^^^Mojo... I just assumed that the earphone/headphone jack in question already had a 90 degree bend on it, since that's normally the ones I see & use.
Based on my prior experience with audio component connections & depending on the angle which the force is coming from, straight vs. right angled jack plugs are a horse a piece thing when it comes to strain relief...imo There's pros & cons to both designs depending on the application.
I understand that the goal is to keep the headphone jack end as close as possible to the units base & delicate audio jack port, so it's less likely to get bumped into. If the cord is yanked/pulled hard from towards the top, a straight connection will pull out with much less resistance than one with a right angle on it. This is due to the location of the cord in relation to the plug itself, along with the direction of force that's being applied to it. Although when being pulled hard directly from the side, either type of plug jack can cause some damage to the audio port.
I've found that it normally causes less damage on a pulled/detached straight vs. right angled jack plug. However, if the jack connection is being bent or pushed down hard with pressure from the top or side, damage is being done inside the audio port by either plug regardless, but it would probably be less damaging with a 90 degree plug. Just based on it's lower profile design.
Let's just say that I would prefer to have a 90 degree headphone jack plugged into my ipod if it's located in my back pocket or backpack & a straight jack plug if I'm connected to my home stereo system. It just all depends... While metal detecting I've found that a right angle plug is more forgiving when being bumped, but this is not the case if it's accidentally pulled on/out.
It would be cool to have a swiveled flexible jack end connection vs. the rigid ones we have now. One which could create a more flexible & forgiving strain relief for all types of scenarios. A safety quick disconnect at a certain tension would be amazing as well. Because not everyone likes the sound of wireless & some of these wired headphones have very short/user unfriendly cords on them. As we already know, good headphones & connections are a definite "must have" when detecting.
Bottom line...nothing is 100% foolproof, either way you have to be very careful with theses fragile audio connections.
Hopefully this helped, that is if it didn't already put you to sleep.
