CI-1 short frequency range

[Marios]

I wanted to test the acoustic properties of my room using the Room EQ Wizard. In the first step, the audio interface is tested. The results of my CI-1 are very poor. Is it normal?

[djw]

That can't be right, you would hear a roll-off like that. Does the audio input and output sound correctly?

Also, the graph only goes to -3dB, can you extend it to go lower?