Cicada Audio CHX8.4 – 8.0" Pro Coaxial Horn Motorcycle Speakers (4Ω, Carbon Matrix Composite)
$1,535.00 AUD
SKU: CHX8.4
Skip to product information
Cicada Audio CHX8.4 – 8.0" Pro Coaxial Horn Motorcycle Speakers (4Ω, Carbon Matrix Composite)
$1,535.00 AUD
SKU: CHX8.4
| Size | 8 · Horn-Loaded |
| Impedance | 4 Ohm |
| Power | 400W RMS |
| Year Range | 1998-2013, 2014-2023, 2024+ |
| Location | Lower Fairing, Saddlebags |
The CHX8.2 at 4Ω – built for bridged channels and conservative builds.
The Cicada Audio CHX8.4 is an 8-inch 4Ω PRO coaxial horn speaker – 400W RMS, 92 dB sensitivity, aluminium horn tweeter with Nanofram™ all-weather horn cover, repairable CHT175 1.75-inch tweeter voice coil, Carbon Matrix Composite™ (CMC™) mid-bass cone, Black Coat™ OFC 2.5-inch mid-bass voice coil, N35SH neodymium motor, tweeter attenuation (-3/-6 dB), and an external 12 dB crossover in a die-cast aluminium basket with Vortex Flow Venting™. Built for custom enclosure positions on Harley-Davidson® Touring. Sold in pairs.
The CHX8.4 shares every construction element with the CHX8.2 – the same CMC™ cone, the same repairable CHT175 tweeter, the same 400W RMS power handling and 92 dB sensitivity. The 4Ω impedance presents a higher electrical load to the amplifier than the 2Ω version: lower current demand, reduced amplifier thermal stress, and compatibility with bridged amplifier configurations where a 4Ω minimum load is required. The horn output is identical. The infrastructure demands are lighter.
Who This Speaker Is For
For riders building custom 8-inch enclosures who are running bridged amplifier channels, or who want the conservative 4Ω impedance for better thermal performance. The CHX8.4 is the 4Ω variant of the CHX8.2 – same driver, same PRO construction, higher impedance. For dedicated 2Ω-rated amplifiers in stereo, the CHX8.2 extracts maximum power.
What This Is Best For
- Bridged amplifier configurations driving custom 8-inch enclosures – when channels are bridged for maximum per-channel output, the CHX8.4 satisfies the 4Ω minimum load requirement. The FLX1000.4 bridged into CHX8.4 at 4Ω is a supported configuration for high-output rear stage builds.
- Uniform 4Ω PRO horn builds – pairs with CHX69.4 and CHX65.4 for builds where consistent 4Ω impedance across every position simplifies amplifier matching and reduces total system current draw.
- Builds where the amplifier drives multiple high-output positions simultaneously – 4Ω on every driver reduces total current demand. In a multi-speaker build where the amp is working hard across four channels, 4Ω everywhere reduces thermal load throughout.
- Tour-Pak and custom saddlebag lid builds at 4Ω – the same custom enclosure positions as the CHX8.2, with the impedance choice that suits the amplifier configuration.
⚠ Crossover Setting – Read Before Installing
Set your high-pass crossover to 90 Hz minimum at 24 dB/oct slope before powering the CHX8.4. Horn coaxial drivers reach their mechanical travel limit (XMAX) at low frequencies – crossing over too low causes over-excursion. The damage is mechanical: tinsel lead connections tear from the voice coil/spider assembly as the cone overextends. This is not a power problem. It is a crossover problem.
If pairing with a 10-inch pro mid-bass in a bag divider enclosure: the limited air space of the bag divider requires a higher crossover setting. Set the CHX8.4 to 250 Hz at 24 dB/oct on DSP, or 300 Hz at 12 dB/oct on any amplifier. Any lower crossover point will cause distortion and driver damage.
2Ω vs 4Ω – Choosing the Right Version
The CHX8.4 is a 4Ω speaker. Choose the 4Ω version for bridged amplifier configurations, conservative system designs where amplifier thermal margin matters, or when the amplifier already delivers sufficient power at 4Ω. For maximum output from a dedicated 2Ω-rated amplifier in stereo, the CHX8.2 (2Ω) is the correct choice.
What's Inside the CHX8.4
The CHX8.4 is identical in construction to the CHX8.2 – all construction notes below apply equally to both impedance variants.
The tweeter is an aluminium dome in a horn waveguide, protected by the Nanofram™ Horn Cover for all-weather protection. The 1.75-inch (44mm) CHT175 repairable OFC copper tweeter voice coil can be replaced if damaged, extending the driver's service life. Horn loading delivers 92 dB sensitivity. The 4Ω impedance adds thermal headroom to both the driver and the amplifier at the sustained output levels this speaker handles. On the road: PRO horn output from custom positions with the amplifier running cooler across the rear channels.
The mid-bass cone is Carbon Matrix Composite™ (CMC™) – lightweight, rigid, and thermally stable. The 2.5-inch / 64mm Black Coat™ OFC copper mid-bass voice coil handles sustained 400W RMS. The motor is an N35SH neodymium with H-grade temperature rating. The die-cast aluminium basket with Vortex Flow Venting™ manages heat build-up through active airflow. Tweeter attenuation of -3 or -6 dB via the external crossover allows level matching against the mid-bass in the specific acoustic environment the speaker occupies.
The external 12 dB crossover is custom-tooled, vented, and encased, with the tweeter attenuation resistor heat-sink encased separately.
Sensitivity and Frequency Coverage
At 92 dB (1W/1m) and 400W RMS, the CHX8.4 matches the output level of the CHX8.2 – the impedance choice changes amplifier compatibility, not speaker output. Frequency response runs 46 Hz – 20 kHz (±3 dB). The 4Ω impedance means the amplifier draws less current on the rear channels – in a build where all four channels share one amplifier, 4Ω rear speakers give the front channels more thermal headroom.
Why 4Ω – Bridged Amps and Thermal Margin
A 4Ω speaker presents a higher electrical load than a 2Ω speaker – lower current demand, less heat on both sides of the connection, and compatibility with bridged configurations. For builds where channels are bridged for maximum per-channel output, the 4Ω load satisfies the minimum impedance requirement on amplifiers including the FLX1000.4 and FLX1400.4. For stereo installs at the amp's rated 2Ω output, the CHX8.2 is the matching choice.
Fitment
- Designed for custom enclosure positions – not standard factory Harley speaker openings.
- Custom saddlebag lid enclosures: Purpose-built saddlebag lids with appropriate internal volume for 8-inch driver operation.
- Tour-Pak speaker panels: Custom fabricated lid panels sized to the CHX8.4's mounting requirements.
- Lower fairing enclosures: Custom-built lower fairing speaker boxes with sufficient cavity depth.
- Bespoke enclosure builds: Any custom-fabricated enclosure designed around the CHX8.4's mounting diameter and depth.
- Mounting Depth: 84 mm (3.3 in). Mounting Diameter (cutout): 182 mm (7.2 in).
- Wiring: 0.187 connectors – matches stock H-D speaker wiring. Four spare bare 0.187 connectors included as backups.
- Compatible with 4Ω-rated amplifiers including bridged configurations – FLX1000.4, FLX1400.4, and other 4Ω-stable motorcycle amplifiers.
Technical Specifications
| Driver Size | 8 in |
| Impedance | 4Ω nominal |
| Power Handling – RMS | 400W RMS |
| Power Handling – MAX | 800W peak |
| Sensitivity | 92 dB (1W/1m) |
| Frequency Response | 46 Hz – 20 kHz (±3 dB) |
| Minimum Crossover Frequency | 90 Hz @ 24 dB/oct – see crossover warning above |
| Voice Coil – Mid-bass | 2.5 in (64 mm) – Black Coat™ OFC copper |
| Voice Coil – Tweeter | 1.75 in (44 mm) – OFC copper, CHT175 repairable |
| Magnet Type | Neodymium N35SH |
| Cone Material | Carbon Matrix Composite™ (CMC™) |
| Tweeter Dome | Aluminium |
| Tweeter Loading | Horn waveguide – Nanofram™ Horn Cover (Rain or Shine™) |
| Horn Cover | Nanofram™ – removable threaded horn ring |
| Tweeter Attenuation | -3 / -6 dB (heat-sink encased resistor crossover) |
| Crossover | External 12 dB – custom tooled, vented, encased |
| Basket | Die-cast aluminium – Vortex Flow Venting™ |
| Mounting Depth | 84 mm (3.3 in) |
| Mounting Diameter (Cutout) | 182 mm (7.2 in) |
| Weather Resistance | Rain or Shine™ – Nanofram™ Horn Cover, CMC™ cone, aluminium tweeter dome |
| Warranty | 2 years |
| Sold As | Pair |
Australia Shipping:
- Under $500 → $19.95
- $500–$2,500 → $14.95
- $2,500 and above → FREE
- Bulky items → +$25 surcharge (waived once your order reaches $2,500)
Fast dispatch from Brisbane. In-stock orders placed before 1pm AEST usually ship the same business day.
Change of mind: Request a return within 30 days of delivery. The product must be unused, unopened and in its original sealed packaging, valued at $50 or more, and you'll need an RMA number from us before sending anything. Return freight is yours, and a restocking fee of up to 15% may apply – we'll confirm any fee before the return is accepted.
Not returnable for change of mind: opened, installed or test-fitted items, special-order and custom products, custom harnesses, completed tuning, gift cards and items under $50.
Fitment: If we confirmed fitment in writing based on accurate bike details and it doesn't fit, we'll put it right and cover reasonable freight. Not sure? Ask us before you order – we're happy to help.
Faulty, damaged or wrong item: Contact us first with your order number. Faults follow our RMA and warranty process, and none of this affects your rights under the Australian Consumer Law.