I have a vintage hiwatt 2x15 that has the original fane speakers in it. The cab is only rated for 100w at 8 ohms. I was just wondering if it would be bad if I used say a 400w head. I don't want to blow the speakers out of my cab but I would like more power than the 100w head I'm using. The guitar player in my band seems to think it should be fine but I'm hesitant to trust him since I've had some bad experiences already with some speakers through my pa system. Any info on the subject is appreciated!