For those of us who love listening to music all the time, the JBL Charge 4 is just what the doctor ordered, especially now that it’s available for just shy of $110, a heavy discount from its usual $150. The JBL Charge 4 is not a tiny speaker that you can barely hear when you take it out into the yard. No, it’s a sizable speaker with a bass strong enough that it can rattle your teeth in the best way possible. This is a wireless Bluetooth speaker, which means you can connect it to phones and tablets and laptops alike. Even better, it can connect to two devices at once, making it easy to jump fro…