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warriorscot
317
May 22, 2018
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So just had one of the monitors casing split open. They just seem to be push fit with no adhesive and unfortunately putting them back together doesn't work as they no longer have a firm fit.
Pretty disappointed as I've babied these since I got them and I really didn't expect such a basic flaw. It doesn't really do much good having a removable cable if the guts of the housing get pulled out before the cable disconnects.
May 22, 2018
Jyri
814
Nuforce
May 23, 2018
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The front and back part of the housing are attached in two ways - clips and glue. This solution can handle a pulling force of 10kg - which is twice what an IEM traditionally is designed to handle. Normal adhesive couldn't go as far as 10kg.
Having said that, of course even the most robust product fails sometimes. I am aware that there are few similar cases - but the failing rate is less than 0.2% if considering everything that Massdrop has sold. If combined all similarly designed IEMs that we've sold, the rate would be less than 0.01%.
Even the 0.01% is higher than we would want and of course something like this is covered by a warranty. Please contact Massdrop or us directly and we will replace the earphones.
My apologies for the trouble and unfortunate experience.
- Jyri/NuForce
May 23, 2018
warriorscot
317
May 23, 2018
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Hey, as an engineer myself(and having done time in failure engineering) relative stats are often pretty meaningless, particularly if the test itself isn't indicative of real world conditions. For example in your design you've colocated the maximum point of stress with the seem of the casing. I know totally why you did this as it makes it much much easier to manufacture. But similarly you are also going to have potentially pretty high loads being transmitted into the housing, especially as the cabled while detachable are pretty stiff, and giving an obvious point of failure. Although pulling force isn't going to be the primary failure mechanism by my take on it, shear would be more diagnostic, but I've only cursarily inspected it.
If your stats are right it's probably not an issue as long as your QC is good enough and cover the small number of defects under warranty. I've contacted support and they've arranged a warranty replacement which is fine with me. But it's worth shouting out any issues in an open forum like this to keep everyone honest!
May 23, 2018
Jyri
814
Nuforce
May 28, 2018
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I fully agree and I truly appreciate the feedback! The transparency and feedback is the reason why I spend time on Massdrop platform answering to our customers. :-)
The reason I wrote my earlier message in a way I did was because you mentioned design flaw - which is not an accurate statement while I do understand what you're saying - and because I wanted to highlight that we do pay attention on this particular matter and the tolerance is higher than on normal IEMs. I do value your comment and tomorrow when I meet with our team I am going to discuss about this and will see if there is something we can do.
So, thank you! And I am here if anything I can do for you.
May 28, 2018
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