It's generally assumed by speaker designers that the amp will be a voltage source as opposed to a current source. Consequently, speakers are designed to behave flatly according to voltage.
All that said, I'm driving a pair of Focal 936's with a muscled up First Watt F5. The nice thing about a push-pull amp is you can get a bit more head room without hard clipping. As it sits it has a potential class A envelope of about 80 watts. But, at 8 ohm that envelope drops to 52. My Focals have a low point of 2.8 ohm. That means the class A envelope collapses to a whopping 18 watts. Sure, it will drive more power up into class AB, especially since I deleted the current limiting transistors. It's pretty easy to tell if you're pushing a class A amp out of it's envelope because they get quite a bit hotter. I've been listening to Tool's 10,000 Days here loud enough to feel it in my chair for a cool half an hour at least. The amps is still at idle temperature. It's probably not belting out 18 watts much, if at all. And if it does at that impedance low point it just transitions to class AB.
This thing is about all the amp I need and these aren't the easiest speakers in the world to drive. I have no idea why people need 500 watt amps in a normal sized room with decently sensitive speakers. I'm not sure why people get so worked up about an amp's ability to double it's current into half the load. 6moons reviewed the F5 and noted that if your speakers need more that the F5's 25 watts they're probably poorly designed and I tend to agree with that based on what I'm hearing right now. I seriously think people should listen to a simple, well designed, low power amp before they form opinions about the importance of current delivery ability and kilowatts of power potential. It sounds like @ghosthouse discovered that. I think Fist Watt amps represent exceptional, perhaps unmatched, value in terms of quality for the dollar, and I doubt much of anybody really needs more power.
All that said, I'm driving a pair of Focal 936's with a muscled up First Watt F5. The nice thing about a push-pull amp is you can get a bit more head room without hard clipping. As it sits it has a potential class A envelope of about 80 watts. But, at 8 ohm that envelope drops to 52. My Focals have a low point of 2.8 ohm. That means the class A envelope collapses to a whopping 18 watts. Sure, it will drive more power up into class AB, especially since I deleted the current limiting transistors. It's pretty easy to tell if you're pushing a class A amp out of it's envelope because they get quite a bit hotter. I've been listening to Tool's 10,000 Days here loud enough to feel it in my chair for a cool half an hour at least. The amps is still at idle temperature. It's probably not belting out 18 watts much, if at all. And if it does at that impedance low point it just transitions to class AB.
This thing is about all the amp I need and these aren't the easiest speakers in the world to drive. I have no idea why people need 500 watt amps in a normal sized room with decently sensitive speakers. I'm not sure why people get so worked up about an amp's ability to double it's current into half the load. 6moons reviewed the F5 and noted that if your speakers need more that the F5's 25 watts they're probably poorly designed and I tend to agree with that based on what I'm hearing right now. I seriously think people should listen to a simple, well designed, low power amp before they form opinions about the importance of current delivery ability and kilowatts of power potential. It sounds like @ghosthouse discovered that. I think Fist Watt amps represent exceptional, perhaps unmatched, value in terms of quality for the dollar, and I doubt much of anybody really needs more power.

