Is Airy sound and tight bass paradoxical?
Just a simple question to those who know.
One thing that I enjoy is a tight bass, if this means that the bass is smooth, with a nice soft "tsss" hiss but without the bass being shallow or thin, it needs to be deep. Treble, which makes it all sound smooth. And distinctive/well defined/separated mids and a forward, unmuffled/muted, clear, voice.
Is my beginners understanding accurate and is this combo possible?
They're not paradoxical and you can still have both. Tight bass just means a smooth bass response curve that goes down deep into the bass and the amp doesn't distort nor clip driving that transducer; similarly, airy treble just means you have an extended but smooth treble response.
With headphones specifically however you have to consider one problem: these are single driver designs. Therefore you would need the driver to deliver a flat 20hz to 20,000hz, which isn't a reality just yet, as engineers juggle a balance between:
1. Wide response
2. A flat or at least smooth response curve
3. Sensitivity
4. Diaphragm needs to be light but tough
5. Size and weight
6. Cost
If anything, what can make it a choice between both (though not necessarily paradoxical) is how engineers choose a compromise based on the above criteria. Diaphragm size can also affect how deep the bass is (ie more surface area on larger drivers) or how smooth the treble is (smaller surface area, particularly on dynamic drivers, helps smoother response on high frequencies). This is a lot less of a problem on speakers when you can design one that uses different drivers designed for different frequency ranges, for example something like the Sonus Faber Stradivari Homage has two 10in woofers, one midwoofer, one midrange, and one tweeter on each cabinet; ditto the Aurum Cantus Grand Supreme which uses two 10in woofers, two 5in midrange drivers, and one ribbon tweeter for smoother treble response. You don't have these in headphones since cramming several drivers into an earcup can create more problems than they solve (at least until someone figures out that a concentric coax might be worth exploring), for one, you'll just end up with several smaller drivers that might have time alignment issues (unlike funneling the sound of several drivers into a bore as in IEMs), so they go for larger drivers like the 70mm in the HD800. Treble doesn't roll off, but then you end up with a treble peak that the HD650 and HD600 don't have.