Buy MXL 550/551 Microphone Ensemble with fast shipping and top-rated customer service. But what I find interesting about the 550 is the capsule appears to use a white plastic diaphragm retainer ring - not brass like most other K67-type MXL mic … The MXL 550 is a robust vocal condenser microphone … $120.00 +$25.00 shipping. The 551 is definitely a painted 603, but the 550 is a new body design, similar to the R44 / R144 ribbon. Ideal for quality-oriented but budget-mindful musicians, the MXL 550/551R Ensemble includes the MXL 550 and MXL 551. This all-in-one Recording Ensemble delivers outstanding performance for both vocals and instruments. Make Offer - LOT 2x MXL 550/551 Condenser Microphone Ensemble Kit (Blue) Case, Mics, … LOT 2x MXL 550/551 Condenser Microphone Ensemble Kit (Blue) Case, Mics, Clips. Ideal for quality-oriented but budget-mindful musicians, the MXL 550/551R Ensemble includes the MXL 550 and MXL 551. The MXL 550 is a robust vocal condenser microphone … Newegg shopping upgraded ™ This all-in-one Recording Ensemble delivers outstanding performance for both vocals and instruments.