Wav files I meant

I bought a Ruizu Bluetooth file player for $20 off of amazon and it seems to do the trick. I simply drag and drop the .wav that I exported. Done a couple new re-mixes and either I have gotten really flood in the 7 years I took off from audio or Sonar is helping out a little. Mixes sound clear, loud and professional. Even on the IPhones/headphones they sound good. I'll blame it on the former.

Firstly in nearfields then decent but not high-end hi-fi headphones connected to the UFX.

Then a small, very very cheap speaker of the kind sold to use as an extension speaker with tablets, ipods etc. Only about a 2" driver, and reduces everything to mono despite having a stereo input.

Apple earbuds on iPad/old iPod (usually after mp3 or iTunes conversion from wave file). iPad built-in speakers. I use the eq functions in the players as well. Normally I just leave them off for listening but it can be eye-opening to find out what happens to anyone's mix if someone's decided to impose a "smile" eq with ramped bass, ramped treble and no mids, or a bass-boosting eq. Not even the best studios and best engineers can produce stuff that the end consumer can't destroy if determined enough, so I don't worry if things go strange with a player's more extreme eq presets because they make everything sound strange.

Hi-fi, which can push out very significant amounts of bass.

TV, which has almost no bass at all.

In the car.

I'm not too concerned that it doesn't sound the same across all systems - because there's no way anything will sound the same in earbuds and floor-standing hi-fi speakers with two 6.5" woofers in each tower. All I'm looking for is that it sounds good enough on all, or at least as good as it can sensibly be made to.

I'll use commercial mixes as reference material through all this.

I'll then burn a few CDs and pass them to a few people who I can generally rely on to be not in the least diplomatic and tell me if it sounds terrible to them, and in what way.

I had a situation where cymbals sounded unpleasantly "spikey" on a TV soundbar,
but were absolutely fine on Yamaha HS8 and Adam A5X.
 
So, interestingly, it's not always the bass that has to be the problem.

Basically I check my audio´s (mp3 and Wave) on 2 different nearfield ´s,
the Nubert Nupro A 200 and the Yamaha HS 80 m.
Often they sound good on the Nuberts and not on the
Yamaha´s´and vice versa,
but when the audio´s sound good on both speakers 
the most is done..
The last refinement I do on some crappy desktop speaker ,
if the songs sound good also on that crap in 99 percent the songs sound also
OK via car speaker etc.
Done....

If I get the mix sounding decent on studio monitors and headphones, I have found it usually isn't necessary to try it out anywhere else. Even so, just to be safe I'll listen to my mixes over bluetooth in my car streaming from my phone. I seldom burn CDs anymore.