SoundQubed HDS Series 4" Coaxial 2-way Speakers (pair)
Description
Description
SoundQubed HDS Series 4" 2-Way Coaxial Speakers — Paper Cone | Mylar Dome Tweeter | Pair
The SoundQubed HDS Series 4" 2-Way Coaxial is SoundQubed’s entry-level 4" coaxial speaker — built for enthusiasts who want a meaningful upgrade over stock dash and door speakers in compact locations without breaking the bank. The HDS Series stands for Heavy Duty Street Series, and that’s exactly what you get: a speaker that handles more power, looks good, and fits your budget. Featuring a paper cone, rubber surround, a 153g barium ferrite magnet, and an integrated 1" Mylar dome neodymium tweeter, the HDS 4" delivers 40W RMS / 120W max at 83 dB sensitivity with a frequency response of 120 Hz–20 kHz. Sold as a pair with grills included.
The HDS 4" woofer features a 1" / 25.5mm ASV voice coil former wound with EISV winding material, a paper cone with a rubber surround, and a black matte steel basket. The integrated 1" / 25.4mm Mylar dome tweeter uses a neodymium magnet (3g) and EISVM winding on a KSV former for high-frequency reproduction. With a recommended hi-pass crossover at 150 Hz, the HDS 4" works seamlessly with your amplifier’s built-in crossover — no separate passive crossover required.
The T/S parameters confirm a compact, upper-midrange-focused driver: Fs of 105 Hz, Xmax of 2.3mm, Vas of 1.8L, and a cone area (Sd) of 55cm². Whether you’re upgrading factory 4" dash or door locations, the HDS 4" delivers the output and value to get it done.
Why Choose the SoundQubed HDS Series 4" Coaxial?
- 40W RMS / 120W MAX @ 4Ω — Handles real amplifier power for an entry-level 4" coaxial — a meaningful step up from stock speakers.
- 83 dB Sensitivity (1W/1m) — Works with head unit power, but performs best with proper amplification.
- Paper Cone + Rubber Surround — Classic cone material with a warm, natural midrange character and long-term durability from the rubber surround.
- 153g Barium Ferrite Magnet — Solid motor for an entry-level 4" — clean, controlled upper midrange output.
- 1" Mylar Dome Neodymium Tweeter — Integrated high-frequency driver for extended treble response — no separate tweeter install required.
- 120 Hz–20 kHz Frequency Response — Purpose-built for upper midrange and treble reproduction in compact 4" locations.
- Direct-Fit 4" Footprint — 3.6" / 92mm baffle cutout fits most OEM 4" dash and door locations without modification.
- Grills Included — Complete install-ready package for a clean, finished look.
Installation & Pairing Recommendations
Amplifier Pairing: The HDS 4" handles 40W RMS / 120W max at 4Ω. It pairs well with any SoundQubed 4-channel amplifier — the S4-100 (100W x4) is an ideal match for a budget-friendly daily driver build. Set your amplifier’s HPF at 150 Hz to protect the driver and maximize output.
Note: The HDS 4" has an Fs of 105 Hz and a recommended HPF of 150 Hz — this is a compact speaker optimized for upper midrange and treble reproduction. It is not designed for extended bass output. Always use a high-pass crossover to protect the driver.
Mounting: The HDS 4" requires a 3.6" / 92mm baffle cutout and 1.7" / 43.5mm mounting depth. Without grill: 4" / 103.5mm diameter, 2.26" / 57.6mm depth. With grill: 5.27" / 134mm diameter, 2.79" / 71mm depth. Verify your mounting location depth before purchasing.
Full Specifications
General
| Specification | Value |
|---|---|
| Nominal Diameter | 4" / 101mm |
| Nominal Impedance | 4 Ohms |
| RMS Power Handling | 40W |
| MAX Power Handling | 120W |
| Sensitivity (1W/1m) | 83 dB |
| Frequency Response | 120 Hz – 20 kHz |
| Recommended Hi-Pass Crossover | 150 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 | ASV |
| Winding Material | EISV |
| Cone Material | Paper |
| Surround Material | Rubber |
| Basket Material | Steel |
| Basket Color/Finish | Black Matte |
| Magnet Material | Barium Ferrite |
| Magnet Weight | 153g |
Thiele & Small Parameters
| Parameter | Value |
|---|---|
| Equivalent Volume (Vas) | 1.8L / 0.063ft³ |
| Excursion One Way (Xmax) | 2.3mm |
| Free Air Resonance (Fs) | 105 Hz |
| Mechanical Factor (Qms) | 4.3 |
| Electrical Factor (Qes) | 2.2 |
| Total Factor (Qts) | 1.4 |
| Mechanical Mass (Mms) | 6.4g |
| Mechanical Compliance (Cms) | 184mm/N |
| BL Factor (BL) | 3.2 |
| Voice Coil Inductance (Le) | 0.172mH |
| Cone Area (Sd) | 55cm² |
| DC Resistance (Re) | 3.7 Ohms |
| Mechanical Mass w/o Air (Mmd) | 8g |
Tweeter Specifications
| Specification | Value |
|---|---|
| Nominal Diameter | 1" / 25.4mm |
| Voice Coil Diameter | 0.5" / 13mm |
| VC Former Material | KSV |
| Winding Material | EISVM |
| Diaphragm Material | Mylar |
| Magnet Material | Neodymium |
| Magnet Weight | 3g |
Speaker Measurements
| Dimension | Value |
|---|---|
| Overall Diameter (With Grill) | 5.27" / 134mm |
| Overall Depth (With Grill) | 2.79" / 71mm |
| Overall Diameter (Without Grill) | 4" / 103.5mm |
| Overall Depth (Without Grill) | 2.26" / 57.6mm |
| Front Mount Baffle Cutout | 3.6" / 92mm |
| Mounting Depth | 1.7" / 43.5mm |
| Motor Diameter | 2.91" / 74mm |
Frequently Asked Questions
Q: What’s the difference between the HDS 4" and the HDS 4x6" or 5.25" coaxials?
A: The HDS 4" is the most compact option in the HDS coaxial lineup — designed for factory 4" round locations. It has the highest Fs (105 Hz) and HPF recommendation (150 Hz) in the lineup, making it best suited for upper midrange and treble reproduction. If your vehicle has 4x6", 5.25", or larger locations, those drivers will deliver more midbass output.
Q: What amplifier should I pair with the HDS 4"?
A: The HDS 4" handles 40W RMS / 120W max at 4Ω. The SoundQubed S4-100 (100W x4) is a perfect match for a daily driver build. Set your HPF at 150 Hz for best results and driver protection.
Q: Do I need a separate tweeter or crossover?
A: No — the HDS 4" is a 2-way coaxial with an integrated 1" Mylar dome tweeter. No separate tweeter or passive crossover is required — just connect to your amplifier and go.
Q: Are these sold as a pair or individually?
A: The HDS 4" is sold as a pair — two speakers and two grills are included.
