{"product_id":"cambridge-audio-msx-sub-300-subwoofer","title":"Cambridge Audio MSX Sub 300 Subwoofer","description":"\u003cp\u003eThe Cambridge Audio MSX Sub 300 is a compact active subwoofer that pairs an 8-inch driver and matching passive radiator with a 300-watt amplifier, reaching down to 31Hz for larger rooms and bigger soundtracks. It is the more powerful of the two MSX subwoofers, with DSP that keeps deep bass controlled rather than boomy as the level climbs.\u003c\/p\u003e\u003ch5\u003eKey Features of the MSX Sub 300\u003c\/h5\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDedicated 300W Amplifier:\u003c\/strong\u003e More power for larger rooms and higher output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8-Inch Active Driver with Passive Radiator:\u003c\/strong\u003e A larger driver and matching passive radiator move more air for deeper, fuller bass.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReaches 31Hz:\u003c\/strong\u003e Extension into the bottom octave for cinematic low frequencies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOnboard DSP:\u003c\/strong\u003e Keeps the deepest notes controlled as the volume rises.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVariable Crossover:\u003c\/strong\u003e Adjustable from 50 to 200Hz to match the roll-off of your main speakers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVariable Phase:\u003c\/strong\u003e 0 to 180 degree control time-aligns the sub with your speakers for tighter bass.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuto-On:\u003c\/strong\u003e Powers up with signal, sleeps when idle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt for Larger Spaces:\u003c\/strong\u003e The sub to choose when the room is too big for the Sub 200.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRCA Input and Pass-Through:\u003c\/strong\u003e Connects to any subwoofer or preamp output and forwards the signal on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo Matte Finishes:\u003c\/strong\u003e Matte black or matte white to match the MSX speakers.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch5\u003e300 Watts for Larger Rooms\u003c\/h5\u003e\u003cp\u003eThe Sub 300 steps up from the Sub 200 with a bigger amplifier and a larger driver, the combination Cambridge Audio recommends when a room is too large for the compact sub to fill comfortably. The extra 100 watts and the move to an 8-inch driver give it more headroom and deeper reach, so it can pressurize a bigger space without straining. The tuning philosophy carries over unchanged: scale and authority, but always under control rather than loose and overbearing.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0555\/5073\/8528\/files\/cambridge-audio-msx-sub-300-angled-inline.jpg\" alt=\"Cambridge Audio MSX Sub 300 subwoofer at an angle, Black\" style=\"width:100%;max-width:1000px;height:auto;border-radius:12px;margin:16px 0;\"\u003e\u003c\/p\u003e\u003ch5\u003e8-Inch Driver and Passive Radiator\u003c\/h5\u003e\u003cp\u003eAn 8-inch active driver works with a matching 8-inch passive radiator to move significantly more air than the Sub 200's 6.5-inch array. The passive radiator is an undriven cone energized by the active driver through the cabinet, reinforcing the deepest notes without a port and the noise a port can make at high output. That is how the Sub 300 reaches 31Hz cleanly and stays composed when a soundtrack calls for real low-frequency weight, rather than collapsing into a boom.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0555\/5073\/8528\/files\/cambridge-audio-msx-sub-300-driver-inline.jpg\" alt=\"Cambridge Audio MSX Sub 300 driver and grille detail, Black\" style=\"width:100%;max-width:1000px;height:auto;border-radius:12px;margin:16px 0;\"\u003e\u003c\/p\u003e\u003ch5\u003eDSP Keeps the Bottom Octave in Control\u003c\/h5\u003e\u003cp\u003eDigital signal processing manages the driver so the deepest bass stays defined as you push the level. By shaping output and frequency response on the fly, the DSP lets the Sub 300 chase low-end impact without losing grip, which is what separates a sub that adds atmosphere from one that just muddies the room. It is the same approach as the Sub 200, scaled up to match the bigger driver and amplifier.\u003c\/p\u003e\u003ch5\u003eBlending the Sub 300 With Your Speakers\u003c\/h5\u003e\u003cp\u003eThe Sub 300 gives you the same integration controls as its smaller sibling, which matter even more as output goes up. The variable crossover, from 50 to 200Hz, sets where the subwoofer takes over from the main speakers, while the variable phase control, sweeping 0 to 180 degrees, aligns the sub with those speakers for a clean blend rather than a smeared one. Spend a few minutes here and the Sub 300's output feels like an extension of your speakers, not a separate source of bass.\u003c\/p\u003e\u003ch5\u003eA Compact Cabinet in Two Finishes\u003c\/h5\u003e\u003cp\u003eEven with the larger driver, the Sub 300 stays manageable at roughly a foot tall, so it fits rooms where a traditional floor-shaking subwoofer would dominate. Matte black and matte white finishes match the MSX satellites and Cambridge Audio's L\/R active speakers, keeping a larger system visually consistent.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0555\/5073\/8528\/files\/cambridge-audio-msx-sub-300-front-inline.jpg\" alt=\"Cambridge Audio MSX Sub 300 subwoofer, Black, front view\" style=\"width:100%;max-width:1000px;height:auto;border-radius:12px;margin:16px 0;\"\u003e\u003c\/p\u003e\u003ch5\u003eConnections and Setup\u003c\/h5\u003e\u003cp\u003eThe Sub 300 takes a low-level RCA input from a subwoofer output, an AV receiver's sub pre-out, or a stereo preamp, and offers an RCA pass-through to feed another component. Auto-on brings it up when it senses a signal and returns it to standby when the room goes quiet. Setup is straightforward: one cable, then level and crossover dialed in, with phase set to taste and the sub handling its own power.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0555\/5073\/8528\/files\/cambridge-audio-msx-sub-300-detail-inline.jpg\" alt=\"Cambridge Audio MSX Sub 300 rear connection panel, Black\" style=\"width:100%;max-width:1000px;height:auto;border-radius:12px;margin:16px 0;\"\u003e\u003c\/p\u003e\u003ch5\u003eMore in the Cambridge Audio MSX Series\u003c\/h5\u003e\u003cp\u003eThe MSX Sub 300 is the larger, more powerful subwoofer in Cambridge Audio's MSX modular range.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"\/products\/cambridge-audio-msx-sub-200-subwoofer\"\u003eMSX Sub 200\u003c\/a\u003e\u003c\/strong\u003e - The more compact active sub for smaller rooms.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"\/products\/cambridge-audio-msx10-compact-satellite-speaker\"\u003eMSX10\u003c\/a\u003e\u003c\/strong\u003e - The compact satellite the Sub 300 partners in a modular system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"\/products\/cambridge-audio-msx20-compact-satellite-speaker\"\u003eMSX20\u003c\/a\u003e\u003c\/strong\u003e - The larger dual-driver satellite.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch5\u003eThe Listening Room Difference\u003c\/h5\u003e\u003cp\u003eWe're a third-generation family business with a brick-and-mortar showroom in Chestertown, Maryland, and a reputation built on exceptional service and relentless passion for hifi. Whether you're visiting in person or ordering online, we bring decades of experience, personalized service, and honest guidance to every interaction. We don't just ship boxes. We help build systems, answer your questions like real humans, and make sure every detail of your setup is right, from the cables to the final connection. Our passion is helping you get the most out of your gear, with support that lasts well beyond the sale.\u003c\/p\u003e\u003ch5\u003eCambridge Audio MSX Sub 300 Specifications\u003c\/h5\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#f3f3f3;padding:12px; width:34%;\"\u003e\u003cb\u003eAmplifier Power\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px; width:66%;\"\u003e300W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#f3f3f3;padding:12px;\"\u003e\u003cb\u003eDriver\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;\"\u003e1 x 8\" active, 1 x 8\" passive radiator\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#f3f3f3;padding:12px;\"\u003e\u003cb\u003eFrequency Response\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;\"\u003e31Hz (-6dB) - 200Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#f3f3f3;padding:12px;\"\u003e\u003cb\u003eCrossover\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;\"\u003eActive, variable 50Hz - 200Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#f3f3f3;padding:12px;\"\u003e\u003cb\u003ePhase\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;\"\u003eVariable 0 - 180 degrees\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#f3f3f3;padding:12px;\"\u003e\u003cb\u003eInputs\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;\"\u003e1 x low-level RCA pair\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#f3f3f3;padding:12px;\"\u003e\u003cb\u003eOutputs\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;\"\u003e1 x RCA pass-through pair\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#f3f3f3;padding:12px;\"\u003e\u003cb\u003eAuto-On\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#f3f3f3;padding:12px;\"\u003e\u003cb\u003eDimensions (W x H x D)\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;\"\u003e10.4 x 12.4 x 10.9\" (266 x 315 x 278mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#f3f3f3;padding:12px;\"\u003e\u003cb\u003eWeight\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;\"\u003e16.5 lbs (7.5kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#f3f3f3;padding:12px;\"\u003e\u003cb\u003eFinishes\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;\"\u003eMatte Black, Matte White\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#f3f3f3;padding:12px;\"\u003e\u003cb\u003eIn the Box\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;\"\u003eSubwoofer, power cable, safety guide, quick start guide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Cambridge Audio","offers":[{"title":"Black","offer_id":42879229460576,"sku":"CAMBMSXSUB300BL","price":549.0,"currency_code":"USD","in_stock":true},{"title":"White","offer_id":42879231885408,"sku":"CAMBMSXSUB300WH","price":549.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/5073\/8528\/files\/cambridge-audio-msx-sub-300-black-three-quarter.jpg?v=1781604796","url":"https:\/\/listenroom.com\/products\/cambridge-audio-msx-sub-300-subwoofer","provider":"The Listening Room","version":"1.0","type":"link"}