{"product_id":"cicada-audio-flx700-4-4-channel-motorcycle-amplifier","title":"Cicada Audio FLX700.4 — Full-Range 4-Channel Class-D Motorcycle Amplifier (700W RMS \/ 175W x4 @ 2Ω)","description":"\u003ch2\u003eFactory Harley audio runs out of headroom before you leave the suburbs.\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe Cicada Audio FLX700.4 is a full-range 4-channel Class-D amplifier purpose-built for motorcycle audio — compact enough to fit standard Harley-Davidson Touring fairing amp trays, capable of delivering 175W × 4 RMS at 2Ω, and carrying the full 20 Hz – 20 kHz crossover range with 48 dB per octave slope control for any speaker stage configuration. The most versatile amplifier in the FLX range.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eMost factory Harley audio systems are engineered to a price point, not a performance target. They clip at highway speeds, roll off in the midrange where clarity matters most, and have no meaningful headroom for demanding speakers. At 100 km\/h with wind and pipes, that gap becomes obvious immediately. A conventional car amplifier is not the answer — wrong chassis size, not weather-rated, and the current draw stresses a motorcycle's charging system. The FLX700.4 solves all three problems.\u003c\/p\u003e\n\n\u003ch3\u003eWho This Is For\u003c\/h3\u003e\n\n\u003cp\u003eFor riders who want a properly powered Harley audio system — not the minimum improvement, but the correct amplifier that drives quality speakers at highway speed without clipping. The FLX700.4 is the step up from the \u003ca href=\"\/products\/cicada-audio-flx500-4-4-channel-class-d-motorcycle-amplifier\"\u003eFLX500.4\u003c\/a\u003e (same crossover, 40% more output per channel) and the crossover-architecture choice when driving multi-way component speaker stages. For builds that need substantially more per-channel output, the \u003ca href=\"\/products\/cicada-audio-flx1000-4-4-channel-motorcycle-amplifier\"\u003eFLX1000.4\u003c\/a\u003e is the next step at the same compact footprint.\u003c\/p\u003e\n\n\u003ch3\u003eWhat This Is Best For\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUpgrading a factory Harley Boom! Box system without replacing the head unit\u003c\/strong\u003e — high-level inputs connect directly, VOX\/DC offset turn-on handles remote wire issues on OEM platforms. No signal processor required to integrate.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRunning a 4-speaker front and rear fairing stage on a Street Glide or Road Glide\u003c\/strong\u003e where amp space is tight — 175W × 4 at 2Ω from a chassis that fits standard Harley fairing amp trays.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-way component builds requiring full crossover control\u003c\/strong\u003e — the 20 Hz – 20 kHz crossover range with 48 dB per octave slopes provides clean driver separation between dedicated horn tweeters and midrange drivers, keeping the front stage coherent at highway speed.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBridged rear channels for a compact subwoofer or mid-bass enclosure\u003c\/strong\u003e — 350W × 2 at 4Ω bridged provides genuine headroom for a sealed mid-bass driver in a saddlebag or Tour-Pak position.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBuilds where charging system load matters\u003c\/strong\u003e — at 50A music-level draw, the FLX700.4 stays within factory Harley alternator capacity on most Touring models. No alternator upgrade required.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntermediate builds that will add DSP later\u003c\/strong\u003e — the FLX700.4 can be retained in the signal chain when a processor is added upstream. Buy the amplifier now, add the DSP when the build progresses.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Bottom Line\u003c\/h3\u003e\n\n\u003cp\u003eThe most versatile amplifier in the FLX range — 175W × 4 RMS at 2Ω, the widest crossover control, and a chassis that fits any standard Harley Touring amp tray. If the build needs real amplifier power without a high-output electrical upgrade, this is the correct starting point.\u003c\/p\u003e\n\n\u003cp\u003eReady to upgrade? Add to cart above. For more per-channel output, the \u003ca href=\"\/products\/cicada-audio-flx1000-4-4-channel-motorcycle-amplifier\"\u003eFLX1000.4 delivers 254W × 4 at 2Ω\u003c\/a\u003e in the next chassis size up. For a more modest build, the \u003ca href=\"\/products\/cicada-audio-flx500-4-4-channel-class-d-motorcycle-amplifier\"\u003eFLX500.4 offers 125W × 4\u003c\/a\u003e at the same footprint.\u003c\/p\u003e\n\n\u003chr class=\"maa-tab-split\"\u003e\n\n\u003ch3\u003ePower Output — What the Numbers Mean\u003c\/h3\u003e\n\n\u003cp\u003eThe FLX700.4 delivers 120W × 4 RMS at 4Ω and 175W × 4 RMS at 2Ω — 700W total RMS at rated voltage (14.4V DC). That is the figure that matters for motorcycle builds where 2Ω pro-audio speakers are standard. The 2Ω figure represents real usable power, not inflated peak numbers.\u003c\/p\u003e\n\n\u003cp\u003eBridged, the amp produces 350W × 2 at 4Ω — the configuration for a two-speaker front stage that needs high output per channel, or for driving a compact subwoofer from the rear channels with authority.\u003c\/p\u003e\n\n\u003cp\u003eAt 80% Class-D efficiency, the FLX700.4 generates significantly less heat than a Class-AB amplifier at equivalent output. On a motorcycle with limited airflow and a charging system running near capacity, this matters for both thermal stability on long rides and for keeping electrical load manageable.\u003c\/p\u003e\n\n\u003ch3\u003eCrossover and Signal Control\u003c\/h3\u003e\n\n\u003cp\u003eThe FLX700.4's crossover spans the full audio range — 20 Hz to 20 kHz — with four selectable slopes: 6, 12, 24, and 48 dB per octave. HPF, LPF, or Full Range mode selection. This is a significantly wider range and steeper slope capability than is common in motorcycle amplifiers, and the 48 dB\/octave option is what makes the difference when running dedicated drivers.\u003c\/p\u003e\n\n\u003cp\u003eAt 48 dB\/octave, you get clean separation between a midrange driver and a horn tweeter without bleed — the kind of control that keeps a front stage coherent at highway speeds. At 6 dB\/octave, the gentle slope suits full-range or wideband coaxial applications.\u003c\/p\u003e\n\n\u003cp\u003eFor builds that need 254W per channel rather than 175W but do not require the steeper crossover slopes of the FLX700.4 — such as high-output coaxial builds — the \u003ca href=\"\/products\/cicada-audio-flx1000-4-4-channel-motorcycle-amplifier\"\u003eFLX1000.4\u003c\/a\u003e offers more power with a 12 dB\/octave crossover at 30 Hz – 300 Hz. The FLX700.4 is the correct choice when multi-way driver separation is part of the system design.\u003c\/p\u003e\n\n\u003cp\u003eInput sensitivity runs 0.2V – 12V, covering both OEM Harley signal levels and standard RCA output from aftermarket head units without requiring a line driver.\u003c\/p\u003e\n\n\u003ch3\u003eSystem Integration\u003c\/h3\u003e\n\n\u003cp\u003eThe FLX700.4 sits between the source unit and the speakers in the signal path. It 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.\u003c\/p\u003e\n\n\u003cp\u003eTurn-on supports three modes: REM (remote trigger), DC offset detection, and VOX (audio signal sensing). VOX and DC offset are particularly useful for OEM integration on older Harley platforms where running a clean remote wire to the head unit is not straightforward.\u003c\/p\u003e\n\n\u003cp\u003eAt 50A music-level current draw, the FLX700.4 sits within the operating range of most factory Harley charging systems — no alternator upgrade required for most builds. Maximum draw is 80A; a 50A fuse is recommended on the power feed.\u003c\/p\u003e\n\n\u003cp\u003eThe FLX700.4 does not include onboard DSP. For builds requiring time alignment, multi-band EQ, or advanced signal routing — particularly on a Street Glide or Road Glide front stage running dedicated drivers — pair with a dedicated DSP processor upstream of the amp inputs.\u003c\/p\u003e\n\n\u003ch3\u003e2024+ Platform Notes\u003c\/h3\u003e\n\n\u003cp\u003eFor 2023.5 CVO and 2024+ Harley-Davidson Touring models running Skyline OS, the FLX700.4 can be integrated as part of an aftermarket audio system when paired with a NAV-TV ZEN-H or ZEN-H Pro. The ZEN-H \/ ZEN-H Pro handles the Skyline OS signal interface — the FLX700.4 then receives the processed output and powers the speakers downstream from it. Without a NAV-TV 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.\u003c\/p\u003e\n\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHarley-Davidson Street Glide:\u003c\/strong\u003e Batwing fairing — fits standard fairing amp tray.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHarley-Davidson Road Glide:\u003c\/strong\u003e Shark nose fairing — fits standard amp tray positions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHarley-Davidson Ultra Limited \/ Ultra Classic:\u003c\/strong\u003e Fits fairing amp rack positions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHarley-Davidson CVO models:\u003c\/strong\u003e Fits fairing amp rack (see 2024+ note above for Skyline OS bikes).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHarley-Davidson Trike:\u003c\/strong\u003e Compatible — fits fairing, trunk, or saddlebag amp rack positions.\u003c\/li\u003e\n  \u003cli\u003eCompatible with OEM Boom! Box radios (high-level input) and all aftermarket head units (high-level or RCA inputs).\u003c\/li\u003e\n  \u003cli\u003eRun 2Ω speakers for maximum rated output; 4Ω for bridged applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\n\u003ctable\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eChannels\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e4-Channel\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eAmplifier Class\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003eClass D\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003ePower Output — 4Ω Stereo @ 14.4V\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e120W × 4 RMS\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003ePower Output — 2Ω Stereo @ 14.4V\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e175W × 4 RMS\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003ePower Output — 4Ω Bridged @ 14.4V\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e350W × 2 RMS\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eTotal RMS Power\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e700W\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eEfficiency\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e80%\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eSignal-to-Noise Ratio\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e91 dB (A-weighted, 20 Hz – 20 kHz)\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eTHD + N\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e0.1% @ 2Ω per channel (10% rated power)\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eDamping Factor\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e200\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eFrequency Response\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e20 Hz – 20 kHz (±3 dB)\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eCrossover Modes\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003eLPF \/ Full Range \/ HPF (selectable)\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eCrossover Range\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e20 Hz – 20 kHz\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eCrossover Slopes\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e6 \/ 12 \/ 24 \/ 48 dB per octave\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eInput Sensitivity\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e0.2V – 12V\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eInputs\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003eHigh-level or Low-level RCA\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eTurn-On Modes\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003eREM \/ DC Offset \/ VOX\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eOperating Voltage\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e9V – 16V\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eCurrent Draw (Music)\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e50A\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eCurrent Draw (Maximum)\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e80A\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eRecommended Fuse\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e50A\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eWeather Resistance\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003eOutdoor-rated — moisture and vibration resistant\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eDimensions — Chassis Only\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e104 × 125 × 51 mm (4.1 × 4.9 × 2.0 in)\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd\u003e\u003cstrong\u003eDimensions — With Mounting Brackets\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd\u003e134 × 125 × 51 mm (5.3 × 4.9 × 2.0 in)\u003c\/td\u003e\n  \u003c\/tr\u003e\n\u003c\/table\u003e","brand":"Cicada Audio","offers":[{"title":"Default Title","offer_id":50338049229047,"sku":"FLX700.4","price":855.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0901\/6505\/1639\/files\/Cicada-Audio-FLX700_4-Full-Range-4-Channel-Class-D-Motorcycle-Amplifier-700W-RMS-175W-x4-2O.jpg?v=1779070174","url":"https:\/\/www.motorcycleaudio.com.au\/products\/cicada-audio-flx700-4-4-channel-motorcycle-amplifier","provider":"Motorcycle Audio Australia","version":"1.0","type":"link"}