Check out the mango ukes at
Hawaiian Music Supply: there are sound clips with most of the listings, so you can get a good idea of the mango tone. I finally bit the bullet and sprung for a mango uke (actually two—I'll sell whichever I like less—but they haven't arrived yet). Mango is often described as blending the warmth of mahogany with the brightness and clarity of acacia. (Of course, the quintessential topwood for brightness and clarity is spruce, with cedar being a warmer alternative.)
Bear in mind, these descriptions are based on seasoned instruments, while comparative and review clips are generally of spanking new instruments. I give a new instrument at least a six months' chance before deciding whether to keep it, and some of my ukes have taken a couple years before they really sang (that includes the laminates, which have proven surprising over the long run, given the common lore about them.) A change of strings can also make a dramatic improvement, either bringing out the best tone or muting less desirable characteristics.
Here's a clip that contrasts the OU7T mango uke with koa and acacia ones (Oscar Schmidt and Kala).
https://www.youtube.com/watch?v=Y_oR9me_1P0
It doesn't provide the best sampling of the tone, but the player's comments may be valuable to you. I think the gloss finish (which tends to be a bit thick on the OSs) may account for some of the volume inhibition.
Note that the OU7 is all-laminate, and probably not mango in all plies (laminates seldom use the same wood for all plies when the outer ply is of a relatively expensive type), so don't expect full mango tone. The Kala being compared is all-solid.
Although this clip is of a Lanikai, it is probably more representative of the laminate mango tone.
https://www.youtube.com/watch?v=ohjmkvCWGkU
