Monitor Audio
Monitor Audio Platinum 300 3G
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The Platinum 300 3G’s combination of MPD III transducer, 4” RDT III mid-range driver, and two 8” RDT III bass drivers allows it to deliver exceptional scale and depth. The worthy flagship of the Platinum Series 3G, this loudspeaker is quite simply the best in its class.
Key Features:
- MPD III transducer
- 4” RDT III mid-range driver
- Two 8” RDT III bass drivers
- Totally immersive sound stage
- Flagship three-way loudspeaker
- Rear-ported
- Embellished with etched inlays

"There is, I think we can all agree, a great deal of satisfaction to be derived from being in the presence of expertise"

Objects of Desire
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.
Specifications
Category |
Details |
|---|---|
| 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 @ 3.75 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: 3 kHz |
| 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 (44.5 x 16.9 x 20.6") |
| External Dimensions including Trims, Terminals & Outrigger Feet without spikes (H x W x D) | 1114.5 x 429.8 x 524.4 mm (44.5 x 16.9 x 20.6") |
| Weight (each) | 53.6 kg (118 lb 2 oz) |
| Warranty | 5 years |

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.
The definition of elegance
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.
A technical legacy with 'Concept 50' technology
Platinum Series 3G builds on two generations of loudspeaker design, which has consistently evolved at each step. We have introduced a ground-up new MPD III transducer, developed for the ‘Concept 50’ speaker, which improves on every aspect, as well as improvements to the mid and bass driver cones called RDT III - a further significant development in driver technology.
Pinpoint accuracy for lifelike sound.
New MPD III high frequency transducer. The improvements help to reduce distortion and flatten the frequency response leading to a clear and consistent sound across all your music.
Precision perfect
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, an optimised 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.
Clever design is more than skin deep
Platinum series has always represented Monitor Audio’s engineering and design prowess and the 3rd generation is no exception. Our UK based design team have worked closely with the acoustic team to deliver an aesthetic which celebrates the performance components without overpowering its surroundings.
Aluminium Driver Frames.
The drivers on the Platinum Series 3G are held in place with individually cast aluminium frames, creating two layers of isolation between the driver chassis and the cabinet.
New Outrigger Feet
The new Platinum outrigger foot assemblies have been precision engineered to form a solid platform for the floorstanding speakers while presenting a more elegant aesthetic compared to a cumbersome plinth.
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