Can I make Arduino 101 AnalogRead faster? Around 20 microseconds interval...

I’m working with arduino 101 with two microphone sensors from DFRobot (DFR0034). Right now my arduino is reading with around 250 microseconds interval, but for this project I need it to read with 20 microsecond intervals to get nyquist frequency equivalent to 20kHz. Is this possible?

Test_11_2mics.ino (598 Bytes)