SoundQubed HDX Series 5.25" Coaxial 2-way Speakers (pair)
Key features
- Speaker size: 5.25″
- RMS power per speaker: 60 W
- Speaker impedance: 4.0 ohms
- Mounting depth: 2.3 in / 58.5 mm
- Frequency response: 40 Hz–20 kHz
- Sensitivity (1 W / 1 m): 89 dB
SoundQubed HDX Series 5.25" Coaxial 2-way Speakers (pair) is backordered and will ship as soon as it is back in stock.
SoundQubed HDX Series 5.25" Coaxial 2-way Speakers (pair) is backordered and will ship as soon as it is back in stock.
Description
Description
Product Overview
Give your car audio system a compact 5.25-inch speaker upgrade with the SoundQubed HDX Series 5.25" 2-way coaxial speakers. A glass fiber woofer cone and integrated 1-inch neodymium PEI tweeter bring midrange and high-frequency sound together in one speaker.
Use them in dash, door, or rear deck locations as part of an HDX system build. The pair includes two grills for a finished installation.
Key Features & Benefits
- Two-way coaxial design: The integrated tweeter handles high frequencies without requiring a separate tweeter installation.
- Glass fiber cone and rubber surround: This combination is designed for controlled midrange response.
- 60W RMS power handling: The 4-ohm speakers can be paired with an amplifier suited to their rating.
- 40 Hz–20 kHz frequency response: The stated range covers upper bass through treble.
- Pair with grills: Two speakers and two grills are included.
Technical Specifications
| 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 |
Why Choose This Product?
The HDX 5.25-inch coaxial combines a woofer and tweeter in one assembly, making it a practical option when you want both drivers in a single speaker location. Its 89 dB sensitivity and 60W RMS rating give you useful details for matching it to your system’s power.
For amplification, the product is recommended with SoundQubed’s S4-100 (100W x4) or Q4-150ABv2 (150W x4). Its stated recommended hi-pass crossover is 60 Hz; the installation guidance also suggests setting an amplifier HPF at 60–80 Hz.
Installation & Compatibility Notes
The speaker requires a 4.45" / 113mm baffle cutout and 2.3" / 58.5mm mounting depth. Check the available space in your intended location, including clearance for the grill if you plan to use it. The product is described for most OEM 5.25-inch dash, door, and rear deck locations.
The speaker has a nominal impedance of 4 Ohms. Confirm that your amplifier supports the load and set its crossover according to your system requirements.
Frequently Asked Questions
What amplifier rating should I consider?
Each speaker is rated at 60W RMS and 180W maximum at 4 Ohms. The product guidance names the SoundQubed S4-100 (100W x4) and Q4-150ABv2 (150W x4) as pairing options.
Do I need a separate tweeter or passive crossover?
No separate tweeter installation is required. The 2-way coaxial design includes a 1-inch neodymium PEI tweeter, and the product description says no separate passive crossover is required.
What mounting space does it require?
Allow for a 4.45" / 113mm baffle cutout and 2.3" / 58.5mm mounting depth. Overall diameter is 5.08" / 129mm without the grill and 6.5" / 165mm with it.
What comes in the package?
The speakers are sold as a pair, with two grills included.
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