SD502 vs Audio Physic Caldera
The Caldera's sensitivity is 90 dB against the SD502's 86 dB. Both share impedance (4Ω), high-frequency extension (40 kHz), and ways (3).
AI-generated product photo — not official manufacturer imagery.
LoudspeakersFloorstanding Speakers
Estimated price (community-sourced)
$5,780
Around — community and catalog average, updates slowly
About the SD502
Usher Audio SD-502 is a floorstanding, three-way bass-reflex loudspeaker designed for precise time alignment and high-resolution playback. It uses Usher’s 1.25-inch DMD diamond-diaphragm tweeter, a dedicated midrange driver, and dual 5.5-inch bass drivers to improve dispersion, reduce distortion, and strengthen low-frequency performance. The cabinet is heavily braced and the crossover uses air-core inductors, high-quality capacitors, and oxygen-free copper wiring. The model is listed by dealers at a retail price of 69,000 NOK, while broader availability appears limited, suggesting it is not an actively current mainstream model.
Specifications
Transducer Specifications
Driver and acoustic performance characteristics
- Sensitivity
- 86 dB SPL @ 1W/1m
- Impedance
- 4Ω
- Frequency Response
- 43 Hz - 40 kHz
- Power Handling
- 80W
Speaker Design
Driver configuration and enclosure design
- Configuration
- 3-way
- Driver Type
- dynamic
- Driver Size
- 5.5"
- Driver Count
- 3
- Enclosure Type
- ported
- Crossover Frequency
- 2.4 kHz
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 235 × 1020 × 360 mm (W × H × D)
- Weight
- 23.5 kg (52 lbs)
Key Specifications
Sensitivity: 86 dB
Impedance: 4Ω
Frequency: 43-40000 Hz
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions