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A lot does depend on whether you want an Oasis-style acoustic sound (aka Taylor sound). The AER excels at this - very open, airy, silvery sound. The Marshall is altogether fatter and warmer and suits the large body Lowden character well, and it is also a bit kinder to vocals (the AER, if used for vocals, is pretty edgy).
I don't know why Marshall chose to enclose the AS50R. My experience is that open back combos (or open-back speakers, especially if over 8 inches driver) sound more natural for acoustic guitar. I have considered opening up the AS50R back as I reckon this would totally change its bass dominated response.
I've used loads of different amps and speakers over the years and conclude that deep, small speaker, bass ported, enclosed cabs are not very good at reproducing a natural listening experience; shallow, open back, unported cabs sound more like an unplugged acoustic. There are exceptions and those all seem to be very carefully designed like the small Trace Elliotts were, like the AER, like BOSE, or like the Ashworth. Every time I've fallen in love with a really expensive acoustic guitar amp of a portable size (I like to walk to my regular session) it turns out to be a real bummer for vocals, or not even to have a second channel, or to have no built-in reverb, or no control over how the reverb is used on twin channels.
Apart from the Marshall, two small combo acoustic amps which I've found to be very natural sound are the very cheap Tanglewood (etc!) AX-30 which is not powerful, has a violent spring line reverb of limited use, but has the BEST passive piezo input (as well as active) - and for £99 is hard to beat; and my secret weapon, the Nobels Streetman 10/15, which is amazing open back design battery powered twin channel amp even incorporating a A=440 tuning signal, CD input, ext speaker output, power outlet for 9v stomp boxes, three-band EQ, shoulder strap, mic stand mount, 9 to 12v compatible AC adaptor socket... and I think mine cost all of £69. It is the most natural small amp I've ever used, no reverb or fancy stuff, but amazingly able to take max vol and max gain without distortion (and to drive a 12 inch PA cab without blowing up).
I played 30 mins of instrumentals to a hundred or two folk sitting in the town square in Kelso (the largest market square in Scotland) on Saturday using just the Streetman and my Tacoma Papoose. I sat and played while they dismantled the 200W PA which had been running for the keyboard/songs guy, and set up tables and chairs on the stage for the next (town civic week) event. I don't think volume was an issue because the occasional end-of-piece applause was coming from all parts of the square, and from stone deaf old folk who had been wheeled out (captive audience!). My Fender ampCan can't do that without distorting horribly or rattling away on bass notes - the Streetman did it fine.
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