Monitor Audio Platinum 100 3G Bookshelf Speaker

In Stock, Available Now






The Platinum 100 3G is engineered to deliver a truly exceptional listening experience from a relatively diminutive loudspeaker. With its new RDT III mid-bass driver cone and MPD III transducer, the Platinum 100 3G has been significantly improved over the previous generation, and sound is presented with a purity and precision that makes for an astoundingly engaging experience. The speaker also includes mount points for the Platinum Series Stand and the forthcoming universal stand, which will be available soon.


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.



Platinum II offers you genuine audiophile performance with stunning design and materials specification.

In the pursuit of ever lower distortion, no detail has been overlooked. Through meticulous FEA modelling, we’ve optimised the operation of electrical, mechanical, magnetic and acoustic systems, introducing new discoveries to meet ambitious performance goals.

The Platinum II range deploys an enhanced generation of RDT bass and mid-drivers, and for the first time in a Monitor Audio product, the MPD (Micro Pleated Diaphragm) high-frequency Transducer.

Including improved crossover and speaker terminal designs together with proprietary ARC, TLE, HiVe II technologies, Platinum II builds on the award-winning advances of over forty years to create a high-end speaker range that is utterly faithful to the source.


  • 1 x MPD III high-frequency transducer for a larger, clearer, and more lifelike sound
  • 1 x 6” RDT III mid-bass driver for incredible levels of clarity and scale
  • A truly exceptional listening experience from a relatively small loudspeaker
  • Rear-ported and tuned for ease of positioning without affecting sound performance
  • Perfect for smaller high-performance music set-ups, or as front/rear channels in home cinema systems
  • Mount points for the Platinum 2G Stand
  • 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: 2-Way
Frequency Response, Free-Field (-6dB): 37 Hz – 60 kHz
Frequency Response, In-Room (-6dB): 28 Hz – 60 kHz
Sensitivity (2.83 Vrms @ 1m, Free-Field): 85 dB
Nominal Impedance: 4 Ohms
Minimum Impedance (20 Hz to 20 kHz): 4.0 Ohms @ 180 Hz
Continuous Power Handling (RMS into 4 Ohms, Pink Noise with 6dB Crest Factor): 150 W
Recommended Amplifier Power (RMS into 4 Ohm, Music Signal): 75 – 300 W
Bass Alignment: Ported
Port Tuning Frequency: 44 Hz
Crossover Frequency: LF/HF: 2.85 kHz
Drive Unit Complement: 1 x 6" RDT III bass driver, 
1 x MPD III tweeter
External Dimensions including Trims, Terminals & Outrigger Feet & Spikes (H x W x D): 398 x 225 x 325.6 mm (15.6 x 8.8 x 12.8")
External Dimensions including Trims, Terminals & Outrigger Feet without spikes (H x W x D): N/A
Weight (each): 15.2 kg (33 lb 8 oz)


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.