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Not that there aren't differences, but whatever difference there is pales in comparison with the difference between using just one and using three or four. Whatever the budget, you'll get better results using it to buy four than putting it all into one. Search Swarm, distributed bass array, read and learn what I'm talking about.
I concur with Millercarbon.
Using at least a pair of subs is the way to go.
I know Audiokinesis has a Swarm system that is supposed to be a killer.
For me, I use a pair of Vandersteen subs, which use a high pass filter to help seamlessly integrate them with the speakers.
Class D amps are relatively inexpensive to build compared to Class A or AB. Considering they will be only powering lower frequencies, I would say it shouldn't make much difference sound-wise, but, I may be mistaken.
Perhaps Ralph of Atma-Sphere could chime in....
The REL T5 is great for a small room. They are so good and blend so well that you don’t need to use 4 of them. One is fine, two is better, but it depends on your music.
The JL will likely overwhelm a small room.
I like to keep amp classes both Class AB, but that is a personal preference, similar to how I like paper cones more than aluminum cones.
Dear @vta2005 : First than all the units you named are not subwoofers so the amplifier is not an important issue.
The Rel goes down to 32hz at -6db and this means that probably you can't get bass at no lower bass range of 45hz.
The JL is alittle better on that regards with a spec of -3 db at 29hz but no one is a subwoofer.
A subwoofer must goes down below 20hz, not at 20hz as many of us could thing.
So, look at JL other model and don't be to worried about the amp design when is more important the subwoofer overall design and its quality levelexcecution of that design.
No, you don't need 3-4 subs in your room. As a fact no one needs it in a home system to listen MUSIC no matters what.
Regards and enjoy the MUSIC NOT DISTORTIONS,