sounds like "the red object"
The audio is a little hard to understand but it sounds like "with a red object" to me. If it was "with the" the "th" sound would be much longer and stretched out.
Maybe accept both anyway? I'm a English native speaker and it's still tough tell.
Unfortunately I don't think it's possible to accept both and I think it would cause more problems along the way. Thanks for the input though, we'll definitely see what we can do to improve this.