Anyone install the JBL A-pillars in the 1958 without any other audio modifications? If so, how do they sound? I have seen that this can be done and is really easy and plug and play. However, the head unit and potentially other audio upgrades were also made to the 1958 that I seen it done on. It was reported that the tweeters are a noticeable and nice upgrade. Does the 1958 need an amp to add these tweeters?
