Choosing the right amplifier is crucial for unleashing the full potential of Stealth Acoustics speaker systems. These invisible speakers deliver exceptional sound quality while maintaining the aesthetic integrity of your space, but they require proper amplification to achieve optimal performance.
Power and Performance: The SA2400-MKII
The SA2400-MKII stands as Stealth Acoustics' flagship amplifier, delivering an impressive 400W per channel at 8 ohms. This powerhouse is specifically engineered for premium installations using the LRX series speakers, particularly the award-winning LRX-83 and LRX-85 models. Its sophisticated DSP processing and network control capabilities make it perfect for fine-tuning speaker response in challenging acoustic environments.
Key Technical Specifications:
400W per channel at 8 ohms, 600W at 4 ohms
Frequency response: 20Hz - 20kHz (±0.5dB)
THD+N: Less than 0.05% at rated power
Signal-to-noise ratio: Greater than 100dB
Advanced DSP with custom presets
Network control and monitoring
Multiple input options: XLR, RCA, and digital
The SA2400-MKII excels when paired with high-end installations, capable of driving multiple L-RAD 430 speakers in parallel while maintaining pristine sound quality. For home theater applications, it provides the necessary headroom for dynamic movie soundtracks while ensuring clear dialogue reproduction through the invisible speakers.
Versatile Solution: The SA255-MKII
For smaller installations and residential applications, the SA255-MKII offers the perfect balance of power and efficiency. Delivering 250W per channel at 8 ohms, this compact amplifier pairs beautifully with the L-RAD 116 and LR3g speakers in medium-sized rooms.
Technical Highlights:
250W per channel at 8 ohms, 400W at 4 ohms
Frequency response: 20Hz - 20kHz (±1dB)
THD+N: Less than 0.1% at rated power
Signal-to-noise ratio: Greater than 95dB
Basic EQ controls
XLR and RCA inputs
Efficient Class D design
Amplifier Comparison
Specification | SA2400-MKII | SA255-MKII |
Power Output (8Ω) | 400W per channel | 250W per channel |
Power Output (4Ω) | 600W per channel | 400W per channel |
Frequency Response | 20Hz - 20kHz (±0.5dB) | 20Hz - 20kHz (±1dB) |
THD+N | <0.05% at rated power | <0.1% at rated power |
Signal-to-Noise | >100dB | >95dB |
Damping Factor | >200 | >150 |
Optimal Speaker-Amplifier Combinations
For the SA2400-MKII:
Up to two LRX-83 speakers in full-range stereo
Multiple L-RAD 430 speakers for commercial installations
LRX-85 pairs for premium home theater setups
Combined indoor/outdoor systems with Stingray 8 speakers
For the SA255-MKII:
L-RAD 116 stereo pairs
Single B22g subwoofer integration
LR3g speakers in medium rooms
Stingray 6 outdoor speaker systems
Installation Considerations
Both amplifiers require professional installation to achieve optimal performance. Critical factors include:
Proper ventilation and rack mounting
Correct speaker wire gauge selection
Balanced versus unbalanced input configuration
DSP setup and calibration
Integration with control systems
The choice between these amplifiers ultimately depends on your specific installation requirements, room size, and chosen speaker models. For most residential installations using standard invisible speakers, the SA255-MKII provides ample power and features. However, for premium installations using the LRX series or large commercial spaces, the SA2400-MKII's additional power and advanced features make it the ideal choice.
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