sound from one speaker	Wiring/amplifier issue	Check speaker wires; test with known working speaker
Distorted sound	Overdriven/voice coil damage	Reduce volume; inspect voice coil for rubbing
No high frequencies	Tweeter failure/crossover issue	Test tweeter with multimeter; check crossover components
Weak bass response	Port blockage/woofer issue	Clear port obstruction; test woofer operation
Cabinet vibration	Loose components/internal bracing	Tighten all screws; check internal bracing

Note: Always disconnect from amplifier before troubleshooting.

Parts List

Replacement parts and component specifications.

Woofer Assembly: Part #IMP5-WFR-001
Tweeter Assembly: Part #IMP5-TWR-001
Crossover Board: Part #IMP5-XVR-001
Binding Posts: Part #IMP5-BND-001
Grille Assembly: Part #IMP5-GRL-001
Cabinet Veneer: Part #IMP5-VNR-001
Port Tube: Part #IMP5-PRT-001

Service Contacts

Marantz Imperial 5 technical support and service information.

Authorized Service Centers: Contact Marantz for nearest authorized service facility. Technical Support: Available Monday-Friday 9AM-5PM EST. Parts Ordering: Genuine Marantz parts only through authorized dealers.

Service: 1-800-MARANTZ; www.marantz.com/service

Warranty: 5-year limited warranty on drivers and components