I was relatively happy with the sound of my srh940. However, the band of my srh940 started to crack seriously, and with all the scotch and glue to maintain the band, it was just an ugly mess. So the srh1540 with a superior design, was a natural choice to replace my srh940.
Physical description:
Here are some pics, to compare with to my (old damaged) srh940. The box height of sr1540 is significantly bigger.



Sound quality:
They sound fine with most musics. No "wow" factor, I didn't find them superior with a particular genre. However no "glaring flaw". The bass is a bit emphasized, but I get used to it after some listening. The sound signature is relaxing, non-fatiguing, but I don't get bored either. In comparison, the srh940 sound more "exciting" , with a more present treble. The shr940 sounds more "alive", and I thought it work well with metal , or industrial music.
Is the sound of the srh1540, that much different of the srh940 ?
Yes and no. I thought that beside their different frequency balance, there was some similarity.
Actually, I tried to put the srh940 pads on the srh1540. And I was much more familiar to that sound. It sounded just like my modded srh940. Because I've put some rope to increase the thickness of the srh940 pads (see my
previous review). The thicker are the pads, the more the treble is tamed, and the more the bass is present. So I think, if the srh1540 default pads were a bit less thick, the sound would have been more pleasant.
Would I replace the srh1540 pads, with the srh940 pads ?
Nope, because with the srh1540 pads, I get significantly better comfort & isolation. And after all, the srh1540 sound, with stock pads, is good enough. Even if I miss a bit some "excitement".
So is the difference in sound between srh1540 and srh940, just a matter of distance between ears and drivers ? (or different pads) .
Not completely. I thought the srh1540 got a cleaner sound. So, there's an improvement somehow, even if it's not striking.
Comfort:
Much, much better, than the srh940. Clearly among the best. The most comfy headphones I know, are still the hd595 though. The srh1540 are incredibly lightweight, they just weight nothing !
The alcantara for the pads, makes a difference. I thought the velour pads were comfy, but not that much when you compare with alcantara.
The isolation of the srh1540 is better than for my srh940. Almost as good as HD 25-1 II , but this time with true comfort.
Cables : not too happy with the way you connect them. You can detach them accidentally. I put the cable around behind my neck to prevent this. In the manual they warn that "the cable connection is not designed for everyday use". In other words, it's a bad idea to attach/ detach too frequently the cable. Otherwise, I find the cable too long for my needs (listening music most of the time from my computer). And I miss a coiled version of the cable.
Conclusion:
If it wasn't just to replace my srh940, I'd say that the srh1540 are a good buy. I hope they are more durable. So far, I'm satisfied. I don't feel the need to spend more time (and money) at collecting other headphones. If I didn't need isolation, I would use my hd800 instead, but otherwise the srh1540 are enough enjoyable for me.