SoundQubed HDX Series 5.25" Coaxial 2-way Speakers (pair)
Description
Description
SoundQubed HDX Series 5.25" 2-Way Coaxial Speakers — Glass Fiber Cone | Neodymium Tweeter | Pair
The SoundQubed HDX Series 5.25" 2-Way Coaxial is a high-performance compact 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 310g barium ferrite magnet, and an integrated neodymium PEI dome tweeter, the HDX 5.25" delivers 60W RMS / 180W max at 89 dB sensitivity with a frequency response of 40 Hz–20 kHz. Designed to fit standard 5.25" factory mounting locations with confidence, it’s the clean, high-performance upgrade your front stage deserves. Sold as a pair with grills included.
The 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 5.25" works seamlessly with your amplifier’s built-in crossover — no separate passive crossover required.
The T/S parameters confirm a well-engineered compact driver: Fs of 77 Hz, Xmax of 2.3mm, Vas of 4.86L, and a cone area (Sd) of 86.5cm². Whether you’re filling dash locations, door panels, or rear deck positions, the HDX 5.25" delivers the output and clarity to complete your HDX system build.
Why Choose the SoundQubed HDX Series 5.25" Coaxial?
- 60W RMS / 180W MAX @ 4Ω — Handles real amplifier power for a 5.25" 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.
- 310g Barium Ferrite Magnet — Solid motor for a 5.25" coaxial — drives the cone with authority for clean, punchy midrange 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 solution in a compact 5.25" footprint.
- Direct-Fit 5.25" Footprint — 4.45" / 113mm baffle cutout fits most OEM 5.25" dash, door, and rear deck locations without modification.
- Grills Included — Complete install-ready package for a clean, finished look.
Installation & Pairing Recommendations
Amplifier Pairing: The HDX 5.25" handles 60W RMS / 180W max at 4Ω. It pairs perfectly with any SoundQubed 4-channel amplifier — the S4-100 (100W x4) or Q4-150ABv2 (150W x4) are ideal matches. Set your amplifier’s HPF at 60–80 Hz to protect the driver and maximize output.
System Integration: The HDX 5.25" is engineered to pair with HDX subwoofers for a coordinated, full-range system within the same lineup. Use them in dash or door locations (HPF at 60–80 Hz) alongside a dedicated SoundQubed monoblock for a complete, balanced build.
Mounting: The HDX 5.25" requires a 4.45" / 113mm baffle cutout and 2.3" / 58.5mm mounting depth. Without grill, overall diameter is 5.08" / 129mm. With grill: 6.5" / 165mm. Verify your mounting location depth before purchasing
Full Specifications
General
| Specification | Value |
|---|---|
| Nominal Diameter | 5.25" / 133mm |
| Nominal Impedance | 4 Ohms |
| RMS Power Handling | 60W |
| MAX Power Handling | 180W |
| 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 | 310g |
Thiele & Small Parameters
| Parameter | Value |
|---|---|
| Equivalent Volume (Vas) | 4.86L / 0.17ft³ |
| Excursion One Way (Xmax) | 2.3mm |
| Free Air Resonance (Fs) | 77 Hz |
| Mechanical Factor (Qms) | 8.39 |
| Electrical Factor (Qes) | 0.87 |
| Total Factor (Qts) | 0.79 |
| Mechanical Mass (Mms) | 9.93g |
| Mechanical Compliance (Cms) | 457mm/N |
| BL Factor (BL) | 4.321 |
| Voice Coil Inductance (Le) | 0.216mH |
| Cone Area (Sd) | 86.5cm² |
| DC Resistance (Re) | 3.5 Ohms |
| Mechanical Mass w/o Air (Mmd) | 9g |
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) | 6.5" / 165mm |
| Overall Depth (With Grill) | 2.97" / 75.5mm |
| Overall Diameter (Without Grill) | 5.08" / 129mm |
| Overall Depth (Without Grill) | 2.77" / 70.5mm |
| Front Mount Baffle Cutout | 4.45" / 113mm |
| Mounting Depth | 2.3" / 58.5mm |
| Motor Diameter | 3.34" / 85mm |
Frequently Asked Questions
Q: What amplifier should I pair with the HDX 5.25" coaxial?
A: The HDX 5.25" handles 60W RMS / 180W max at 4Ω. The SoundQubed S4-100 (100W x4) or Q4-150ABv2 (150W x4) are perfect matches. Set your HPF at 60–80 Hz for best results and driver protection.
Q: Do I need a separate tweeter with the HDX 5.25"?
A: No — the HDX 5.25" 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 5.25" fit my factory locations?
A: The HDX 5.25" requires a 4.45" / 113mm baffle cutout and 2.3" / 58.5mm mounting depth. It fits most OEM 5.25" dash, door, and rear deck locations. Always verify your mounting location depth before purchasing.
Q: Are these sold as a pair or individually?
A: The HDX 5.25" coaxial is sold as a pair — two speakers and two grills are included.
