Hi, I’m building a pair of floor-standing speakers. The height is about 120 cm. Width 29 cm. And depth 36 cm. At first, I planned to use the 20 mm. MDF as the cabinet walls and 1-inch thick MDF for bracings inside the cabinet, as seen in some commercial speakers. I went to my local carpenter shop, he usually build car speaker enclosures, and had him build my speaker cabinets. Unfortunately, he used wrong thickness on my pair. He used 12 mm. MDF totally, the bracing construction and dimension are correct every point though. He offered me discount for these cabinets due to his mistake. I’m now hesitate whether I should accept his offer or not. Could anyone please tell me what is the result of using thin cabinet wall? What way will the sound go and affect? I’d like to know if the sound is distorted, how? Bass boom, Midrange echo, etc. Please explain me. Thank you in advance.