I recently contacted the manufacturer of my amp to get the correct resistor values since they weren't listed on the chart. However I cannot find resistors to match the values I was given.

I was told: "In order to reach 15Hz highpass you can try R17 = 26k1 and R18= 90k9"

I think it is weird he used the word "try", like these may not be the correct values. Anyway, I cannot find any 26100 Ohm or 90900 Ohm resistors. Are resistors meant to be combined to achieve the correct values? For example, will 3 30k resistors equal 1 90k resistor?

If not, can someone tell me where to find 26k1 and 90k9 resistors? Thanks