It makes no difference, they are still wirewound, however, I would suggest you try measuring their inductance - for audio frequencies, particularly at lower frequencies, the inductance is rarely a problem. Not to mention, finding non-inductive high power resistors is going to be difficult, and incredibly expensive.
Edit: I just tested a 1 ohm 7W wirewound resistor, and it reads 1uH at 200KHz. This would only be 0.13 ohms at 20KHz.
What you don't want to do, it use them for radio frequency loads