I would need more context to be 100% sure but from the information here I would deduce that we are talking about marketing noise, which is quite a negative term, referring to the huge amount of advertising we are exposed to on a daily basis.
I think this is referring to limiting the noise in order to create a more favourable brand image of not being so 'in your face'; of using limited, effective advertising instead of saturation.

The reference is the only thing I came up with. Scroll down to see it in a sentence.

Acotado can mean many things. See RAE. In this case it could be they have a agreed a limit to the "noise" round the product.

Con el contexto limitado que tenemos.

As with Karen´s explanation, it´s difficult to be precise without more context. But I think this text is likely to be about reputation management relating to some sort of change. The internet traffic is usually referred to in this context as "background noise". "Acotado" + "positivo" is the problem here, but possibly relates to the action of the bank´s marketing department in its risk management (limitation) capacity. Hence their goal is to achieve limited, but positive, background noise. Hope this helps.

Or:
sort of a muted buzz
a muted but unmistakable buzz

"Buzz" is, I feel, a much better choice than "noise" to translate "ruido" in the context of Internet chatter/traffic around a particular person, product, company, etc.

Suerte.