Cicada Audio 14FLXPCHCXX-4X4U — Level 3 PRO DSP Amplifier & Horn Coaxial Ultra Kit for 2014–2023 Harley Touring

System Overview

The FLX700.4PRO — DSP Amplifier

The FLX700.4PRO is a 4-channel Class-D amplifier with an integrated DSP processor. At 175W RMS per channel into 2Ω, it drives the CH65.2C front pair at rated output. The DSP processor adds independent control over output level, parametric EQ, and crossover frequency for front and rear channel pairs — the ability to tune the Tour-Pak fill independently of the horn coaxial front stage matters in a system where the two speaker positions have different enclosure volumes and different tonal characters. On the road: the FLX700.4PRO provides the headroom to push the CH65.2C horn coaxials against highway noise without clipping, and the DSP allows the system to be dialled in for the actual riding environment rather than set-and-forget at flat response.

The CH65.2C Horn Coaxial Speakers

The CH65.2C uses a horn-loaded tweeter — the high-frequency driver sits at the throat of a small horn that concentrates and directs the treble output forward toward the rider. Standard dome tweeters radiate in a wide hemisphere; the horn narrows that dispersion and adds efficiency in the process. At 2Ω, the CH65.2C is the correct front-channel load for the FLX700.4PRO. On the road: the difference is in vocal presence and high-frequency intelligibility at speed — where a dome tweeter starts to scatter into the airstream and lose definition, the horn-loaded design continues to project directly into the listening position. At 120km/h, that difference is audible.

The CXX65.4 Tour-Pak Rear Speakers

The CXX65.4 is the 4Ω version of Cicada Audio's CXX Pro Coaxial — carbon matrix cone, high-sensitivity voice coil. In the Tour-Pak lid position, the 4Ω rating works with the FLX700.4PRO's rear channels. The DSP allows the rear level to be trimmed relative to the front stage so Tour-Pak fill adds depth without overpowering the horn coaxials. On the road: the CXX65.4 in the Tour-Pak provides genuine rear fill that passengers and pillion riders can hear, and the DSP-controlled level balance means the system sounds coherent front-to-rear rather than two disconnected stages.

Why 6 AWG Wiring

The HDPG6K 6 AWG power and ground kit is matched to the FLX700.4PRO's current draw. A 700W Class-D amplifier at sustained output draws significantly more current than a 500W design — running 8 AWG introduces resistance that shows up as voltage drop across the amp's power rails and reduces available headroom. The 6 AWG kit eliminates that limitation. On the road: stable voltage rail means consistent output ceiling — the amplifier delivers what the DSP settings ask for, without dynamic compression from an undersized power wire.

Radio Flash — Required Before Installation

The 2014–2023 Harley-Davidson® Infotainment radio ships from the factory with firmware that applies EQ curves, dynamic compression, and output limiting. None of this is removed when you add an amplifier — and with a DSP amplifier, the radio's processing stacks on top of the DSP settings, defeating the purpose of tuning. The flash removes factory processing and lets the FLX700.4PRO's DSP work from a clean signal. TechnoResearch is the most widely used service; any authorised Harley-Davidson® dealer can also perform it.

In the Box

All variants include:

• FLX700.4PRO — 4-channel Class-D DSP amplifier (175W × 4 @ 2Ω RMS)
• CH65.2C — 6.5″ Horn Coaxial speakers, 2Ω (front fairing pair)
• CXX65.4 — 6.5″ Pro Coaxial speakers, 4Ω (Tour-Pak lid pair)
• HDTSLINKv2 — H-D® T-Harness with Maestro AR Compatibility
• HDPG6K — 6 AWG fused power and ground wiring kit

Road Glide variant additionally includes:

• 14HDAR-RG — CX/DSP/FLX Amplifier Mounting System — H-D® Road Glide® (2014–2023)
• CHDRGG — H-D® 2014–2023 Road Glide® Kidney Grille (pair)

Street Glide variant additionally includes:

• 14HDAR-SG — CX/DSP/FLX Amplifier Mounting System — H-D® Street Glide® (2014–2023)
• CHDSGG — H-D® 2014–2023 Street Glide® Round Grille (pair)