{"product_id":"soundqubed-hds-series-4-coaxial-2-way-speakers-pair","title":"SoundQubed HDS Series 4\" Coaxial 2-way Speakers (pair)","description":"\u003ch2\u003e\n\u003cstrong\u003eSoundQubed HDS Series 4\" 2-Way Coaxial Speakers\u003c\/strong\u003e — Paper Cone | Mylar Dome Tweeter | Pair\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eSoundQubed HDS Series 4\" 2-Way Coaxial\u003c\/strong\u003e 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 \u003cstrong\u003eHeavy Duty Street Series\u003c\/strong\u003e, and that’s exactly what you get: a speaker that handles more power, looks good, and fits your budget. Featuring a \u003cstrong\u003epaper cone\u003c\/strong\u003e, \u003cstrong\u003erubber surround\u003c\/strong\u003e, a \u003cstrong\u003e153g barium ferrite magnet\u003c\/strong\u003e, and an integrated \u003cstrong\u003e1\" Mylar dome neodymium tweeter\u003c\/strong\u003e, the HDS 4\" delivers \u003cstrong\u003e40W RMS \/ 120W max\u003c\/strong\u003e at \u003cstrong\u003e83 dB sensitivity\u003c\/strong\u003e with a frequency response of \u003cstrong\u003e120 Hz–20 kHz\u003c\/strong\u003e. Sold as a pair with grills included.\u003c\/p\u003e\n\n\u003cp\u003eThe HDS 4\" woofer features a \u003cstrong\u003e1\" \/ 25.5mm ASV voice coil former\u003c\/strong\u003e wound with \u003cstrong\u003eEISV winding material\u003c\/strong\u003e, a \u003cstrong\u003epaper cone\u003c\/strong\u003e with a \u003cstrong\u003erubber surround\u003c\/strong\u003e, and a \u003cstrong\u003eblack matte steel basket\u003c\/strong\u003e. The integrated \u003cstrong\u003e1\" \/ 25.4mm Mylar dome tweeter\u003c\/strong\u003e uses a \u003cstrong\u003eneodymium magnet (3g)\u003c\/strong\u003e and \u003cstrong\u003eEISVM winding\u003c\/strong\u003e on a KSV former for high-frequency reproduction. With a recommended hi-pass crossover at \u003cstrong\u003e150 Hz\u003c\/strong\u003e, the HDS 4\" works seamlessly with your amplifier’s built-in crossover — no separate passive crossover required.\u003c\/p\u003e\n\n\u003cp\u003eThe T\/S parameters confirm a compact, upper-midrange-focused driver: \u003cstrong\u003eFs of 105 Hz\u003c\/strong\u003e, \u003cstrong\u003eXmax of 2.3mm\u003c\/strong\u003e, \u003cstrong\u003eVas of 1.8L\u003c\/strong\u003e, and a \u003cstrong\u003econe area (Sd) of 55cm²\u003c\/strong\u003e. Whether you’re upgrading factory 4\" dash or door locations, the HDS 4\" delivers the output and value to get it done.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Choose the SoundQubed HDS Series 4\" Coaxial?\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e40W RMS \/ 120W MAX @ 4Ω\u003c\/strong\u003e — Handles real amplifier power for an entry-level 4\" coaxial — a meaningful step up from stock speakers.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e83 dB Sensitivity (1W\/1m)\u003c\/strong\u003e — Works with head unit power, but performs best with proper amplification.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePaper Cone + Rubber Surround\u003c\/strong\u003e — Classic cone material with a warm, natural midrange character and long-term durability from the rubber surround.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e153g Barium Ferrite Magnet\u003c\/strong\u003e — Solid motor for an entry-level 4\" — clean, controlled upper midrange output.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e1\" Mylar Dome Neodymium Tweeter\u003c\/strong\u003e — Integrated high-frequency driver for extended treble response — no separate tweeter install required.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e120 Hz–20 kHz Frequency Response\u003c\/strong\u003e — Purpose-built for upper midrange and treble reproduction in compact 4\" locations.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDirect-Fit 4\" Footprint\u003c\/strong\u003e — 3.6\" \/ 92mm baffle cutout fits most OEM 4\" dash and door locations without modification.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGrills Included\u003c\/strong\u003e — Complete install-ready package for a clean, finished look.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation \u0026amp; Pairing Recommendations\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eAmplifier Pairing:\u003c\/strong\u003e The HDS 4\" handles \u003cstrong\u003e40W RMS \/ 120W max at 4Ω\u003c\/strong\u003e. 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.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e The HDS 4\" has an \u003cstrong\u003eFs of 105 Hz\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMounting:\u003c\/strong\u003e The HDS 4\" requires a \u003cstrong\u003e3.6\" \/ 92mm baffle cutout\u003c\/strong\u003e and \u003cstrong\u003e1.7\" \/ 43.5mm mounting depth\u003c\/strong\u003e. 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.\u003c\/p\u003e\n\n\u003ch2\u003eFull Specifications\u003c\/h2\u003e\n\n\u003ch3\u003eGeneral\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth style=\"background-color:#222;color:#fff;padding:8px;text-align:left;\"\u003eSpecification\u003c\/th\u003e\n      \u003cth style=\"background-color:#222;color:#fff;padding:8px;text-align:left;\"\u003eValue\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eNominal Diameter\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e4\" \/ 101mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eNominal Impedance\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e4 Ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eRMS Power Handling\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e40W\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eMAX Power Handling\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e120W\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eSensitivity (1W\/1m)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e83 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eFrequency Response\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e120 Hz – 20 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eRecommended Hi-Pass Crossover\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e150 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eNumber of Ways\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2-Way\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eSold In\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003ePair\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eGrill Included\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eWoofer Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth style=\"background-color:#222;color:#fff;padding:8px;text-align:left;\"\u003eSpecification\u003c\/th\u003e\n      \u003cth style=\"background-color:#222;color:#fff;padding:8px;text-align:left;\"\u003eValue\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eVoice Coil Diameter\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e1\" \/ 25.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eVoice Coil Former Material\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eASV\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eWinding Material\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eEISV\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eCone Material\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003ePaper\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eSurround Material\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eRubber\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eBasket Material\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eSteel\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eBasket Color\/Finish\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eBlack Matte\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eMagnet Material\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eBarium Ferrite\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eMagnet Weight\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e153g\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eThiele \u0026amp; Small Parameters\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth style=\"background-color:#222;color:#fff;padding:8px;text-align:left;\"\u003eParameter\u003c\/th\u003e\n      \u003cth style=\"background-color:#222;color:#fff;padding:8px;text-align:left;\"\u003eValue\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eEquivalent Volume (Vas)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e1.8L \/ 0.063ft³\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eExcursion One Way (Xmax)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2.3mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eFree Air Resonance (Fs)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e105 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eMechanical Factor (Qms)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e4.3\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eElectrical Factor (Qes)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2.2\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eTotal Factor (Qts)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e1.4\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eMechanical Mass (Mms)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e6.4g\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eMechanical Compliance (Cms)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e184mm\/N\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eBL Factor (BL)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e3.2\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eVoice Coil Inductance (Le)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e0.172mH\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eCone Area (Sd)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e55cm²\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eDC Resistance (Re)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e3.7 Ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eMechanical Mass w\/o Air (Mmd)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e8g\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eTweeter Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth style=\"background-color:#222;color:#fff;padding:8px;text-align:left;\"\u003eSpecification\u003c\/th\u003e\n      \u003cth style=\"background-color:#222;color:#fff;padding:8px;text-align:left;\"\u003eValue\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eNominal Diameter\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e1\" \/ 25.4mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eVoice Coil Diameter\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e0.5\" \/ 13mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eVC Former Material\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eKSV\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eWinding Material\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eEISVM\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eDiaphragm Material\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eMylar\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eMagnet Material\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eNeodymium\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eMagnet Weight\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e3g\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eSpeaker Measurements\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth style=\"background-color:#222;color:#fff;padding:8px;text-align:left;\"\u003eDimension\u003c\/th\u003e\n      \u003cth style=\"background-color:#222;color:#fff;padding:8px;text-align:left;\"\u003eValue\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eOverall Diameter (With Grill)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e5.27\" \/ 134mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eOverall Depth (With Grill)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2.79\" \/ 71mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eOverall Diameter (Without Grill)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e4\" \/ 103.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eOverall Depth (Without Grill)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2.26\" \/ 57.6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eFront Mount Baffle Cutout\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e3.6\" \/ 92mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eMounting Depth\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e1.7\" \/ 43.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eMotor Diameter\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2.91\" \/ 74mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What’s the difference between the HDS 4\" and the HDS 4x6\" or 5.25\" coaxials?\u003c\/strong\u003e\u003cbr\u003e\nA: 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.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What amplifier should I pair with the HDS 4\"?\u003c\/strong\u003e\u003cbr\u003e\nA: 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.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Do I need a separate tweeter or crossover?\u003c\/strong\u003e\u003cbr\u003e\nA: No — the HDS 4\" is a \u003cstrong\u003e2-way coaxial\u003c\/strong\u003e with an integrated \u003cstrong\u003e1\" Mylar dome tweeter\u003c\/strong\u003e. No separate tweeter or passive crossover is required — just connect to your amplifier and go.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Are these sold as a pair or individually?\u003c\/strong\u003e\u003cbr\u003e\nA: The HDS 4\" is sold as a \u003cstrong\u003epair\u003c\/strong\u003e — two speakers and two grills are included.\u003c\/p\u003e","brand":"SoundQubed","offers":[{"title":"Default Title","offer_id":49849717620964,"sku":null,"price":49.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0842\/2522\/9028\/files\/e7488565-535f-4a9b-930d-6e67dbd72de3.png?v=1789257208","url":"https:\/\/www.12voltoutlet.com\/products\/soundqubed-hds-series-4-coaxial-2-way-speakers-pair","provider":"12 Volt Outlet","version":"1.0","type":"link"}