Cicada Audio CXX57.4 — 5×7" 4Ω Boom! II Bi-Amp Coaxial Harley Saddlebag Speakers (Pair)
| Size | 5x7 · Coaxial |
| Impedance | 4 Ohm |
| Power | 125W RMS |
| Year Range | 1998-2013, 2014-2023 |
| Location | Saddlebags |
The CVO Boom! Stage II replacement for bridged-amp and conservative builds.
The CXX57.4 is Cicada's Pro-series 5×7" bi-ampable coaxial — a direct plug-in replacement for Harley-Davidson CVO Boom! Stage II rear speakers, with a 4Ω woofer for bridged-amp compatibility, Kevlar cone, N45H neodymium motor, 125W RMS, V8™ Dispersion Guide, and Rain or Shine™ weatherproof construction. Runs as a full-range coaxial or in true bi-amp mode with independent woofer and tweeter channels. Sold in pairs.
CVO Touring models with Boom! Stage II use bi-amped rear speakers — separate amplifier channels for the woofer and tweeter, running through a bi-amp wiring harness. Most aftermarket 5×7" speakers are not wired for this. The CXX57.4 is: independent woofer and tweeter inputs match the OEM Boom! Stage II harness architecture directly, with a switchable crossover for standard coaxial operation on non-CVO bikes. The 4Ω woofer is the correct choice for bridged-amp configurations and systems where a 4Ω minimum load is required.
Who This Speaker Is For
For CVO Touring riders running a bridged-amp rear stage or conservative system design — pull out the factory Boom! Stage II speakers, plug in the CXX57.4, and gain Kevlar cone construction, N45H motor, V8™ Dispersion Guide, and 125W RMS handling. No rewiring, no adapters, no compromises. Also runs as a standard coaxial on any Touring model with a 5×7" rear position. For maximum power extraction from a dedicated 2Ω-rated amplifier in stereo, the CXX57.2 is the 2Ω variant.
What This Is Best For
- CVO Boom! Stage II direct replacement with 4Ω compatibility — the bi-ampable wiring terminals match the OEM Stage II harness exactly. Pull out the factory speakers, plug in the CXX57.4. Kevlar cone, N45H motor, V8™ Dispersion Guide, and 125W RMS replace the factory CVO drivers. The 4Ω woofer is the correct choice when the rear amplifier channels are bridged.
- Bridged rear stage builds on CVO models — when the rear amplifier channels are bridged for higher per-channel output, a 4Ω speaker is the correct load. Bridging halves the impedance the amp sees — a 4Ω speaker bridged presents a 2Ω load, within safe operating range for most quality amplifiers. The CXX57.4 is the CVO Boom! Stage II replacement for this configuration.
- DSP-tuned bi-amp systems — with independent woofer and tweeter channels, the CXX57.4 allows separate gain, EQ, and crossover control over the two drivers through a DSP processor. The 4Ω woofer reduces current demand on the amplifier in sustained DSP-tuned operation.
- Standard coaxial builds on non-CVO Touring models — the switchable crossover allows the CXX57.4 to run as a full-range coaxial from a single amplifier channel on any compatible 5×7" position. Pairs well with CXX65.2 or CXX65.4 fairing speakers for a matched Pro-series front and rear stage.
Bi-Amp Mode vs Coaxial Mode
The CXX57.4 has two sets of input terminals — one for the woofer (4Ω), one for the tweeter (4Ω). In bi-amp mode, each driver is powered by a separate amplifier channel, matching the Boom! Stage II wiring architecture. In coaxial mode, the built-in 6dB crossover is engaged and both drivers run from a single channel — the standard setup for non-CVO Touring models. The mode switch is built into the speaker assembly. For maximum output from a 2Ω-rated amplifier at rated stereo output, choose the CXX57.2 (2Ω woofer).
The Bottom Line
A true drop-in for Harley-Davidson CVO Boom! Stage II rear speakers — Kevlar cone, N45H neodymium motor, 125W RMS, V8™ Dispersion Guide, 4Ω woofer for bridged-amp configurations and conservative builds, switchable bi-amp/coaxial modes. Rain or Shine™ weatherproof. Grills and mounting hardware included.
Ready to upgrade your CVO rear stage? Add to cart above. For maximum output from a 2Ω-rated amplifier running stereo, the CXX57.2 is the 2Ω variant.
What's Inside the CXX57.4
The cone is Kevlar — the woven aramid fibre chosen for its low mass, high stiffness, and moisture resistance. In a 5×7" driver operating inside a saddlebag lid or rear pod, dimensional stability across the temperature range of a motorcycle environment matters as much as it does in the larger CXX formats. At 125W RMS, a stiff Kevlar cone maintains its shape at the excursion levels this driver is rated for. On the road: cleaner, more controlled output at volume — particularly noticeable in the upper midrange where less controlled cones begin to break up.
The N45H neodymium motor drives a 1.4-inch mid-bass voice coil — stronger magnetic flux density than the N35 in the CX range, with the H-grade temperature rating for sustained thermal stability. The stronger motor gives better voice coil control at the power levels the CXX57.4 is rated for. On the road: the driver stays composed at highway-speed output levels without the magnetic saturation that causes distortion in less specified motors.
The tweeter is a 1.0-inch PEI dome loaded by the V8™ Dispersion Guide for 360° tweeter projection — Polyetherimide chosen for thermal stability and UV/moisture resistance in an outdoor mounting position. The independent tweeter input in bi-amp mode allows separate drive and tuning through a DSP. In coaxial mode, the switchable built-in 6dB crossover handles the split automatically. On the road: clean, non-fatiguing high-frequency detail distributed evenly across the listening area from a rear position.
The custom-tooled polycarbonate basket is UV-stabilised and thermally resistant, maintaining alignment under the vibration and heat of saddlebag lid and rear pod positions at speed.
Sensitivity and Frequency Coverage
At 89 dB (1W/1m), the CXX57.4 is a lower-sensitivity driver than the CXX65 and CXX69 formats — a function of the 5×7" cone area. Paired with a quality amplifier producing adequate power at 4Ω, the CXX57.4 has the output to perform as a rear stage at highway speed. For bridged configurations delivering higher per-channel output into the 4Ω load, that power is where the CXX57.4 earns its place.
Frequency response runs 50 Hz – 20 kHz (±3 dB). The 5×7" format gives meaningful mid-bass extension, covering the rear stage's frequency responsibilities from a saddlebag lid or pod position. In bi-amp mode, separate tuning of the woofer and tweeter crossover points through a DSP can optimise this coverage further.
Why 4Ω — Bridged Amps and Conservative Builds
When an amplifier runs in bridged mode, it combines two channels to drive a single speaker pair with more power. The trade-off is that bridging halves the impedance the amplifier sees — a 4Ω speaker on a bridged channel presents a 2Ω load to the amplifier. Most quality amplifiers including the Cicada FLX500.4 and FLX700.4 are stable at 2Ω in bridged mode. Running a 2Ω speaker bridged would present a 1Ω load — below safe operating limits for most amplifiers. The CXX57.4 is the correct CVO Boom! Stage II replacement for any bridged-amp rear stage.
In non-bridged configurations, the 4Ω woofer also gives the amplifier more thermal headroom than the CXX57.2's 2Ω woofer — less current demand, less heat, and more tolerance for the wiring realities of a motorcycle install. For maximum output extraction from a dedicated 2Ω-rated amplifier running in stereo, the CXX57.2 is the correct choice.
Fitment
- Mounting depth: 56.8 mm (2.23 in).
- Mounting diameter (cutout): 123 mm × 185 mm (4.84 in × 7.3 in).
- Direct drop-in replacement for Harley-Davidson CVO Boom! Stage II rear speakers — bi-ampable terminals match OEM Stage II wiring architecture. No adapters or rewiring required.
- Compatible with all Harley-Davidson Touring 5×7" rear saddlebag lid and pod positions: Street Glide (2014–2023), Street Glide CVO (2014–2023), Ultra Limited (2014–2023), Electra Glide (2014–2023), Road Glide (2015–2023), Road Glide CVO (2015–2023), Road Glide Limited (2020–2023), Tri Glide Ultra (2009–2023), Freewheeler (2015+).
- Compatible with bridged-amp configurations and 4Ω amplifiers — Cicada FLX500.4, FLX700.4, Rockford Fosgate, Soundstream, and Diamond Audio.
Technical Specifications
| Driver Size | 5×7 in |
| Design | Bi-ampable coaxial — switchable coaxial/bi-amp mode |
| Impedance — Woofer | 4Ω nominal |
| Impedance — Tweeter | 4Ω nominal |
| Power Handling — RMS | 125W RMS |
| Power Handling — MAX | 250W peak |
| Sensitivity | 89 dB (1W/1m) |
| Frequency Response | 50 Hz – 20 kHz (±3 dB) |
| Voice Coil — Mid-bass | 1.4 in (35 mm) |
| Voice Coil — Tweeter | 1.0 in (25 mm) |
| Magnet Type | Neodymium N45H |
| Cone Material | Kevlar |
| Tweeter Dome | 1.0 in PEI dome |
| Tweeter Dispersion | V8™ Dispersion Guide — 360° tweeter projection |
| Crossover | Switchable built-in 6dB — coaxial or bi-amp mode |
| Mounting Depth | 56.8 mm (2.23 in) |
| Mounting Diameter (Cutout) | 123 mm × 185 mm (4.84 in × 7.3 in) |
| Weather Resistance | Rain or Shine™ — Kevlar cone, PEI tweeter dome, polycarbonate basket |
| Warranty | 2 years |
| Sold As | Pair |
Australia Shipping:
- Under $500 → $19.95
- $500–$2,500 → $14.95
- Over $2,500 → FREE
- Bulky items → +$24.95 surcharge (waived over $2,500)
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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.