You can only be arrested in DR for playing loud music if there is a signed order by a judge or 2, if there is a pending case and were already "out-counseled" in the fiscalia or 3, if the popo show up and you make a scene and things escalate out of control. To support this, I would direct you to article 224, 27, arresto en flagrancia, arresto en situaciones de urgencia, it is true that a singed arrest order is not practical and/or necessary. However, to conduct an ordinary arrest, an order must be petitioned by the fiscal and signed by a judge.