Monitor Audio Platinum 300 3G Floorstanding Speaker

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Flagship floorstanding speakers

The Platinum 300 3G, the flagship of the Platinum Series, represents the absolute pinnacle of what is achievable at its price-point in terms of both performance and design. The combination of the innovative new MPD III transducer and the RDT III mid-range and bass driver cones, allows the speaker to deliver exceptional scale and depth. With a totally immersive soundstage and believably lifelike performance, 300 3G’s presentation of music and film is astonishing. The Platinum 300 3G’s expertly crafted design and innovative acoustic system performance, ensures that it will remain relevant for a lifetime.

Monitor Audio Platinum 300 3G Floorstanding Speaker

Platinum 3G - Objects of desire

Platinum Series 3G is a culmination of ground-breaking acoustic innovations brought together in a number of expertly crafted designs that celebrate the rich legacy of the Platinum Series. The range cements Monitor Audio’s deserved place within the high-end, premium loudspeaker space and represents a purity of sound and design beautifully entwined – the launch, a highpoint in the brands 50th Anniversary.

Elegant construction

Platinum Series has always represented Monitor Audio’s engineering and design prowess and the 3rd generation is no exception. Our UK-based design team worked closely with our acoustic engineers to deliver an aesthetic that celebrates the high-performance components without overpowering its surroundings.

The cabinet design on Platinum Series 3G is all new. Beautifully detailed and expertly crafted, our industry-leading attention to detail and passion for quality ensures that each cabinet is elegant and refined on the eyes, while being engineered for total acoustic performance.

Constructed using laminated layers of MDF to form a curved and braced super rigid 18-21mm cabinet on the rear with a 36mm thick baffle precision machined to create a unique curved front profile. The cabinets are then embellished with etched inlays to highlight the craftsmanship, before 16 layers of lacquer are added on top to create a beautiful, luxury piano gloss finish. A pure satin matte finish is applied to models finished in white - a contemporary statement in any interior.

'Concept 50 technology'

Platinum Series 3G builds on two generations of loudspeaker design, which has consistently evolved at each step. New MPD III high frequency transducer helps to reduce distortion and flatten the frequency response leading to a clear and consistent sound across all your music.

The Rigid Diaphragm Technology III (RDT III) cone has three new optimisations over its predecessor. Firstly, a new rear layer featuring two uniform layers of carbon fibre skin helps reduce cone breakup, as does an optimised rubber surround. Finally, a cone edge treatment extends the passband of the drivers. When combined, these innovations significantly increase the useable bandwidth, enabling improvements to the crossover and final response of the speaker. The result: Platinum 3G mid and bass drivers boast the lowest distortion of any Monitor Audio speaker in its history.

Monitor Audio Platinum 300 3G Floorstanding Speaker 


  • 1 x MPD III high-frequency transducer for a larger, clearer, and more lifelike sound
  • 1 x 4” RDT III mid-range driver for incredible levels of clarity
  • 2 x 8” RDT III bass drivers for exceptional scale and depth
  • Our flagship three-way loudspeaker delivers best-in-class sound
  • Totally immersive sound stage with music and film
  • Rear-ported and tuned for ease of positioning without affecting sound performance
  • Perfect for high performance hi-fi systems or home theatre
  • Cabinets are embellished with etched inlays to highlight the craftsmanship
  • Choice of three high-quality, elegant finishes: Piano Black, Piano Ebony and Pure Satin White


      System Format: 3-Way
      Frequency Response, Free-Field (-6dB): 25 Hz – 60 kHz
      Frequency Response, In-Room (-6dB): 17 Hz – 60 kHz
      Sensitivity (2.83 Vrms @ 1m, Free-Field): 88 dB
      Nominal Impedance: 4 Ohms
      Minimum Impedance (20 Hz to 20 kHz): 4.0 Ohms @ 2.5 kHz
      Continuous Power Handling (RMS into 4 Ohms, Pink Noise with 6dB Crest Factor): 400 W
      Recommended Amplifier Power (RMS into 4 Ohm, Music Signal): 200-800 W
      Bass Alignment: Ported
      Port Tuning Frequency: 32 Hz
      Crossover Frequency: LF/MF: 650 Hz, MF/HF: 3kHz
      Drive Unit Complement: 2 x 8" RDT III bass driver, 1 x 4" RDT III mid-range driver, 1 x MPD III tweeter​
      External Dimensions including Trims, Terminals & Outrigger Feet & Spikes (H x W x D): 1131.1 x 429.8 x 525 mm
      Weight (each): 53.6 kg

      The speaker accomplishes what it does honestly, without smoke and mirrors. It’s a thoughtfully designed and beautifully built product that’s imperturbable with dynamic and bass-endowed source material, and a faithful communicator of musical color and character. It’s truly a remarkable value—a lot of speaker per dollar. more...

      Due to the bespoke nature of our high-end music systems this product is not available to be purchased online. Please contact us for personalized service from one of our team of experts.