The Royal 400 vs Infinity SM 155
The SM 155's low-frequency extension is 29 Hz against the The Royal 400's 30 Hz and its high-frequency extension 27 kHz against 20 kHz. Both share impedance (8Ω) and ways (3).
AI-generated product photo — not official manufacturer imagery.
The Royal 400
Electro-VoiceLoudspeakersFloorstanding SpeakersDiscontinued
Estimated price (community-sourced)
$1,000
Around — community and catalog average, updates slowly
About the The Royal 400
The Electro-Voice The Royal 400 is a 3-way low-resonance ultra-compact loudspeaker system constructed with fine hardwood veneers and heavy vibration-free 3/4" panels for unusual rigidity. It features an 18" woofer (model 18WS), an 8" extended range midrange driver, and a T35 compression horn tweeter. The system is bi-ampable and designed to provide exceptionally wide frequency response from 30 Hz to 20,000 Hz. Power handling is rated at 30 watts maximum from 30-2500 Hz and 5 watts maximum from 2500-20,000 Hz, with a maximum undistorted output from a 70 watt amplifier on complex program signals. The cabinet dimensions are approximately 32" tall, 22" wide, and 15" deep. The crossover network uses L-pads for level adjustment, and the woofer has an 8 ohm nominal impedance with a 4 lb 10 oz ceramic magnet. The speaker system was highly regarded in the 1960s for its sound quality and is suitable for large rooms and tube amplifier systems.
Specifications
Transducer Specifications
Driver and acoustic performance characteristics
- Impedance
- 8Ω
- Frequency Response
- 30 Hz - 20 kHz
- Power Handling
- 30W
- Max. Amplifier Power
- 70W
Speaker Design
Driver configuration and enclosure design
- Configuration
- 3-way
- Driver Type
- dynamic
- Driver Size
- 18"
- Driver Count
- 3
- Enclosure Type
- sealed
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 559 × 813 × 381 mm (W × H × D)
- Available Colors
- Fine hardwood veneers
Key Specifications
Impedance: 8Ω
Frequency: 30-20000 Hz
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions