Problems setting up assembled AMP6-basic with speakers

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My assembled Amp6-basic just arrived, which I intend to hook up with two Monacor SP-60's. This is the first time that I am doing anything like this, and for some reason I can't get it working.

I have read about it a lot, but the setup part seems so easy that I can't find any threads about it.

I have tried connecting it both to a 12V lead-acid battery and to an outlet with a 12V transformer.
Both of the speakers are connected to the input conntacts, and the audio cable is connected with my iPhone to the amp.

The only thing that I can think of that might be the problem is that the power contact is sized 2.5/5.5 instead of 2.5/5.0.

Anyone who can help me with this?
Could the power contact be the problem?
 
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