Hello, I'm TV Tech1 and I'll be working with you to identify and help you resolve your problem.
Some of these micro speakers just can't deliver good sound on certain models. Depending, speakers that fire their audio DOWN instead of out the FRONT of the TV set will suffer volume and muffled sound issues. These downfiring speakers expected a hard surface below them to reflect the sound out towards the customer.
Wall hung TVs and TVs sitting on a cloth under the TV stand seem to have the worst audio quality. I don't know if this applies to your situation, but if it does, let me know.
Also, it would be nice to know the model number of your TV set. In most cases, you'll find your TV's model number here --
TV on Stand
Plenty of space behind