All guides · Navigation and electronics
I would start with where you want to listen to music and how you want to be able to control the volume. Then, select the stereo, speakers, and any amplifier as a complete solution.
Plan the zones before the wattage
Do you need music in the salon, cockpit, or both? Should they be able to play at different volumes? Make a sketch of the speaker locations and a list of your desired audio sources, such as a phone and radio.
Fusion offers zone control on relevant models. The number of zones, amplified outputs, and line outputs varies, so the features must be checked for the specific stereo. A zone designation does not necessarily mean that an extra built-in amplifier is included.
| Specification | How I use it |
|---|---|
| RMS per channel | Compare amplifier and speaker under the stated conditions. |
| Peak power | Do not use it as a replacement for RMS when comparing. |
| Impedance in ohms | Check the total load on each channel. |
| Mounting dimensions | Measure cutout, outer diameter, depth, and cable space. |
| Environment and location | Check the product's requirements for moisture, ventilation, and water exposure. |
Is a separate amplifier needed?
A stereo with suitable built-in outputs can cover minor needs. A separate amplifier might be relevant for more speakers, a subwoofer, or other power requirements. It also introduces space, cables, fuses, and power consumption, which must be included in the budget.
Garmin's Fusion guides describe requirements for channel load and setup. Connecting two speakers to one output or bridging must be explicitly permitted for the combination. I would get a channel overview included in the quote.
Calculation example: music for an afternoon
If the total system is measured at an average of 4 A from a 12 V battery, four hours of playback will consume approximately 16 Ah. This is a calculation example, not a consumption figure for a specific Fusion model. Music, volume, and setup change the consumption.
Space and installation affect the result
Examine the area behind the speaker before cutting, and follow its mounting requirements. Place the amplifier so that heat can escape and connections can be inspected. Marine-grade equipment must still be installed according to its ingress protection rating and manual.
Finally, ensure levels and any filters or DSP profiles are set correctly. A system with suitable components and a sensible setup is easier to use than a purchase driven by the highest total wattage.
Sources and manufacturer documentation
Manufacturer documentation checked September 2026. Always follow the manual for the specific model and installation. The calculation examples are simplified examples for planning purposes.
Proceed with your solution
Send your desired listening areas, number of speakers, and any existing Fusion model, and I will help you put the system together.