A400 vs Monitor Audio Silver 9i
The Silver 9i's sensitivity is 91 dB against the A400's 88 dB and its impedance 8Ω against 4Ω. Both share high-frequency extension (25 kHz) and ways (2).
AI-generated product photo — not official manufacturer imagery.
LoudspeakersFloorstanding SpeakersDiscontinued
About the A400
The Boston Acoustics A400 is a mid-1980s floorstanding loudspeaker that uses a wide, very shallow cabinet designed to sit close to or flat against the rear wall. It is a three-way, acoustic-suspension design with a single 1" tweeter, one 6" midrange driver, and two 8" woofers, with the combined cone area intended to approximate that of a single 12" woofer. The cabinet is roughly 41" high, 21" wide, and about 7.25" deep, and each speaker weighs around 65 lb. Nominal impedance is 4 ohms, rated sensitivity is about 88 dB, and specified frequency response extends to roughly 38 Hz-25 kHz. The A400 was the top-of-the-line model in Boston Acoustics' original A-series, noted for its strong off-axis performance and balanced highs and mids when properly driven by a robust amplifier.
Specifications
Transducer Specifications
Driver and acoustic performance characteristics
- Sensitivity
- 88 dB SPL @ 1W/1m
- Impedance
- 4Ω
- Frequency Response
- 38 Hz - 25 kHz
Speaker Design
Driver configuration and enclosure design
- Configuration
- 2-way
- Driver Type
- dynamic
- Driver Size
- 8"
- Driver Count
- 4
- Enclosure Type
- ported
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 533.4 × 1041.4 × 184.15 mm (W × H × D)
- Weight
- 29.48 kg (65 lbs)
Key Specifications
Sensitivity: 88 dB
Impedance: 4Ω
Frequency: 38-25000 Hz
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions