Quantum Line Source vs Kappa 9
The Kappa 9's impedance is 5Ω against the Quantum Line Source's 4Ω, its low-frequency extension 29 Hz against 18 Hz, and its high-frequency extension 45 kHz against 32 kHz. Both share woofer (12").
AI-generated product photo — not official manufacturer imagery.
LoudspeakersFloorstanding SpeakersDiscontinued
About the Quantum Line Source
The Infinity Quantum Line Source QLS-1 is a large vintage 4-way, 17-driver floorstanding loudspeaker system introduced in 1976. It combines a 12-inch (300 mm) Watkins dual-voice-coil woofer, a dedicated midbass coupler, six 1.5-inch (38 mm) ventilated-dome midrange drivers, and nine EMIT high-frequency drivers arranged as a vertical line source, including one rear-firing unit. The system has a nominal 4-ohm impedance, crossover points at 200 Hz, 600 Hz, and 4 kHz, a specified frequency range of 18 Hz to 32 kHz, and is intended for amplifiers rated from 100 to 500 watts per channel. Each enclosure measures approximately 168 cm high, 46 cm wide, and 38 cm deep, and weighs about 86 kg. Its Watkins woofer, extensive EMIT array, and rear-firing high-frequency driver are characteristic of Infinity's early large-scale line-source designs.
Specifications
Transducer Specifications
Driver and acoustic performance characteristics
- Impedance
- 4Ω
- Frequency Response
- 18 Hz - 32 kHz
- Power Handling
- 500W
- Min. Amplifier Power
- 100W
- Max. Amplifier Power
- 500W
Speaker Design
Driver configuration and enclosure design
- Configuration
- 4-way
- Driver Type
- dynamic
- Driver Size
- 12"
- Driver Count
- 17
- Crossover Frequency
- 4.0 kHz
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 380 × 1670 × 450 mm (W × H × D)
Key Specifications
Impedance: 4Ω
Frequency: 18-32000 Hz
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions