Bought Sure 3x200W AA-AB35281 board, but it's hissy / not silent.

[Pygmy]

For my active speaker build I bought 2 of these:

Sure Electronics AA-AB35281 3x200W Class D Audio Amplifier Board - T-Amp

but even when nothing's connected, it's noisy.

EDIT:
Using a Connex 600W SMPS: SMPS600RS | Connex Electronic

I need advice on either how to make it silent (Don't think that's an option - but hey, if anyone's got a magic tip I'm game 🙂),
or advice on decent class D boards to provide individual amplification to my drivers.

I'm building a set of 3 way speakers, using a tweeter, full range driver, and subwoofer driver (TB 1139SIF).

I'm not looking for club volume levels, just casual listening - so the tweeter and mid don't need much watts. The 1139SIF might need some oomph since it's 83dB....

I noticed 3E Audio used to have a 3-way amp:
TPA3251-3CH-200W | 3e Audio

but I contacted him and it's out of production...

Any recommendations on decent class D amps I could use for this setup?
(A 3-way amp like 3E's would be awesome but my Google-fu has turned up zilch..)

 

[ohdsp]

What power supply are you using... might be an issue with the power supply?

 

[Pygmy]

I'm using a fairly expensive (for me at least 🙂) Connex 600W SMPS.

SMPS600RS | Connex Electronic

As far as I understand this should be pretty okay for class D amplifiers - the next step up would be Hypex I guess.
But I think the trouble here is the amp board, I don't think a Hypex SMPS will magically fix it.. (?)