SoundQubed HDX Series 6.5" Coaxial 2-way Speakers (pair)
Description
Description
SoundQubed HDX-CX65 — 6.5" 2-Way Coaxial Speakers | Glass Fiber Cone | Neodymium Tweeter | Pair
The SoundQubed HDX-CX65 is a high-performance 6.5" 2-way coaxial speaker built for enthusiasts who want a direct-fit, stock-location upgrade that keeps up with the rest of the HDX lineup. Featuring a glass fiber cone, rubber surround, a 410g barium ferrite magnet, and an integrated neodymium PEI dome tweeter, the HDX-CX65 delivers 80W RMS / 240W max at 89 dB sensitivity with a frequency response of 40 Hz–20 kHz. Designed to fit standard 6.5" factory mounting locations with confidence, it’s the straightforward, high-performance upgrade your front stage deserves. Sold as a pair with grills included.
The HDX-CX65 woofer features a 1" / 25.5mm KSV voice coil former wound with EISV winding material, a glass fiber cone with a rubber surround, and a black matte steel basket. The integrated 1" / 25.4mm neodymium tweeter uses a PEI diaphragm and EISVM winding on a KSV former for smooth, detailed high-frequency reproduction. With a recommended hi-pass crossover at 60 Hz, the HDX-CX65 works seamlessly with your amplifier’s built-in crossover — no separate passive crossover required.
The T/S parameters confirm a well-engineered driver: Fs of 64 Hz, Xmax of 2.7mm, Vas of 10.84L, and a cone area (Sd) of 131cm². Whether you’re building a daily driver system, upgrading a motorcycle bagger, or completing an HDX front stage to match your subwoofer, the HDX-CX65 delivers the output and clarity to get it done.
Why Choose the SoundQubed HDX-CX65?
- 80W RMS / 240W MAX @ 4Ω — Handles real amplifier power for a 6.5" coaxial — pairs well with any SoundQubed 4-channel amplifier.
- 89 dB Sensitivity (1W/1m) — Efficient enough for head unit power, but designed to shine with proper amplification.
- Glass Fiber Cone + Rubber Surround — Stiff, lightweight cone material delivers accurate midrange with controlled resonance and long-term durability.
- 410g Barium Ferrite Magnet — Powerful motor for a 6.5" coaxial — drives the cone with authority for solid midbass output.
- Neodymium Tweeter (PEI Diaphragm) — Smooth, detailed high-frequency reproduction integrated directly into the coaxial design — no separate tweeter install required.
- 40 Hz–20 kHz Frequency Response — Wide range from upper bass through extended treble — a complete front-stage solution in a single driver.
- Direct-Fit 6.5" Footprint — 5.55" / 141mm baffle cutout fits most OEM 6.5" door and dash locations without modification.
- Grills Included — Complete install-ready package for a clean, finished look.
Installation & Pairing Recommendations
Amplifier Pairing: The HDX-CX65 handles 80W RMS / 240W max at 4Ω. It pairs perfectly with any SoundQubed 4-channel amplifier — the S4-100 (100W x4), Q4-150ABv2 (150W x4), or Q4-2000 (325W x4) are all excellent matches. Set your amplifier’s HPF at 60–80 Hz to protect the driver and maximize output.
Motorcycle / Bagger Install: The HDX-CX65 is a popular choice for Harley-Davidson fairing and saddlebag speaker locations that accept 6.5" drivers. Pair with the SoundQubed BG4-700 or BG4-1400 for a complete bagger audio system.
System Integration: The HDX-CX65 is engineered to pair with HDX subwoofers for a coordinated, full-range system within the same lineup. Run the HDX-CX65 on your front channels (HPF at 60–80 Hz) and let a dedicated SoundQubed monoblock handle the low end for a complete, balanced build.
Mounting: The HDX-CX65 requires a 5.55" / 141mm baffle cutout and 2.36" / 60mm mounting depth. Without grill, overall diameter is 6.51" / 165.5mm. With grill: 7.26" / 184.5mm. Verify your door panel depth before purchasing.
Full Specifications
General
| Specification | Value |
|---|---|
| Nominal Diameter | 6.5" / 165mm |
| Nominal Impedance | 4 Ohms |
| RMS Power Handling | 80W |
| MAX Power Handling | 240W |
| Sensitivity (1W/1m) | 89 dB |
| Frequency Response | 40 Hz – 20 kHz |
| Recommended Hi-Pass Crossover | 60 Hz |
| Number of Ways | 2-Way |
| Sold In | Pair |
| Grill Included | Yes |
Woofer Specifications
| Specification | Value |
|---|---|
| Voice Coil Diameter | 1" / 25.5mm |
| Voice Coil Former Material | KSV |
| Winding Material | EISV |
| Cone Material | Glass Fiber |
| Surround Material | Rubber |
| Basket Material | Steel |
| Basket Color/Finish | Black Matte |
| Magnet Material | Barium Ferrite |
| Magnet Weight | 410g |
Thiele & Small Parameters
| Parameter | Value |
|---|---|
| Equivalent Volume (Vas) | 10.84L / 0.382ft³ |
| Excursion One Way (Xmax) | 2.7mm |
| Free Air Resonance (Fs) | 64 Hz |
| Mechanical Factor (Qms) | 9.44 |
| Electrical Factor (Qes) | 0.79 |
| Total Factor (Qts) | 0.73 |
| Mechanical Mass (Mms) | 13.72g |
| Mechanical Compliance (Cms) | 444mm/N |
| BL Factor (BL) | 5.1 |
| Voice Coil Inductance (Le) | 0.228mH |
| Cone Area (Sd) | 131cm² |
| DC Resistance (Re) | 3.5 Ohms |
| Mechanical Mass w/o Air (Mmd) | 12g |
Tweeter Specifications
| Specification | Value |
|---|---|
| Nominal Diameter | 1" / 25.4mm |
| Voice Coil Diameter | 0.8" / 20.4mm |
| VC Former Material | KSV |
| Winding Material | EISVM |
| Diaphragm Material | PEI |
| Magnet Material | Neodymium |
| Magnet Weight | 8.5g |
Speaker Measurements
| Dimension | Value |
|---|---|
| Overall Diameter (With Grill) | 7.26" / 184.5mm |
| Overall Depth (With Grill) | 3" / 76.5mm |
| Overall Diameter (Without Grill) | 6.51" / 165.5mm |
| Overall Depth (Without Grill) | 2.88" / 73.3mm |
| Front Mount Baffle Cutout | 5.55" / 141mm |
| Mounting Depth | 2.36" / 60mm |
| Motor Diameter | 3.70" / 94mm |
Frequently Asked Questions
Q: What amplifier should I pair with the HDX-CX65?
A: The HDX-CX65 handles 80W RMS / 240W max at 4Ω. The SoundQubed S4-100 (100W x4) or Q4-150ABv2 (150W x4) are perfect matches for a daily driver build. For more output, the Q4-2000 (325W x4) will push these speakers to their full potential. Set your HPF at 60–80 Hz.
Q: Do I need a separate tweeter with the HDX-CX65?
A: No — the HDX-CX65 is a 2-way coaxial speaker with an integrated 1" neodymium PEI tweeter built into the woofer. No separate tweeter or passive crossover is required.
Q: Will the HDX-CX65 fit my Harley-Davidson fairing or saddlebag locations?
A: The HDX-CX65 requires a 5.55" / 141mm baffle cutout and 2.36" / 60mm mounting depth. Many Harley-Davidson touring models accept 6.5" speakers in fairing and saddlebag locations — verify your specific model’s cutout and depth before purchasing. Pair with the BG4-700 or BG4-1400 for a complete bagger audio system.
Q: Are these sold as a pair or individually?
A: The HDX-CX65 is sold as a pair — two speakers and two grills are included.
