I finally got around to upgrading my 2014 Berkshire RB from those little 2 inch speakers and will try to show what I did here.
First of all, do you guys know how to set the bass, treble and balance on the JRV212 radio?
I didn't know, but learned in the process. It is an important part of getting your sound right. Just 'press and hold' the 'Audio' button and a new menu appears.
I wanted to get an acceptable sound without a complicated and expensive install of amplifiers and crossovers.
To replace the little 2 inch speakers, I chose some Kicker 6 Inch Coaxial speakers with power handling of up to 65 watts. Some other brand might be just as good. The important thing was I did NOT want some high priced, high performance speakers that were going to require a lot of power as the Jensen radio puts out about only 40 watts per channel. I got them on Amazon http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
After looking at the ceiling where they would mount, it did not seem that cutting holes in the ceiling for larger speakers was an option. So I got these spacers from Frys Electronics. Two (2) of these needed for each speaker for a total of 2 inch depth.
I painted them white to kind of match the ceiling.
Here they are mounted and connected in the Berkshire.
Many people may be very satisfied at this point as it sounds much better than the stock 2 inch speakers once the bass and treble are adjusted, but I like a little more low end in my music.
Next up was to add a Sub-Woofer to pump up the bass.
I wanted something that would fit through the removable dash panel and sit on the floor out of sight under the dash. After much measuring and remeasuring the floor space and dash panel opening, I chose this PowerBass BTA8 also from Amazon Amazon.com : Powerbass BTA8 Single 8-Inch 150W Amp Enclosure : Vehicle Subwoofer Systems : Car Electronics
A crossover and 150 watt amp are built into the sub box, so nothing else is required to drive it.
To get the Sub in through the dash panel opening was a chore. Had to temporarily remove some heater hoses, the radio as well as the radio chassis.
But it did fit just fine.
Now we have music the way we like it.
I still need to adjust the Sub to get it just right, but we have clear vocals and musical instruments and just enough low end thump to produce music close to the way it was recorded and meant to be heard.
I tried to record something that I could link to for demonstration, but it seems a cell phone does not do a good job of that.