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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 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.

What size of room is the Monitor Audio Platinum 300 3G speaker good for?

The size of the room in which you are planning to use the Monitor Audio Platinum 300 3G is an important decision factor. Here we have evaluated its suitability to various sizes of environments considering its size and max power parameters:

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.)

What are the speakers in Monitor Audio's Platinum 3G Series?

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 200 3G
Compare
23-60k Hz 88dB4Ω 1 x 6"
Monitor Audio Platinum 300 3G
17-60k Hz 88dB4Ω 2 x 8"
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.

What is the 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. At a minimum frequency of 17 Hz, Platinum 300 3G will provide a deep bass that will probably satisfy majority of listeners, especially for music. Movie lovers and music listeners who like to experience a full range response will still benefit from the use of a subwooofer though.

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

What is the Crossover frequency of 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.

What are the Impedance and Sensitivity of the Monitor Audio Platinum 300 3G? Is it an easy-to-drive speaker?

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 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 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 provide improvements in the overall transparency of your loudspeakers by running separate speaker wires to the low & high frequency drivers from a single amplifier. Bi-amping allows the use of separate amplifiers for the high & low frequency drivers of your loudspeaker which may result in greater dynamic range & lower 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.

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.

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

Monitor Audio Platinum 300 3G Alternatives in Passive Floor-standing Speakers
Model Type Sensitivity Impedance Frequency
B&W 702 S3
Compare
3-way 90 dB 8 ohms 46-28k Hz
B&W 703 S3
Compare
3-way 90 dB 8 ohms 46-28k Hz
Wharfedale Elysian 4
Compare
3-way 92 dB 4 ohms 30-22k Hz
ELAC VELA FS 409
Compare
3-way 89 dB 4 ohms 28-50k Hz
McIntosh XR100
Compare
4-way 87 dB 8 ohms 30-45k Hz
KEF R11
Compare
3-way 90 dB 8 ohms 46-28k Hz
B&W 702 S2
Compare
3-way 90 dB 8 ohms 46-28k Hz
JBL HDI-3800
Compare
2-way 92 dB 4 ohms 37-30k Hz
Klipsch Cornwall IV
Compare
3-way 102 dB 8 ohms 34-20k Hz
MartinLogan Motion XT F200
Compare
3-way 92 dB 4 ohms 27-25k 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 Warranty
Labor Warranty
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