It is a subject which has not been given near enuff discussion yet. Do note that when people start talking about tube” amplifiers, they do not know that what they are really talking about is amplifier output ressiance Rout.
We see this when people directly compare the ACA to 300B SE amps.
Also worth noting that there is no technical reason for a Class AB amplifier not to have a high R[s5ub]out[/sub]. There is a thread on an LM3875 amplifier with a high Rout. Based on the work done by Daniel (Duo) and the one he did had a knob on it that allows one to change the Rout from very little to a lot. It is very eye opening playing with that knob. He also did a discreet bipolar version, it was even better.
dave
What Dave said.
It's normal enough with wideband units, or at least it was traditionally, when some amplifiers even had a variable output impedance to allow people to dial things in as desired. The older E and En series Fostex units, along with the ESigmas, are also largely intended for use with SET amplifiers or equivalent electrical correction; ditto many Lowther etc. models with high levels of electromechanical damping. Somewhere along the line though, some of this seemed to get forgotten, or at least overlooked, except in a relatively broad sense. But yes, with single driver and HE systems in particular, the interface and matching between amplifier - wire - speaker electrical characteristics can be quite a significant component. Less so with the majority of modern lower-efficiency multiways, since if you want them to behave as intended, they'll typically need a voltage source, since that was the assumpion, deliberately or otherwise, underpinning the design.
It's normal enough with wideband units, or at least it was traditionally, when some amplifiers even had a variable output impedance to allow people to dial things in as desired. The older E and En series Fostex units, along with the ESigmas, are also largely intended for use with SET amplifiers or equivalent electrical correction; ditto many Lowther etc. models with high levels of electromechanical damping. Somewhere along the line though, some of this seemed to get forgotten, or at least overlooked, except in a relatively broad sense. But yes, with single driver and HE systems in particular, the interface and matching between amplifier - wire - speaker electrical characteristics can be quite a significant component. Less so with the majority of modern lower-efficiency multiways, since if you want them to behave as intended, they'll typically need a voltage source, since that was the assumpion, deliberately or otherwise, underpinning the design.
I've never actually heard a tube amp myself. I've only heard class AB and class D. Between the two I've not really heard anything that would suggest ones class D and ones AB. Only heard my TPA3255 though.
I'd like to hear a SET amp but I'm not sure where to start with them. I don't think they'll have enough power for me either
That's interesting to hear, Scott. I take it Mark audio drivers are designed to be more versatile with the range of amps they can work with?
My electronics knowledge is very poor, whenever I try to learn more about it, it just goes in one ear and out the other (or one eye and out the other)
I'd like to hear a SET amp but I'm not sure where to start with them. I don't think they'll have enough power for me either
That's interesting to hear, Scott. I take it Mark audio drivers are designed to be more versatile with the range of amps they can work with?
My electronics knowledge is very poor, whenever I try to learn more about it, it just goes in one ear and out the other (or one eye and out the other)
I see, definitely another thing to think about when I start making some designs for myself. At the moment I'm happy to stick with yours and Scott's designs. Seems like there's more to it than just plugging the numbers in winisd 😀
Just trying to fight the urge of purchasing the 11ms right now, since I've bought too many speakers lately haha. I am planning on waiting at least a month or two but we'll see. Really curios to see how they compare to the 7ms. The 7ms are my first diy and first fullrange speaker so I've got a lot to hear
Just trying to fight the urge of purchasing the 11ms right now, since I've bought too many speakers lately haha. I am planning on waiting at least a month or two but we'll see. Really curios to see how they compare to the 7ms. The 7ms are my first diy and first fullrange speaker so I've got a lot to hear