Cicada Audio CX65.4 – 6.5" 4Ω Coaxial Harley Fairing Speakers (Pair)

What's Inside the CX65.4

The cone is IMPP (Injected Moulded Polypropylene) – moisture-resistant, dimensionally stable across a wide temperature range, and stiff enough to maintain linear excursion at higher output levels. The NBR (Nitrile Butadiene Rubber) surround holds its compliance through cold morning starts and sustained summer heat – unlike foam surrounds, which degrade in outdoor conditions. On the road: the speaker handles a closed fairing in Australian summer heat or a cold morning start without the compliance changes that degrade performance over time.

The 1.4-inch Black Coat™ voice coil carries Cicada's proprietary high-temperature treatment on the former and windings. In an enclosed fairing under sustained load, voice coil temperature is one of the primary failure points for speakers not built for motorcycle audio. The Shortening Ring motor design reduces inductance at high frequencies, keeping distortion low at the top of the mid-bass range and improving the handoff to the tweeter. On the road: cleaner output at volume – the driver handles the upper midrange without the breakdown in control that precedes tweeter overload.

The tweeter is a 1.0-inch PEI dome – chosen for thermal stability and resistance to UV and moisture – loaded by Cicada's DPSH (Dual-Phase Slot Horn). The DPSH horn geometry shapes tweeter dispersion for wide coverage. At highway speed, the rider's head position relative to the fairing changes constantly – the DPSH maintains usable high-frequency energy across a wide listening window rather than a narrow beam that disappears off-axis. On the road: consistent treble coverage whether you're sitting upright at lights or leaning through a corner at speed.

The built-in 6dB crossover protects the tweeter from low-frequency energy without requiring an external crossover unit. The Heavy Duty Injected High Temp Polymer frame and N35 Neodymium motor keep the assembly light and rigid across the operating temperature range.

Sensitivity and Frequency Coverage

At 94 dB (1W/1m), the CX65.4 is meaningfully more efficient than most coaxials in this size class. In a motorcycle system where amplifier output is constrained by the charging system, sensitivity is one of the most valuable specifications a speaker can carry – every additional dB of efficiency is headroom you don't need to generate with more amplifier power.

Frequency response runs 54 Hz – 20 kHz (±5 dB), covering full-range coaxial coverage suited to the fairing position. The 54 Hz lower limit gives genuine bass extension for a 6.5-inch driver. For builds also running a rear stage, the CX65.4 pairs cleanly as the front stage, with the CX69.4 covering the lower frequencies from the saddlebags.

Why 4Ω – Bridged Amps and Thermal Margin

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 each amplifier channel effectively works into half the speaker's impedance – a 4Ω speaker across a bridged channel pair means each channel sees 2Ω. Amplifiers including the Cicada FLX500.4 and FLX700.4 are rated for a minimum 4Ω speaker load when bridged. Running a 2Ω speaker bridged would put each channel at about 1Ω – below safe operating limits for most amplifiers. The CX65.4 is the correct fairing speaker for any bridged-amp setup.

At 4Ω in a standard stereo configuration, the CX65.4 also gives the amplifier more thermal headroom – less current demand, less heat, more margin for sustained operation. For long-distance touring in summer heat, 4Ω is the more conservative choice. For maximum output from a 2Ω-stable amplifier running stereo, the CX65.2 is the higher-output option.

Fitment

• Mounting depth: 57.4 mm (2.26 in) – low-profile design suited to tight fairing cavities.
• Mounting diameter (cutout): 135.1 mm (5.32 in).
• Overall diameter: 165 mm (6.5 in).
• Position: inner fairing on 2014–2023 batwing Touring (Street Glide, Electra Glide, Ultra Limited), 2015–2023 Road Glide, and CVO™ variants, plus Tri Glide models sharing the batwing fairing; also speaker-ready or accessory lower fairings and Tour-Pak pods, which take a 6.5 inch driver.
• This is the upgrade size, not a factory-size claim. 6.5 inch is the purpose-built driver size these positions accept – it is not necessarily the size Harley fitted. The factory fairing driver was 5.25 inch on most standard models and 6.5 inch on some CVO™ and higher-specification factory audio packages, and the factory Tour-Pak driver was 5.25 inch in this era. The lower fairing is not a factory speaker position on standard models – speaker-ready or accessory lowers take a 6.5 inch driver. Confirm the mounting hardware and grille for your exact model and year before ordering.
• 6.5-inch grills and mounting hardware included.
• Compatible with 4Ω Harley audio systems and amplifiers – including the Harley OEM Boom! Box GTS, bridged configurations, Cicada FLX500.4, FLX700.4, Rockford Fosgate, Soundstream, and Diamond Audio.

Technical Specifications