underpowered

So I'm new to these forums and I'm not sure if this is a stupid question or not. So I have two floor PA speakers, (WELTON AUDIO PS412-1 TOWER SPEAKER). They have a rating of 150 W NOM (I'm assuming RMS) and 400 W max. I currently have them running them through aa Adcom GFA-535 II preamp which...

My wife gave me the green light for a SI 18" driver. I'm thinking 4 ohm per coil so it could be driven by an 8 ohm amp. I have such an amp but in bridged mode it's only 100 W. Eventually I'd like to add something like an inuke but in the mean time, are there any dangers in under-powering a...

Hi i was wondering if anybody thinks I should get a new reciever. I have two Cerwin Vega VE-12's and a Klipse Sub-12. The model number of my reciever is RX-V363. I got the receiver in christmas 2008. It was about 235 dollars at best buy. It was the cheapest Yamaha reciever there. I need to know...