I've always found linguistics and accents to be an interesting field of study, particularly in relation to what it tells us about the speaker and society at large. I read an interesting piece in a blog called 'dialect blog':
In relation to the variation in accent in Dublin:Dialect Blog was launched in 2011 as a place for hobbyists, actors, linguists and curiosity-seekers to learn about and discuss the dialects of the English language.
Dublin: A Tale of Two Accents | Dialect Blog
The author compares a 'suburban' accent in Drumcondra's Aiden Gillen to Damian Dempsey's accent. The author comes to the following conclusion(s):
So, what do the posters of P.ie think? Is the wide variation of accent in Dublin indicative of social inequality/isolation? Or do you even accept the author's premise? I'm not sure the variation is any wider than say RP in London and what is heard on Eastenders.It’s a world of difference. Suddenly we’re talking about an accent as inscrutable to outsiders as Glaswegian. Dempsey speaks with a “cramped” vowel system that is so unusual it’s hard to even analyze. Notice the pronunciation of “wiser” as IPA [wəizə] (sounds a bit like “woyzer”). This is a major dividing line between the working- and middle-class accents. This dialect is so different from Gillen’s that they might as well be on opposite sides of the world. And yet both are Dubliners.
So what is going on here? Well, according to Raymond Hickey, something of an expert in the field of Irish dialect study, Dublin is heir to two distinct linguistic traditions. The first is the Working-Class Dublin accent, which harks back to the earliest days of modern English. The other tradition is that of the Anglo-Irish aristocracy which emerged in the city in the 18th and 19th Centuries. One dialect was largely preserved up to the present day; the other morphed into the “suburban” dialect we hear among most middle-class Dubliners.
I am not versed enough in the history of the city to offer any commentary on why Dublin remains so divided in terms of dialect. I am a bit suspicious, however, when people of different backgrounds speak with wildly different accents in the same city. It’s an indicator of an educational and societal chasm that has not being bridged.
The Author has a blog post on supraregional Hiberno-English:
Supraregional Irish English | Dialect Blog
Which is relatively interesting - perhaps Gillen's accent fits better into such a 'prestige' accent category?