Can I connect 2 Mic's to BOOM?
Even though Boom only has 1 XLR input, you can still connect a second mic to the 1/4" input as long as it's a dynamic mic.
You'll just need a Line-matching Transformer:
A Line-matching Transformer is an adapter with a female XLR connector on one end and a male 1/4” connector on the other. This transformer converts the low-impedance signal of a microphone to high-impedance for connecting to a device like JAM. In this process, the transformer is providing additional gain for optimal signal level.
Also Called: Impedance Matcher, Impedance Transformer
Once connected, set input 2 to the instrument and adjust the gain just like you would for a Mic input.