The microphone is very close to the speaker, so it is normal to scream! Howling is the "existing" sound you said), but howling can be effectively improved by the right means! For example, use an equalizer to adjust the frequency response characteristics of the sound system more straightly, use a microphone with better directivity, use a microphone with higher sensitivity, etc. ~ ~ The interference of the speaker is the quality of your wireless microphone. This is a more formal occasion for a wedding. You should choose a wireless microphone with U-shaped cross-section and diversity circuit! There are many microphones with U-segment true diversity, high sensitivity and high directivity on the market now! But diversity guys can easily buy fake diversity microphones.