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Monitor Audio Platinum 300 3G Review
Monitor Audio Platinum 300 3G

Main Features

  • 1" Tweeter
  • 4" RDT III Midrange
  • 2 x 8" RDT III Woofer
  • 17-60k Hz​ Frequency Response
  • 88dB Sensitivity
  • Impedance: 4ohms
  • Power Range: up to 400watts
  • Weight:118.00 lbs / 53.60 kg
  • Dimensions(HxWxD): 44.5"x16.9"x20.6" / 1131.1 x 429.8 x 525 mm​
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Monitor Audio Platinum 300 3G Review
Monitor Audio Platinum 300 3G Monitor Audio Platin...
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Monitor Audio Platinum 300 3G is a 3-way Passive Bass Reflex Floor-standing speaker by Monitor Audio. It features a 1" Tweeter, 1 x 4" Midrange and 2 x 8" RDT III Woofer. The speaker has a frequency range of 17-60k Hz​ and a sensitivity of 88dB. Monitor Audio Platinum 300 3G has an MSRP of 17900$ per pair.

Room Size Suitability

The size of the room where you plan to use the Monitor Audio Platinum 300 3G is a crucial factor in your decision. We have assessed its suitability for various room sizes based on its dimensions and maximum power output:

Listening Environment* Suitability
Near-fieldBad
Small RoomPoor
Mid-size RoomAverage
Large RoomGood
Very Large RoomAverage

(* Approximate Room sizes: Small < 100sq. ft / 9 m2, Mid-size: 100-220 sq. ft / 9-20 m2, Large 220-400 sq. ft / 20-36 m2, Very Large: > 400 sq. ft / 36 m2. Average Floor Height: 9" / 2.7m. Typical room sizes differ from country to country, and the actual listening experience changes depending on floor height, room shape, surface materials, listening position, speaker locations, etc.)

Monitor Audio Platinum 300 3G  Lifestyle
Monitor Audio Platinum 300 3G Lifestyle

Monitor Audio's Platinum 3G Series of Loudspeakers

Platinum 300 3G is a member of Monitor Audio's Platinum 3G series of Passive speakers. Below you can see the main specs of these speakers.

Monitor Audio Platinum 3G Series Speakers
Model Frequency SensitivityImpedance Woofer
Monitor Audio Platinum 100 3G
Compare
28-60k Hz 85dB4Ω 1 x 6"
Monitor Audio Platinum 300 3G
17-60k Hz 88dB4Ω 2 x 8"
Monitor Audio Platinum 200 3G
Compare
23-60k Hz 88dB4Ω 1 x 6"
Monitor Audio Platinum C250 3G
Compare
30-60k Hz 88dB4Ω 2 x 5"
Monitor Audio Platinum 3G Series Speakers
Monitor Audio Platinum 3G Series Speakers


**This post contains affiliate links, and I will be compensated if you make a purchase after clicking through my links. As an Amazon Associate I earn from qualifying purchases.

Frequency Response of the Monitor Audio Platinum 300 3G Speaker

Monitor Audio Platinum 300 3G has a Frequency response range of 17-60k Hz​ at ±3dB and Power Range of up to 400 watts. With a minimum frequency of 17 Hz, Platinum 300 3G delivers deep bass that will likely satisfy most listeners, especially those who enjoy music. However, movie enthusiasts and music fans who prefer a full range of sound may still benefit from adding a subwoofer.

Visit our Powered Subwoofers section to find out more about the available subwoofer options.
Here we have a comparison of how Platinum 300 3G's Low and High frequency values compare with the average, max and min Low and High frequency values in its class.
Low Frequency
Floor-standing Speakers
Monitor Audio Platinum 300 3G
Min
Average
Max
High Frequency
Floor-standing Speakers
Monitor Audio Platinum 300 3G
Min
Average
Max
Monitor Audio Platinum 300 3G Woofer
Monitor Audio Platinum 300 3G's RDT III Woofer

On the treble side, with its upper limit of 60 kHz, Monitor Audio Platinum 300 3G has the highest frequency level among the Floor-standing speakers in our database.


Monitor Audio Platinum 300 3G Tweeter
Monitor Audio Platinum 300 3G's MPD III Tweeter

Crossover frequency of the Monitor Audio Platinum 300 3G?

Platinum 300 3G is a 3-way speaker and its crossover frequency between the woofer and the midrange set to 650Hz and the Crossover frequency between the midrange and the tweeter is set to 3000Hz.

Impedance and Sensitivity

Monitor Audio Platinum 300 3G's nominal impedance level is 4 ohms but can go down to as low as 4 ohms, and has a sensitivity of 88dB.

Sensitivity
Floor-standing Speakers
Monitor Audio Platinum 300 3G
Min
Average
Max

Nominal Impedance of the 4 Ohms means that the Monitor Audio Platinum 300 3G is a difficult to drive speaker from nominal Impedance perspective, make sure that you choose an amplifier than can provide 4 Ohms for this speaker.
Many AVRs (audio/video receiver) in the market may have difficulty when the speakers dip below the 4 Ohms levels (this may cause clipping or even physical damage), so we recommend to not pair the Monitor Audio Platinum 300 3G with an AVR but use an Integrated Amplifier instead.

Sensitivity

88dB of the Monitor Audio Platinum 300 3G is an average sensitivity for stereo speaker so it is neither easy nor difficult to drive Sensitivity wise.

Check the amplifiers that are in a similar price range to the Monitor Audio Platinum 300 3G:

  • Integrated Amps under 5000 USD
  • Integrated Amps under 10000 USD
  • Integrated Amps under 20000 USD
  • All Integrated Amplifiers

Input Type

Platinum 300 3G has Binding post type connectors and lets bi-amping/bi-wiring. Bi-wiring can enhance the overall transparency of your loudspeakers by using separate speaker wires for the low and high-frequency drivers from a single amplifier. Bi-amping, on the other hand, involves using separate amplifiers for the high and low-frequency drivers, potentially resulting in a greater dynamic range and reduced distortion.

Monitor Audio Platinum 300 3G Back View
Monitor Audio Platinum 300 3G Back View

Monitor Audio Platinum 300 3G External Dimensions and Weight

Monitor Audio Platinum 300 3G has external dimensions of (Height x Width x Depth) 44.5 x 16.9 x 20.6-inch (1131.1 x 429.8 x 525 mm​ ).

Base Surface Area
Base surface area of a loudspeaker may become a determining factor when the space in your room or desk is limited. The base area of Monitor Audio Platinum 300 3G is approximately 2257.5cm2 / 349.9inch2.

To get a better perspective on the real life size of Monitor Audio Platinum 300 3G, let's compare it with a standard size Compact Disc which has a diameter of 4.7inch (120mm).

Monitor Audio Platinum 300 3G Real Life Body Size Comparison
Monitor Audio Platinum 300 3G Speaker Size Compared to a Compact Disc

Here we place the Monitor Audio Platinum 300 3G virtually next to a standard width amplifier and turntable on a media center to get a better idea about the size.

Monitor Audio Platinum 300 3G placed next to a Media Stand
Monitor Audio Platinum 300 3G Floor-standing Speaker next to a Media Stand

Weight

The Monitor Audio Platinum 300 3G weighs 53.60kg / 117.9lbs per piece. Here is a comparison of how Platinum 300 3G's weight compares with the average, max and min weights in its class.

Weight
All Floor-standing Speakers
Monitor Audio Platinum 300 3G
Min
Average
Max
Weight
Floor-standing Speakers under $20000
Monitor Audio Platinum 300 3G
Min
Average
Max

Cabinet type and Materials

Monitor Audio Platinum 300 3G has a Bass Reflex type cabinet. Bass Reflex type loudspeakers (aka Ported, Vented or Reflex Port) have enclosures that uses a port, hole or vent cut into the cabinet. Ported designs are generally more efficient than the Sealed designs.

Port Position

Monitor Audio Platinum 300 3G is a rear-firing port speaker so you have to make sure you leave enough space between the back of the speaker and wall or bookshelf so that it has room to breathe.

Monitor Audio Platinum 300 3G  Port
Monitor Audio Platinum 300 3G Port

Available colors

Monitor Audio Platinum 300 3G is available in Piano Black, Piano Ebony and Satin White.

Recommended Accessories

Here is a list of accessories that we think you may need for the Monitor Audio Platinum 300 3G.

  • Speaker Cable and Connectors
    • Speaker Cables with Banana Plugs: If you know the lenght of the cable you need, this is the easier option to connect your speakers with your amp.
    • Speaker Cables without Connectors: If you are not sure about the lenght or need longer than standard cables with plugs, choose this option.
    • Banana Connectors and Plugs: If you chose the cables without connectors option or already have some cable around, pick the banana plugs separately.
  • Vibration Isolators: IsoAcoustics isolators more affordable options too.
  • Acoustic Panels and Treatments: Your room is as important as your stereo equipment so acoustic treatments goes a long way in improving the overall performance.

User's Manual

For more information about how to setup, use and maintain the Monitor Audio Platinum 300 3G, use the direct link below to download the official manual document:
Download User Manual for Monitor Audio Platinum 300 3G

Official Brochure

Here is a link to download the official brochure for the Monitor Audio Platinum 300 3G speaker:
Official Brochure for Monitor Audio Platinum 300 3G

Official Product Page

Official manufacturer's product page for the Monitor Audio Platinum 300 3G speaker can be found below:
Official Product Page for Monitor Audio Platinum 300 3G

Warranty

5 Years of parts warranty and 5 Years of labor warranty is generally provided by the manufacturer.

Monitor Audio Platinum 300 3G Alternatives in Passive Floor-standing Speakers
Model Type Sensitivity Impedance Frequency
Monitor Audio Platinum 200 3G
Compare
3-way 88dB 4 ohms 23-60k Hz
B&W 702 S3
Compare
3-way 90 dB 8 ohms 46-28k Hz
KEF Reference 5 Meta
Compare
3-way 88 dB 4 ohms 40-35k Hz
Wharfedale Elysian 4
Compare
3-way 92 dB 4 ohms 30-22k Hz
Monitor Audio Platinum 100 3G
Compare
2-way 85dB 4 ohms 28-60k Hz​
Monitor Audio Platinum C250 3G
Compare
3-way 88dB 4 ohms 30-60k Hz​
B&W 703 S3
Compare
3-way 90 dB 8 ohms 46-28k Hz
ELAC VELA FS 409
Compare
3-way 89 dB 4 ohms 28-50k Hz
Frequently Asked Questions about Monitor Audio Platinum 300 3G
What is the External Dimensions of Monitor Audio Platinum 300 3G
What is the Speaker Sensitivity of Monitor Audio Platinum 300 3G
is the Monitor Audio Platinum 300 3G an easy to drive speaker?

Monitor Audio Platinum 300 3G Detailed Specifications

General
BrandMonitor Audio
Full Model NameMonitor Audio Platinum 300 3G
Speaker Type3-way Floor-standing
Power Rangeup to 400 watts
Sensitivity88dB
Impedance4 ohms
Frequency Response17-60k Hz​
DRIVERS
Woofer Size8-inch
Woofer CompositionRDT III
Tweeter Size1-inch
Midrange Size4-inch
Crossover freq650 Hz​ - 3000 Hz
Port Positionrear

CONNECTIONS
Connector TypeBinding post
Biamp InputsYes
Port Positionrear
PHYSICAL SPECS
Height1131.0mm ( 44.5-inch)
Width430.0mm ( 16.9-inch)
Depth525.0mm ( 20.6-inch)
Height1131.0mm ( 44.5-inch)
Weight53.60kg ( 118.00 lbs)
EnclosureBass Reflex
Available ColorsPiano Black, Piano Ebony, Satin White
Mounting BracketNo
Moisture ResistanceNo
OTHER
Handheld RemoteNo
Parts Warranty5 Years
Labor Warranty5 Years
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