My htc desire 626's can us its bottom speaker but its really low.

[TheJ Plane]

My phone the HTC desire 626 doesn't work when it comes to my bottom speaker. I have tried speaker boosters sound boosters multiple volume boosters and I cannot hear anything from the phone. The sound does work but you have to be very very close to the phone to hear it . I've turned it to full volume and I cannot hear the phone unless I have ear phones.I can't use speaker mode I can only use the earphones while using the phone on call or when it's up to my ear but I cannot watch YouTube or use Vine or watch videos on Instagram. It is very annoying not being able to do anything please help.