What amp should I be looking at for 4 ohm?

I have a 5.1 Home theater set up, running on a Denon AVR-x2400H.

My speakers dip down to 4 ohms, even lower at some points. (Zaph 5.3T, Zaph 5.3C, and surrounds).

I feel like my speakers can do better with a different amp. It feels like when I push the speakers hard, my denon can't keep up.

What amp board would you recommend? Class D? T? And is there a way I can go full on 5.1 through these boards? I am totally blank.

I have seen TPA3116D2 mentioned around a lot, will that work better than my denon?
 
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Well...reading at the link that you posted I remember the supply requirement: 24 V 4 A
Nothing else to say!
Those denon and all the home theatre equipment ( which I'm not familiar with) just use the classic bipolar couple for push pull operation. Doubling it would allow for more output current but that is not easy to achieve in 2U rack space, for 5 or 7 channels!
What you have to visually inspect is the size of the power transformer: the bigger, the better> it goes together with the request from the power stages
 
Well...reading at the link that you posted I remember the supply requirement: 24 V 4 A
Nothing else to say!
Those denon and all the home theatre equipment ( which I'm not familiar with) just use the classic bipolar couple for push pull operation. Doubling it would allow for more output current but that is not easy to achieve in 2U rack space, for 5 or 7 channels!
What you have to visually inspect is the size of the power transformer: the bigger, the better> it goes together with the request from the power stages

It doesn't have to be the link that I sent.

Is there no other board that can be better than my current Denon AVR 2400?
 
I have a 5.1 Home theater set up, running on a Denon AVR-x2400H.
...
I have seen TPA3116D2 mentioned around a lot, will that work better than my denon?

No.

I just had a peek...The Denon 2400 is specified at 95 watts per channel with low distortion for the two front (stereo) channels. With all channels going power management cuts in and you're likely getting about 60 to 70 watts per channel before serious distortion begins.

In order to top that you would have to go to external power amplifiers that, even home-brewed, would end up costing you a couple of hundred bucks per channel.

I see you went with DIY speakers, which is cool. But if they're dipping below a nominal 6 ohms impedance you will be hitting the limits of most AVR gear. I would think that looking to improve the impedance profiles of your speakers, likely though different crossovers, might give you a more satisfactory solution to the problem.