The DM-50D-BT has three types of analog audio inputs (including balanced connectors) on the back, as well as a volume/power knob and a headphone jack on the front. This system has Bluetooth ...

First, the obvious: A 3.5mm headphone jack and the necessary circuitry take space inside a phone -- space which could be used for other things like a bigger speaker. The circuitry could also cause ...

[mauriziomiscio.mm] has a way of dealing with the problem in a once-and-done fashion, by installing a female audio jack into his vintage headphones. The benefit is that if the cable is damaged ...