Help Me Choose an Amp?

[dthrckt]

I'm building a set of portable speakers from a set of computer speakers.
They had 4" and 2" diameter (outer edge) speakers mounted on the inside of the face.
I'm replacing those with the drivers/crossovers from nano neos,
Dayton ND20FA-6
Dayton Audio ND20FA-6 3/4" Neodymium Dome Tweeter 275-030
and
Dayton N105-4
Dayton Audio ND105-4 4" Aluminum Cone Midbass Driver 4 Ohm 290-212
they arrive tomorrow, and I suspect I'll be unhappy with the sound from the 25w (total) amp that's in the speakers.

I'm trying to decide between these two:
2x15W @ 4 Ohm TA2024 Class-D Audio Amplifier Board Only 320-330
2x25W @ 4 Ohm TDA7492 Class-D Audio Amplifier Board Only 320-332

The difference in cost is irrelevant (to me).

The first one is 12V - big plus...easy to power from battery or vehicles.

But the second has a lot more power...

they'll be used outdoors, so I'm sure I'll frequently push them as hard as the driver/box combination would allow...

Is the first amp good enough?

Thanks!

 

[dthrckt]

I forgot to mention - I'm open to any other amp someone might suggest, too. 😀

 

[vacuphile]

The midbass is a very nice driver but not very efficient, but it can handle some good power, so I would go for the TDA7492.

 

[xrk971]

Look at the TPA3116d2 thread. Very nice sounding $17 amp with 40 watts at 0.1% THD when driven by cheap 19v laptop SMPS power supply. Better sounding than comparable priced Tripaths in my opinion.

 

[dthrckt]

I'll check out the thread, but I'm not sure what the benefit of the TPA3116d2 would be - unless it is enough power, w/o being too much (so I'd get longer battery life).

What I'd like to find is a 12V, 40-50 watt amp. I found some that are 2.1ch on ebay, but I don't know enough about components to tell if they're any good. I also don't like that they have 3 separate dial controls (for volume?).

 

[xrk971]

Benefit of Tpa3116d2 is better sound. Battery life will depend on how loud you play - as these are class D pulse width modulation amps, they only use the power that is needed so if you play low volumes, it doesn't matter of amp is rated higher watts as that gives higher head room. The 3116 has very low quiescent current draw, lower than Tripath IIRC. If you are good with 6 watts at 0.1% THD (which really is approximately same rating as Tripath at similar THD levels), the TPA3110D2 on the Sure $10 board from PE also sounds very good and is great at low power consumption.

 

[dthrckt]

Would I need a pre-amp for TPA3122D2 or the 2x25w?

I see some mention of that on the 2x25w page.