I have been on the lookout for a large Bluetooth portable speaker for my 280SL that would not clash with the classic styling of the pagoda.
I found the House of Marley – Get Together. Besides the strange name it is a good looking and good sound speaker system for the car. The front of the Get Together is a solid bamboo that looks similar to the wood trim in the pagoda. The box weighs 6 lbs / 2.7 kg and is covered in a cloth material that will keep it from sliding around on the back bench. The battery will last up to 8 hours and it has 16 Watts coming out of 4 drivers.
Best part is it sounds great, even at 65mph/100kph with the windows open.
The price is not bad at $200 (US) list, you can get one for around $170.