My XPA-3 was bought Dec-2012, what Gen is that?
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Not Canada, but I am in the UK and I have imported 4 Emo amps. Even allowing for carriage and sales tax, they still give me better value than anything I can buy in the UK. So, most definitely worth it from my POV. I guess the question is: what else can you buy in Canada that gives you similar performance, and what does it cost?
No really. If you only need three amps, get the XPA-3 and save yourself some $$$.
What I definitely would not do, for a movie system, is use a lesser-capable amp on the centre channel. The centre channel carries as much as 80% of the content of a movie soundtrack - if I was going to amp that channel differently to the R & L (and I see no good reason to do so), I would be considering putting my best amp on the CC.
Not easy to know. The only time additional power is worthwhile is if the existing power is not enough ;) By that, I mean that if a system is running into audible distortion/clipping because the amps are being asked to deliver more than they are capable of, then additional power is needed. But if that system never runs into clipping at the SPLs the user requires, with the speakers etc that the user has, then additional power won't make a jot of difference to anything. Watts left on the table are still watts left on the table. Personally, I try to aim for the amount of clean power that I need to drive my speakers to movie Reference level, plus ideally 3Db of headroom on top 'just in case'. But that last 3dB of headroom can be expensive and, hopefully, it won't actually be used, which kinda makes it a waste of money IYSWIM. It's always worth remembering that for most of the time, most systems are playing happily with just a few watts - like less than 10!
Have a look at one of the many SPL calculators on the net. Feed in your speaker date etc and it will give you the power you need to hit a specified SPL. My speakers, for example, are 89dB/1w/1m sensitivity so they will play pretty loud, at 1m distance, with just 1 watt of input. That's over 100dB for about 10 watts! Allowing for SPL diminishing as listening distance increases to my usual 9ft or so, you can still see that 50 watts is going to drive these speakers louder than I will ever need. Without knowing the manufacturer's sensitivity spec for your speakers, it's not possible to go any further but you will have the data in the speaker manual so it is easy to use one of the calculators to do a similar exercise.
One caution: my room is heavily treated and treatments absorb energy from the room - about 3dB in my case, so if your room is treated remember to factor that in.
Right off the bat then you need double the amp power I need (for that extra 3dB of inefficiency). The size of the space isn't nearly as relevant as the distance you sit from the speakers. You’re not rying to fill the whole space with sound - just the bit between the speakers and your ears.
I would say that would be a very good way to proceed. You will be getting a very fine AVR and the best flavour of Audyssey. Plus some serious amps. If you still feel it is not enough, then you can stick an XPA-3 in there and use the 4520's amps for the other channels.