Fusion sells three Apollo amplifiers named 1200, 1800, and 2400, and it's natural to read that as a power ladder, more watts as the number climbs. Check the actual spec sheets and the real story is different: all three deliver the identical 150W RMS per channel at 4-ohm. The number in the name is total peak wattage across all channels, and it climbs because the channel count does, 4, 6, then 8, not because any single channel gets more powerful.
There's also a fourth Fusion amp, the compact Zone Amp, that isn't part of this naming pattern at all.
The Apollo Lineup, Decoded
| Model | Price | Channels | RMS @ 4-Ohm (per channel) | Peak Power (Name) |
|---|---|---|---|---|
| Apollo 1200 | $749.00 | 4 | 150W | 1,200W total |
| Apollo 1800 | $899.99 | 6 | 150W | 1,800W total |
| Apollo 2400 | $1,099.99 | 8 | 150W | 2,400W total |
Key Takeaways
- All three Apollo amps deliver identical 150W RMS per channel at 4-ohm, the model number tracks channel count times 150W peak, not a power upgrade.
- Choose between them purely by how many speakers and subs you need to drive: 4, 6, or 8 channels.
- All three carry an IPX2 water rating, notably lower than the IPX7 rating common on many other marine amps, worth checking closely before an exposed install.
- The Zone Amp is a separate, much smaller product: a 2-channel, 20W RMS per channel unit built specifically to extend a Fusion DSP stereo into an additional zone, not a standalone system amp.
- All three Apollo amps include high-power bridging adapters, letting you combine channels for a subwoofer without a separate mono amp.
Why the Name Doesn't Signal More Power Per Speaker
If you assumed the Apollo 2400 hits harder per speaker than the 1200 because of the bigger number, that's not what the spec sheet shows, both deliver 150W RMS per channel at 4-ohm. The 2400 simply has twice as many channels (8 vs 4), so its total peak wattage figure is twice as large. If your build only needs 4 channels, the 1200 delivers the same per-channel output as the 2400 at a third of the channel count and a meaningfully lower price.
Browse the full Fusion amplifier lineup →
Feature Walkthrough
Apollo 1200 / 1800 / 2400
150W RMS per channel at 4-ohm, 290W RMS per channel at 2-ohm, 580W RMS bridged pairs at 4-ohm, across 4, 6, or 8 channels respectively. Class-D design, IPX2 water rating, and Fusion's automatic power/audio adjustment features built in.
Zone Amp (140W)
2 channels, 20W RMS per channel at 4-ohm, 30W RMS at 2-ohm, IPX7-rated, purpose-built to extend an existing Fusion DSP-enabled stereo and speaker setup into a new zone, not a full-system amplifier.
The Water Rating Gap Worth Knowing About
The Apollo 1200/1800/2400 carry an IPX2 rating, which protects against dripping water at an angle, a meaningfully lower protection level than the IPX7 rating (protection against temporary submersion) common on many other marine amps. The compact Zone Amp, by contrast, is IPX7-rated. If your amp will be mounted somewhere exposed to spray or splash rather than a dry, protected compartment, this is worth checking closely before choosing an Apollo amp based on channel count alone.
How to Actually Choose
Start with your channel count: 4 speakers (or fewer, using bridging for a sub) points to the 1200, 6 to the 1800, 8 to the 2400. Per-channel power is identical across all three, so there's no power-tier tradeoff to weigh. If you're adding one zone to an existing Fusion DSP stereo setup rather than building a full amplified system, the Zone Amp is the more direct and cheaper answer. Confirm your mounting location's exposure to water before finalizing an Apollo amp choice given its IPX2 rating.
Honest Cons
IPX2 is a real limitation for an amp marketed for marine use. Plan for a dry, protected mounting location, not an exposed one.
The naming convention invites a reasonable but incorrect assumption that a bigger number means more power per speaker. Check channel count and per-channel RMS directly, not just the model name.
The Zone Amp's 20W RMS per channel is modest, appropriate for a small additional zone, not a primary speaker pair needing real output.
Frequently Asked Questions
Is the Apollo 2400 more powerful than the 1200?
Not per channel, both deliver 150W RMS at 4-ohm. The 2400 simply has more channels (8 vs 4), which is why its total peak wattage number is higher.
Can the Zone Amp replace one of the Apollo amps?
No, it's built specifically as a zone-expansion add-on for an existing Fusion DSP stereo setup, with far less power (20W RMS per channel) than any Apollo model.
Are these amps safe to mount somewhere exposed to spray?
The Apollo 1200/1800/2400's IPX2 rating is not built for that; a dry, protected mounting location is the safer choice for these specific amps.
How do these compare to JL Audio's amplifiers?
See our direct Fusion vs. JL Audio comparison at a matched power tier.
Bottom Line
Fusion's Apollo 1200, 1800, and 2400 are the same amp scaled by channel count, not a power ladder. Pick by how many channels you need, and factor in the IPX2 rating before choosing a mounting location.