Monitor Audio Platinum 300 3GPlatinum 300 3G The Platinum 300 3Gs combination of MPD III transducer, 4 RDT III mid range driver and two 8 RDT III bass drivers allow 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. 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.