

Synergy Audio SYN Series 150.4D 4-Channel Amplifier — 150W x 4 RMS
Many in-stock orders ship within 1-2 business days, but timing varies by item. Custom, built-to-order, oversized, special-order and supplier-direct products may need extra processing time. Free shipping applies to qualifying orders over $99 in the contiguous US. Approved returns may be subject to a restocking fee.
Most products are covered by the manufacturer's warranty against defects. Damage from over-powering or improper installation isn't covered — we'll help coordinate any valid claim.
Tell us your vehicle, subwoofers and electrical setup and our team will help you match the right gear. Reach out before you buy.
Subwoofer Wiring Diagram
Select your configuration to view possible wiring combinations.
Loading wiring diagrams…
Diagrams are on our wiring diagram page.
The Synergy Audio SYN 150.4D is a world-class four-channel amplifier built with premium components for uncompromising performance. Samyoung capacitors, Texas Instruments op-amps, German WIMA film capacitors and Fairchild chipsets deliver years of reliable power, whether you run a daily driver, a ground-pounding demo build, or the SPL lanes.
Full active control with a x10 frequency multiplier gives you total flexibility over your crossovers and tuning.
Specifications
| Power @ 4 Ohm | 150W x 4 @ 14.4V |
| Power @ 2 Ohm | 230W x 4 @ 14.4V |
| Power @ 4 Ohm Bridged | 450W x 2 @ 14.4V |
| Frequency Response | 20Hz – 20kHz |
| THD @ 4 Ohm | 0.1% |
| Signal to Noise Ratio | >85 dB |
| Damping Factor | >200 |
| Subsonic Filter | 10Hz – 50Hz |
| Low Pass Filter | 35Hz – 250Hz |
| High Pass Filter | x1 20Hz – 800Hz / x10 200Hz – 8kHz |
| Power/Ground Terminals | 4 GA |
| Working Voltage | 16V |
| Dimensions | 9.45" L x 9.45" W x 2.44" H |
Features
- Custom high-mass, thermally optimized aluminum heat sink casing
- Overbuilt power supply and output sections with high-grade components
- Heavy-duty double-sided through-hole PCB with thick solid copper traces
- Nickel-plated locking Tiffany RCA inputs/outputs
- Single 1/0 and 4 gauge nickel-plated power and ground inputs
- Nickel-plated 8 gauge speaker outputs
- Input sensitivity 6V – 200mV
- +18dB remote gain control with power and clipping indicators
- Multi-way fully intelligent protection circuitry
JS Ultimate Sounds is an authorized Synergy Audio dealer. Every product is 100% genuine and backed by full manufacturer warranty. Questions about fitment, wiring, or building your system? Our car-audio experts are here to help — reach out any time.


