when my mums out of the house, i use my Sony GTK-N1BT. this is heavy duty, loud af stuff. amazingly loud, but too bass heavy which disrupts everyone, so only when shes out.
my other speaker is the anker A3143. i also use this when shes out and i wanna hear the music, its my primary speaker. its really powerful and the quality is amazing. battery lasts a very long time too - i would absolutely recommend this speaker to anyone