Al do a search on Quest or DVD. You'll find a lot of info. Replacement units are varied. We replaced ours with a Sony unit because we like and have had good luck with Sony products. We did not replace all the speakers because on the 3400 it is quite a job to get to the front speakers. We replaced the sub-woofer and plan on replacing the rear speakers in the slideout. We are very happy with our replacement and cost a little over $200. Welcome to the MOC and the wonderful world of Montana owners. Let us hear about your unit and all your adventures.
Happy trails..........................
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