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Sound pressure level and sound quality are two entirely different things
Quite. However the point still stands.
I'm prepared to bet that if I applied a low pass filter which modeled the roll off characteristics of the AudioEngine A5 moofer to the OP's Dad's system and sat him in the sweet spot of both then there wouldn't be a lot of difference in terms of perceived audio quality. He might even prefer the A5s.
What makes the difference is the balance and weight from the bass which adds gravitas to the music. It's always going to be a bigger sound than what you will get from a bookshelf or desktop sized enclosure. No matter how loud you play or how much you pay.
That's why the OP's (& I suspect that of many other audiophiles atm) central dilemna is less about which particular brands to buy but a choice between a traditional full range floorstander system or a combination of mini monitors and a sub woofer.
Nowadays it is relatively easy and inexpensive to beat the pants off his Dad's old system in every department except the crucial bottom two octaves and he will never do that convincingly without a relatively large driver and a powerful amplifier somewhere in his system.
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I will be going with the Onix Ref 1 MKII speakers paired with an Musical Fidelity A3 passed through a Audio-GD DAC13 MKIII.
Now this should, in theory, be equally if not better than my dads system.
Whats your take Ron?
I'm not personally familiar with any of the components but, like I say above, I strongly suspect you will prefer that to your Dad's except in the bottom end.
If you listen to classical or acoustic/folk music a lot or prefer low listening levels then that might not bother you much and if so best of luck. Otherwise I'd look for a way of dividing your budget up differently so you could afford a sub or larger loudspeakers.
I think you are proportionally overspending on your choice of DAC anyway. I'm loath to criticise a company who's products I am unfamilar with but there is something not quite right about a company that offers DACs in a selection of ranges based on 'flavours' or audio colouration introduced. All DACs should be transparent not 'Musical' or 'Warm' or 'Neutral'. After all, once audio is in the digital domain it is a trivial matter to manipulate it in any manner you wish anyway. Why buy a DAC with a designed in 'flavour' you can never change?