I'm surprised that your manual doesn't have this information, but I'd be shocked if that amp would not drive a four ohm load. That doesn't of course mean that there are no amps that won't do it.
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Well in a sense most all amps can drive a 4 ohm load but if they don't have much current delivery they won't drive it to loud levels and the sound in general can be a bit enemic. Maggies in general like lots of wattage and current. I doubt that your unit would show off either the capabilities of the amp or the speakers. Not something that I would spend my time doing.
I sold a pair of Monitor Audio 4 ohm speakers to a friend who tried to drive them with a consumer grade receiver. When he used the 12 gauge speaker wire I'd included with the speakers everything worked fine but when he moved the speakers further away and tried to connect them with zip cord the receiver would shut down soon after the music started.
My theory was that the combination of the higher current demand of the speakers and the higher resistance of the skinny wire was tripping a protection circuit in a receiver that just couldn't handle the load. I'm sure the problem was that the inexpensive receiver didn't have the current capacity and I doubt that would be a problem with a higher quality amp.
the Audio Aero Integrated selects the impedance of the speakers automatically. This is straigth from the manual:
Connect the supplied power chord to mains plug (1) and then connect it to the mains supply.
Connect the interconnect cables to the RCA plugs at the rear. The sources are identified on the front and are in correspondance with the printing on the rear plate
(2). You can chose LINE 5 as unbalanced (U) and balanced (B) input with the small switch located between the inputs. A tape monitor output is available for recording
(3)Connect the speakers cables to the corresponding binding posts as referenced on the rear plate printing
(4)The impedance is automatically adapted to the speakers.
Hope this helps.
My pea-brained understanding of this matter is that, if your amp has tubes in it (I believe this one does?), that your amp will work harder to produce less wattage when connected to a "difficult" speaker load such as 4 ohms.
Solid state amps, on the other hand, will also have to work harder, but usually can provide more, not less, watts. With only 40 or 50 watts to work with, I think you'll want to find an efficient speaker, 89db or higher, with a simple 1st order crossover that won't slurp all your juice.
Tfkaudio....The tube amp will not work harder. In fact you need to use a lower tap on the transformer output just to have it work equally hard. This is like shifting to a lower gear in a car. You can go up a steeper hill, but you can't go as fast on the flat. The solid stare amp is more like a car with an engine that has a lot of torque, so you don't need to shift gears.