The SolidDrive SD250 is a compact 2-channel Class D amplifier designed specifically to power SolidDrive surface-mount audio transducers. Delivering 50 watts per channel into 4 ohms, the SD250 provides the power and signal processing needed to turn wood, glass, drywall, and other solid surfaces into sound sources.
Built-in selectable EQ settings optimize the amplifier for different surface materials, helping compensate for the acoustic characteristics of wood, glass, drywall, and other flat mounting surfaces. This makes the SD250 an ideal amplifier for hidden audio, architectural audio, immersive sound, and sound masking applications.
50W Per Channel Class D Amplification
The SD250 delivers 50 watts per channel at 4 ohms, providing ample power for SolidDrive transducers while maintaining a compact footprint.
Its Class D amplifier design provides efficient operation in a small aluminum chassis, making it suitable for installations where space is limited.
The amplifier can operate in three configurations:
- Stereo — independent left and right channels
- Dual mono — both channels operate as separate mono outputs
- Bridged mono — combines the amplifier channels for a single higher-power output
Built-In EQ for Solid Surface Applications
Unlike a conventional amplifier, the SD250 includes selectable equalization designed for planar-source audio applications.
EQ settings can be selected to optimize performance when SolidDrive transducers are mounted to different materials, including:
- Wood
- Glass
- Drywall
- Flat surfaces
This allows the amplifier to compensate for differences in the way various surfaces respond to the transducer, helping create more consistent and natural-sounding audio.
Designed for SolidDrive Transducers
The SD250 is compatible with SolidDrive actuators including the SD1, SD1G, SD1SM, and MSK-1.
SolidDrive transducers transfer audio energy directly into a mounting surface rather than using a conventional visible loudspeaker cone. The result is an unobtrusive audio solution where the listening surface itself becomes the sound source.
This makes the SD250 particularly useful when traditional speakers are undesirable or when a completely integrated architectural audio system is required.
Flexible Audio Inputs
The SD250 provides multiple input options for connecting professional and consumer audio equipment.
Input connections include:
- Balanced stereo Euroblock input
- Unbalanced mini-jack input
- High-level Euroblock input
This flexibility allows the amplifier to be integrated into a variety of commercial audio systems without requiring additional input-conversion equipment.
Energy-Efficient Operation
An external 12–32V trigger input allows the SD250 to be remotely controlled as part of an integrated audio system.
The amplifier also features signal-detecting automatic standby, which reduces power consumption when no audio signal is present. The amplifier automatically returns to operation when an audio signal is detected.
Independent Channel Control
Dual concentric gain controls allow the two amplifier channels to be adjusted independently while maintaining the SD250's compact form factor.
This is useful when left and right channels require different output levels or when the amplifier is operating in a dual-mono configuration.
Compact Aluminum Design
The SD250 uses a compact aluminum enclosure measuring approximately 1.2" x 3.9" x 4", making it easy to install in locations where a conventional power amplifier would be too large.
An optional AC-SA502-RMA rack-mount adapter kit is available for rack-based installations.
Applications
The SolidDrive SD250 is ideal for:
- Hidden audio installations
- Architectural audio
- Invisible loudspeaker systems
- Immersive audio installations
- Commercial sound masking
- Residential sound masking
- Retail environments
- Hospitality installations
- Museums and exhibits
- Interactive displays
- Wood and glass audio installations
- Planar-source audio systems
Key Features
- 50W per channel at 4 ohms
- Class D amplifier design
- 34 dB maximum gain
- Built-in selectable surface EQ
- EQ settings for wood, glass, drywall, and flat surfaces
- Stereo, dual-mono, and bridged-mono operating modes
- Balanced stereo Euroblock input
- Unbalanced mini-jack input
- High-level Euroblock input
- Dual concentric gain controls
- 12–32V external trigger input
- Signal-detecting automatic standby
- 20Hz–20kHz frequency response
- Compact aluminum enclosure
- Compatible with SolidDrive SD1, SD1G, SD1SM, and MSK-1 transducers
- Optional AC-SA502-RMA rack-mount adapter
Specifications
Amplifier Type | Class D |
Output Power | 50W per channel at 4 ohms |
Maximum Gain | 34 dB |
Operating Modes | Stereo, Dual Mono, Bridged Mono |
Frequency Response | 20Hz–20kHz |
Inputs | Balanced stereo Euroblock, unbalanced mini-jack, high-level Euroblock |
Trigger Input | 12–32V |
Standby | Signal-detecting automatic standby |
EQ | Selectable surface-specific EQ |
Dimensions | 1.2" x 3.9" x 4" |
Enclosure | Aluminum |
Optional Accessory | AC-SA502-RMA rack-mount adapter |
Why Choose the SolidDrive SD250?
The SolidDrive SD250 combines dedicated surface-transducer amplification, selectable EQ, flexible input connections, and multiple operating modes in an exceptionally compact amplifier.
For installations where conventional loudspeakers are visually undesirable, the SD250 provides the specialized amplification needed to create hidden or architectural audio systems using SolidDrive transducers. Its surface-specific EQ and efficient Class D design make it especially well suited to residential and commercial installations where both audio performance and discreet integration are important.
