6.2 Amplifier¶
6-channel Class-D marine amplifier with independent bridging for flexible speaker configuration.
Type: 6-Channel Marine Amplifier
Model: MS-AP61800
Part Number: 010-02284-65
Manufacturer: Fusion (Garmin)
Product Page: Fusion Apollo MS-AP61800
Manual: Installation Manual
Mounting: Cab side firewall (behind radio)
Power Source: CONSTANT bus via 100A breaker
Specifications¶
| Spec | Value |
|---|---|
| Total Power | 1800W rated |
| 6-Channel | 6x 150W RMS @ 4Ω |
| Bridged | 3x 580W RMS @ 4Ω |
| Class | D (high efficiency) |
| Fuse Rating | 125A electronic fuse |
| Current Draw Idle | 1.32A @ 14.4V in |
| Current Draw Max | 78A |
| Dimensions | 11.69" x 7.06" x 2.13" |
| Weight | 5.95 lbs |
| Waterproof | IPX2 |
| Operating Temp | 32°F to 122°F |
Channel Configuration¶
| Channel | Mode | Output | Load |
|---|---|---|---|
| Ch 1+2 | Bridged | 580W RMS | Subwoofer |
| Ch 3 | Stereo | 150W RMS | Front Left |
| Ch 4 | Stereo | 150W RMS | Front Right |
| Ch 5 | Stereo | 150W RMS | Rear Left |
| Ch 6 | Stereo | 150W RMS | Rear Right |
Protection Features¶
- Reverse voltage protection
- Input under/over voltage protection
- Over temperature protection
- Output short circuit protection
- Ignition Safety Protected (SAE J1171)
Bridge Adapters¶
Fusion includes bridge adapters with built-in magnets:
- Magnets trigger "High Power Mode" when bridging
- Adapters block unused speaker terminals
- Adapter blocks one RCA input for mono subwoofer
Wiring¶
| Connection | Wire | Source | Notes |
|---|---|---|---|
| Power (+) | 4 AWG | CONSTANT bus | Via 100A Blue Sea breaker |
| Ground (−) | 4 AWG | AUX battery (−) | Direct to terminal |
| Remote | 18 AWG | MS-RA670 | Turn-on signal |
| RCA Zone 1 | Shielded | MS-RA670 | Ch 3+4 (front) |
| RCA Zone 2 | Shielded | MS-RA670 | Ch 5+6 (rear) |
| RCA Sub | Shielded | MS-RA670 | Ch 1+2 (bridged) |
Circuit Protection¶
Amplifier has 125A internal electronic fuse (no replacement necessary). External protection at CONSTANT bus:
- Breaker: Blue Sea 187-100A (100A) thermal circuit breaker
- Protects 4 AWG wiring (rated 95A continuous, 100A with short runs)
- Mount at CONSTANT bus in passenger wheel well
Mounting Location¶
Cab side firewall (behind radio)
- Shortest RCA runs from head unit
- Central location for speaker wire routing
- Power/ground run ~8-10 ft to AUX battery in passenger wheel well
- Adequate ventilation for Class-D efficiency