Cicada Audio CXX57.2 — 5×7" 2Ω Boom! II Bi-Amp Coaxial Harley Saddlebag Speakers (Pair)

What's Inside the CXX57.2

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 CXX57.2 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 — 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 from a rear position that rarely receives a direct listening axis.

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 CXX57.2 is a lower-sensitivity driver than the CXX65 and CXX69 formats — a function of the 5×7" cone area. The 2Ω woofer impedance compensates by extracting more power from the amplifier at a given voltage, delivering higher actual output than a 4Ω driver of the same sensitivity. Paired with a quality 2Ω-stable amplifier, the CXX57.2 has the output to perform as a rear stage at highway speed.

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 2Ω — CVO Stage II Architecture and Power

The Harley-Davidson Boom! Stage II architecture powers the woofer and tweeter separately — the woofer channel typically runs from a dedicated amplifier output, and the 2Ω impedance is the correct match for extracting the rated power from that channel. An amplifier producing 100W RMS × 4 at 4Ω might produce 175W RMS × 4 at 2Ω from the same hardware — at 89 dB sensitivity, that additional power is where the CXX57.2 gets its rear-stage volume from.

For non-CVO builds in coaxial mode, the same logic applies to the single amplifier channel driving the speaker. For bridged-amp configurations where a 4Ω minimum load is required, the CXX57.4 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+).
• Requires a dedicated external amplifier rated for 2Ω woofer operation — Cicada FLX500.4, FLX700.4, Rockford Fosgate, Soundstream, and Diamond Audio.

Technical Specifications