which is a better sub amp lab or crown

MarjanM wrote: Who cares which trick they use? What maters is how they sound when you put them side by side.

Yes, but what is pleasant to hear for the ears with a pair of boxes may not the best for building large scale system,
if the components do not follow the requirements of physics.

Let me show you an example, sometimes a small clipping amplifier without good damping and phase response could have better sound effect on a pair of speakers such bass-reflex boxes than a proper amp.
However once building a large scale system, best damping, even phase response become dominant features otherwise the random phase uncontrolled free-floating radiator elements ruin the output.

Is the Void Infinite 8 still one of the top 2nd hand sub £1000 amps to go for?

mashgwan wrote: hello which is a better sub amp to run 4 hog scoops  a labfp6400 with 2 x 2300 at 4 ohm (an older one) or  a crown macrotech 5000i with 2 x 2500w at 4 ohm (a newer one) thanks nick

As a user of fp6400; they do sound good and are ultra-reliable but personally you won't get the full potential of pd/void loaded hogs. They will sound nice but for scoops you need something with a bit more grunt.

If you have a strict budget then Between the two I would take the lab, but for a bit more money you could get a k8 and upgrade later.
Infinite8, qsc5050hd's, even 5000vz still do the job well.