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Originally Posted by unl3a5h3d /img/forum/go_quote.gif
Yeah I was looking at the HD414 mods. Which give you less sound leak? The bowls?
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For the record, pads doesn't affect the sound leakage in any way, shape or form. Whether it's comfies, bowls, flats, jumbos or HD414, the sound will leak out where the back of transducer mesh is.
The principle behind this is that as plastic diaphragm (the driver itself) moves, it pushes air at different frequency, generating what we call sound. Here's the catch: air will be pushed from the front, and the back (we call them back wave) of the diaphragm; so more or less the same amount of sound will be generated from both ends of the diaphragm.
Closed back headphones isolates your music from the outside world, good designs will incorporate back wave dampening or reflection, so you won't hear any echoes (but note that sound travels at 340+ meters/second depending on temperature, back wave reflections aren't usually much of a problem for headphones anyways, since there's almost no lag/delay could be heard at such a small distance). Back wave resonance can sometimes cause a congested feel (in my case), but your milage may vary.
Open backed headphones takes "advantage" of this principle and flushes all the back wave sound out the other end, thus creating what we call "leakage". This design creates a much airier and spacious sound because there's zero back wave reflections, but the usual drawback is that it loses some bass energy/impact. If someone were to put their ear next to the open mesh behind the headphone, they will hear the same loudness. The disadvantage of this design is that it provides close to zero isolation, sound from outside the headphone will leak into your music, and your music will leak out for others to hear.
I think, for open backed headphones, the length and density of the cup may affect the sound, which explains why some people report the "woodied" Grado sound better than stock (most people doesn't follow the exact dimension when woodying their Grados) . Other more knowledgeable Head-Fiers can chime in on this (I may be wrong, but hey, scientifically, it makes senses).
As to whether to get the SR80 or SR125, I'd say get the Alessandro MS1. It definitely trumps the SR80 for $10 more, and competes aggressively with the SR125 for $50 less. Probably the best bang-for-buck lower end entry level Grado ever manufactured. But most definitely, if budget allows, get the SR225, it's got better treble and bass extension from better matched tolerance, more open metallic mesh (versus the plastic mesh on the SR125) for a more open sound, and definitely less shrilling/ear piercing compared to the SR325 (but the SR325 have leather headband (more comfy) and aluminum cups (possibly better dampening compared to plastic)! Grado's evil..).
Of course, you can buy the SR125 or MS1 and start modifying the headphone. If the headphones are properly kept and taken care of, you can even remove the cup and mesh for an ultimate open backed sound!