Hi. I'm new to the forum (been reading for a while, but first post). My wife and I bought 2014 FR3 30DS in April and we've been very happy with it so far. One of my outside speakers was bad and I replaced the pair with Pyle PLMR51B Dual 5.25'' Waterproof Marine Speakers from Amazon. They were $20 for the pair when I bought them, but they are $17 right now. I thought that they would fit with no modifications, but I had to enlarge the holes slightly to get them in. If you have a Dremel, you can easily enlarge the hole. I used a file, and it took some time. I also drilled 4 new holes for each speaker. When removing the original Jensens, there was a white caulk that was very sticky and rubbery that held them in and it required some prying to get them loose. After cleaning off the old caulk, enlarging the hole and drilling the new holes, I used clear outdoor silicone caulk to seal the new ones. I'm not an audiophile, but the new speakers sound MUCH better and the price is right. Time will tell if they hold up.
We've camped 14 nights since we got the FR3 and we're very happy so far.
The modifications/fixes that I've done so far are: replaced outdoor speakers, replaced the toilet (Dometic sent new one for free due to leak/odor issue), added shelves to entry cabinet, paper towel rack, towel rings in kitchen and bathroom, black tank flusher, cup holders, Dish VIP211K receiver, fixed incorrect audio wiring and replaced screen door handle.
Let me know if you have specific questions about the speaker replacement.