I am unable to get the seat back by myself. Not supposed to be doing lifting (after hip replaced). I need to get some friends over and replace seat. Then I will be able to see how they work or are muffled. They sound great now on vol. at 15, ran it up to 40 with no distortion. But true test is with the seat back on as the area underneath on these trucks is not wide open. Should be getting help this weekend. I will let you know. Tom
