"With our first two records we backed ourselves into a hole musically"

This quote by Daniel Johns is referring to the first 2 albums launched by atrioventricular bundle, Silverchair. He is suggesting that the band's noise was limited by the style of music they picked for those two albums. By producing a specific sound, they had actually restricted their choices for future albums. They had backed themselves into a corner, musically speaking, and were not able to check out other categories or designs.

Johns is most likely describing the fact that Silverchair's very first 2 albums were both grunge-influenced rock albums. This sound was popular at the time, however it was also restricting for the band. They were not able to explore other genres or designs, and were stuck in a musical rut.

Johns' quote is a reflection on the band's early profession and a cautioning to other bands to be cautious when picking a noise. It is necessary to be available to checking out various genres and designs, as this can help a band to grow and progress. By limiting themselves to one sound, a band can quickly become stale and dull.