Why do our senses evoke different subjective experiences I'm wondering why there are different subjective experiences when our sensor systems are technically the same neurons that just get excited by different stuff (photons, soundwaves, ...). 

So why does it feel different to hear something than to see something when both are just electrical impulses?

I'm of course aware of the concept of qualia ("redness" etc.), but I haven't found this question being discussed in relation to that. 

Edit:

Of course I'm not claiming that the most outer part of the sensor systems work in the same way. However all of them produce (or their function results in) electrical frequencies. I highly doubt that if you'd input the frequencies produced by a retina to the neurons of an auditory system, this would result in vision.

From what I understand and know, all sensory systems output electrical signals. Apart from differing frequencies I would say they(the signals) are the same. At the same time, I doubt that it's just the frequency spectrum in an electrical system that makes a signal "vision" or "sound" to our subjective experience.
Don't know the answer (I think no one does), but you should have a look at this paper: A sensorimotor account of vision and visual consciousness. O'Regan JK, Noë A., BBS 2001 PUBMED

In short the proposed answer is that modalities are subject to different sensory-motor contingencies. For example, when you move forward the visual input undergoes very structured changes, but auditory input undergoes a different set of changes. So what makes seeing feel different than hearing is that the relationships between motor output and sensory input are different.

You might also be interested in sensory substitution experiments. The brain is to some extend able to acquire new 'senses', when specifically structured information is provided to an existing sense. For example, it appears to be possible to 'see' (whatever this means in this context) when brightness information is transduced to touch or electrical stimulation of the tongue Wikipedia