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That's 480 hours and basically $ 0.20/hour. Everything that is going into space or is going to monitor this will have to undergo burn-in. This is to find early failures of components. And this works like a charm. Less chance of components (assembled components) to fail during a mission. Even...

It probably does to the one making the statement. Doesn't mean anything electrically in the device actually changed over that mentioned 300 hrs.

The driver assemblies for DT700 and DT900 are the same. Also TYGR and 32Ohm DT990 are the same. DT770/880/990 assemblies differ. To determine if the actual driver is the same one would either need to test or know the BOM list of the assembly and see if the part numbers of the drivers in these...

Still very possible if the front and rear damping (and or porting) differs. That will make a different correction needed and there can be different resonances/nulls/Q factors because of acoustical differences. So even if FR would be exactly the same (on a single fixture with same positioning)...

When he would have exchanged the drivers (so not the damping) and would have shown on his EARS that the headphones measure the same (within tolerances) then he has proven that the drivers are the same. It is possible they are because of the substantial difference in performance could be damping...

There are mostly differences in front and rear damping as well as pads. It would have been nice if he exchanged the actual drivers only from the baffles (and the front and rear damping in place) and shown that the drivers are actually the same as well. They could be but he did not prove it. He...

The drivers are not the same, just like drivers among the AKG 7** series and HD6** and HD5** series are not the same. They just look the same because they are built on the same chassis so are quite similar but not the same. Different part numbers as well. DT880 and DT990 share the same...

No it didn't. He took delivery after his test was done (involving kids to swap wires and using a regular switch which is not needed with the ABX box at all and switching can be instant) And blind AB (actually XX) as one has to determine which amp was under A and which one under B at different...

I do this in all my reviews (except the earliest ones) but seem to be one of the few that report this important aspect as well as clamping force in some of them.

Resistance, capacitance (cable also adds capacitance), overload character, gain and RIAA compliance and when present LF filter are all important aspects. Resistance and capacitance as well as the cartridge and even the tone arm influence the final frequency response the most. The peaking is...

I do not disagree with that point but that does not mean the headphone has to sound as terrible as it measured. I mean: This suggests good deep bass (well extended) with some 'punch' (100Hz-300Hz elevated a bit), good clarity (1kHz to 6kHz following the curve on average, and some extra treble...

That still doesn't mean it will sound poor. Elevated bass, recessed mids and elevated treble is liked by a lot of people. It also depends on the music one has at hand. It varies. Sometimes I listen first and measure later. Sometimes I measure first and listen later. In the end it always comes...

The question is how do you know the 3.5mm TRRS is balanced and since there is no 'standard' for that what L+, L-, R+ and R- are connected to on the 3.5mm TRRS jack how would one know what converter to use ?

For 3.5mm TRS vs TRRS it doesn't. The headphone may not sound as it should and or the mic/remote may not work well or at all. Using a 3.5mm TRS plug to 2.5mm TRRS plug converter is likely to short the 2.5mm TRRS source's amp. When properly designed nothing will be destroyed but not all gear is...

That 3rd ring is for a mic/remote function (in the cable). 3.5mm TRRS are usually not used for balanced connections. Of course there may be a manufacturer (mis)using it this way. Note that there are basically 2 variants in TRRS wiring. OMTP standard: Tip = Left Ring = Right Ring 2 =...

I think Amir means: A headphone may not be perfectly truthful but still sound pleasant and seductive. Certainly at first glance. I tested and measured a Yamaha HPH-MT7 just yesterday and on first listen it sounded 'impressive' with punchy bass and 'highlighted' details. When listened to more...

2 pronged devices are double isolated so can safely be used on 3-prong and 2 prong mains sockets. The fact that small leakage currents can cause hum problems is not a safety concern (when leakage currents do not exceed dangerous levels) A 3 prong plug devices may not be safe to used in a 2...

15dB difference between 150Hz and 500Hz is ... well... substantial and is quite indicative of having a 'sound signature' that deviates from 'neutral'. 10dB on Techpowerup plots it seems but this too is a bit too much to be called accurate. :) Great looks though. Small cups (and room for the...

Yep safety, groundloops, mixed (prong) systems, SE interlinks and 'hum issues' sometimes, when not done correctly, can bite each other. Fortunately there can be solutions that maintain safety regulations yet can break ground loops. These just aren't easily recognized when one is not versed in...

Well... the 'never' part is a bit exaggerated. In fact almost all audio systems might well have a mix of 2 and 3 prong devices that should be connected to a 3-prong power socket but is for safety reasons, not 'unwanted hum' reasons. However, I think that's not what he meant with the rule. When...