Cicada Audio FLX2500.1 — Ultra-High-Power 1-Channel Class-D Motorcycle Subwoofer Amplifier (2,500W RMS @ 2Ω)
| Channels | 1 Channel |
| Power | 2500W RMS |
| Year Range | 1998-2013, 2014-2023, 2024+ |
2,500W mono. Serious sub output in the compact FLX chassis.
The Cicada Audio FLX2500.1 is a high-output mono Class-D amplifier built for Harley-Davidson Touring — delivering 2,500W RMS at 2Ω in the compact FLX chassis format, with HPF and LPF crossover covering 10 Hz – 20 kHz. The step up from the FLX1600.1 for builds where maximum subwoofer or mid-bass output is the design objective. Requires a lithium battery upgrade and 2 AWG power wiring.
The FLX1600.1 delivers 1,600W mono with a standard 4 AWG install. The FLX2500.1 delivers 2,500W from the same compact chassis footprint — but the extra output demands more from the electrical system. A lithium battery is required to sustain the current draw without voltage sag at rated output, and 2 AWG is the minimum wire gauge for the power run. For builds where the electrical infrastructure is already committed and maximum subwoofer authority is the objective, the FLX2500.1 is the correct step up.
Who This Is For
For riders who have committed to the electrical infrastructure required and are building the highest-output mono stage the compact FLX chassis delivers. The FLX2500.1 is the step up from the FLX1600.1 for builds where 1,600W is the ceiling that needs to be broken — and where a lithium battery upgrade is already part of the plan. For builds requiring maximum output at any infrastructure cost, the BFA5000.1 delivers 5,000W at 2Ω.
What This Is Best For
- Maximum-output subwoofer builds in compact enclosures — 2,500W at 2Ω drives a high-excursion subwoofer at the output levels where it was designed to operate. For saddlebag, Tour-Pak, or custom lower fairing enclosures where driver excursion is the limiting factor, this is the power supply.
- High-output mid-bass builds requiring sustained mono power — a purpose-built mid-bass enclosure in a saddlebag or Tour-Pak needs sustained high-current mono output, not bridged output from a 4-channel amp. The FLX2500.1 provides that from a dedicated channel at levels the FLX1600.1 cannot reach.
- Step up from the FLX1600.1 in an existing multi-amp build — for builds already running a 4-channel amp plus a mono amp where the sub output needs to increase, the FLX2500.1 is the direct replacement for the FLX1600.1 when the electrical infrastructure is upgraded to match.
- Builds with lithium battery upgrades already in place — the FLX2500.1's current demand makes a lithium battery mandatory. For builds where that upgrade is done, the FLX2500.1 uses the available current capacity correctly.
Lithium Battery Upgrade and 2 AWG Wiring Required
The FLX2500.1 requires a lithium battery upgrade and 2 AWG power and ground wiring from the supply to the amplifier. A standard factory Harley lead-acid battery cannot sustain the current demand of this amplifier at rated output. A 150A fuse is required on the power feed. Verify total system current load against the charging system's output before finalising the install.
The Bottom Line
2,500W mono in the compact FLX chassis — the step up from the FLX1600.1 for builds that have committed to the electrical infrastructure and need more sub output.
Ready to upgrade? Add to cart above. For the same mono output at a lower infrastructure requirement, the FLX1600.1 delivers 1,600W with 4 AWG wiring and no lithium requirement. For maximum mono output beyond this level, the BFA5000.1 delivers 5,000W at 2Ω.
Power Output — What the Numbers Mean
The FLX2500.1 is rated at 2,500W at 2Ω at 14.4V — a fully charged, engine-running system with a lithium battery supplying clean, stable voltage at load. A lithium battery is important here specifically because it maintains voltage closer to the 14.4V rated condition under the sustained current draw of a mono amp at high output, where a lead-acid battery would sag and reduce actual output below the rated figure.
No separate 4Ω rating is published for the FLX2500.1. For builds running a 4Ω subwoofer, the FLX1600.1 provides dual-impedance ratings and may be the more appropriate match depending on the driver specification.
Crossover and Signal Control
The FLX2500.1 runs HPF and LPF crossover modes with a fixed 12 dB per octave slope. The HPF range covers 10–80 Hz — used as a subsonic filter protecting the driver from excursion below its usable frequency range. The LPF range covers 80 Hz – 20 kHz, providing the main crossover point for sub and mid-bass channel integration.
The LPF extending to 20 kHz allows the FLX2500.1 to operate as a full-range mono amplifier when the LPF is not engaged — relevant for custom single-driver builds or high-output single-channel applications outside of dedicated subwoofer use.
Input sensitivity runs 0.2V – 12V, covering OEM Harley signal levels, standard RCA from aftermarket head units, and DSP pass-through line-level outputs.
System Integration
The FLX2500.1 accepts high-level speaker output from the factory Harley Boom! Box radio directly — no additional converter required for 2014–2023 models — or low-level RCA from any aftermarket head unit or DSP pass-through output.
Turn-on supports REM and DC offset modes. At 80A music-level current draw, the FLX2500.1 requires a lithium battery to sustain clean output at volume. Maximum draw is 260A; a 150A fuse is required on the power feed. For dual-amp installs adding the FLX2500.1 alongside a 4-channel amp, calculate total system current draw against the charging system's output before finalising the design.
2024+ Platform Notes
For 2023.5 CVO and 2024+ Harley-Davidson Touring models running Skyline OS, the FLX2500.1 can be integrated as part of an aftermarket audio system when paired with a NAV-TV ZEN-H or ZEN-H Pro upstream in the signal chain. Without a ZEN-H or ZEN-H Pro, integration with a 2023.5 CVO or 2024+ Harley is not supported. For 2014–2023 models (excluding 2023.5 CVO), the high-level input connects directly to the factory Boom! Box radio.
Fitment
- Harley-Davidson Street Glide: Fairing amp tray or custom enclosure position.
- Harley-Davidson Road Glide: Fairing amp tray or custom enclosure position.
- Harley-Davidson Ultra Limited / Ultra Classic: Fairing amp rack or Tour-Pak position.
- Harley-Davidson CVO models: Fairing amp rack or Tour-Pak position (see 2024+ note above for Skyline OS bikes).
- Harley-Davidson Trike: Compatible — fairing, trunk, or saddlebag amp rack positions.
- Compatible with OEM Boom! Box radios (high-level input), all aftermarket head units (high-level or RCA), and DSP pass-through line-level outputs.
- Requires lithium battery upgrade and 2 AWG power and ground wiring.
Technical Specifications
| Channels | 1-Channel (Mono) |
| Amplifier Class | Class D |
| Power Output — 2Ω @ 14.4V | 2,500W RMS |
| Efficiency | 80% |
| Signal-to-Noise Ratio | 86 dB |
| THD + N | 0.1% (10% rated power) |
| THD | <0.5% |
| Damping Factor | 200 |
| Frequency Response | 10 Hz – 20 kHz (±3 dB) |
| HPF Range | 10 Hz – 80 Hz |
| LPF Range | 80 Hz – 20 kHz |
| Crossover Slope | 12 dB per octave |
| Input Sensitivity | 0.2V – 12V |
| Inputs | High-level or Low-level RCA |
| Turn-On Modes | REM / DC Offset |
| Operating Voltage | 9V – 16V |
| Current Draw (Music) | 80A |
| Current Draw (Maximum) | 260A |
| Recommended Fuse | 150A |
| Minimum Power Wire Gauge | 2 AWG |
| Battery Requirement | Lithium battery upgrade required |
| Weather Resistance | Outdoor-rated — moisture and vibration resistant |
| Dimensions | 234 × 124 × 51 mm (9.2 × 4.9 × 2.0 in) |
Australia Shipping:
- Under $500 → $19.95
- $500–$2,500 → $14.95
- Over $2,500 → FREE
- Bulky items → +$24.95 surcharge (waived over $2,500)
Fast dispatch from Brisbane. Same-day shipping on in-stock orders before 1pm AEST.
Change-of-mind returns: We accept returns within 7 days of delivery on unused, unopened products in original sealed packaging. Restocking fees apply (20–30%). Return shipping is the customer's responsibility.
No returns on opened audio gear, installed items, custom orders, or special-order products. Please check fitment carefully before installing.
Faulty or incorrect items: If you experience an issue, contact us with photos/video and your order number. We'll assess the claim and arrange repair, replacement, or refund for verified faults under the Australian Consumer Law.
Fitment assistance: If you're unsure about compatibility, reach out before ordering—we're happy to help.