Materials, labour, overhead ... You name it .... It all goes up eventually even in a low inflationary economy. You should expect it.
I would only be worried if the prices started to go down. Putting aside any thoughts of downward price changes with an erosion of quality (this is quality kit ) from the typical cheap POS Chi-fi race-to-the bottom-price race,
That is when deflation hits and catastrophic economic fallout commences. Discretionery spending in deflationary times nosedives. High discretionery items like audio equipment sales cratering triggering the demise of the suppliers will be high on the early casualty list as their sales quickly start to circle the drain.