Ensure that the cable is plugged in completely. Loose connection will cause loss in bass.
Has a hum when plugged into a Samsung Note 4 that cannot be heard on other headphones
Make sure the phone is not being charged. Change to a different phone/player to verify headphone functionality.
Did not fit any better than other earbuds I own
3 pairs of ear plugs included in the package of 3 different sizes. Try a different size of eartips to test the fit. Eartips that do not fit will also result in loss of bass due to lack of proper enclosure.