Started in on this project tonight, got the left speaker cut to fit and tried a sound test using the 1/8" input in left pocket from iPhone out. Balance control is available in Accessibility options to A/B them, audio output set to Mono.
They are certainly not more efficient than the stock speakers, but they do shine in the high end. If you need more treble these are a great fix. Hi-hat on Travelin' Man sounded like it was in the garage with me.
I've tested the stock speakers against some 94db (rated) Cerwin-Vega XED62 and the stock were louder. Amazing.
The JBL midrange didn't punch the way the stocks do. This is not necessarily a good thing for home speakers but it seems like the stocks are optimized for the cabinets and to be heard over riding noise.
The JBLs would probably sound great in a system that had some larger speakers to help out with the bass, would likely sound great
inside a vehicle.
I used speaker sealing gasket when installing, so leakage wasn't a factor with the bass.
For as loud as the stock "woofers" are, the tweeters don't seem to keep up. I'll be looking for and testing out a few, may have to get creative with installation.
Since this isn't critical listening I'm not ruling out Piezo.
If any local riders want to buy my JBL GTO638s for $25 respond below and we'll meet up, don't want to mess with shipping. One is already trimmed to fit, I will make the cut suggested by WillTill(
) on the other speaker also so your instrument console cover fits, I'll let you trim the other 2 sections on the right speaker. I pitched the grills and box as soon as I got them, so grills and box not included.
Would also trade 1:1 for a set of stock speakers.