Hi. I'm looking for any insight anyone has into running cable from an amp inside to some permanently installed outside speakers. Some info: I don't have an attic. The walls are thick and made of granite, therefore drilling is a problem uPVC windows, so perhaps something can be done there? This is likely to be a semi-temporary arrangement until we bother to get the garden properly done and re-assessed, however it would be useful if it a) wasn't an eyesore and b) was permanent enough that the weather is not going to fuck with it meantime. Assistance/comments/advice please!