I guess it's possible they could "design in Canada", then get all the parts from ATI and "manufacture" in Canada.
The internal layout does look similar, but the same could probably be said for most 5 channel 200 W amplifier with similar enclosure size, that are class AB. Given the comparable dimensions, using two toroidal transformers, you don't really have much options in the physical layout.
Below is a quick comparison of the two 5 channel amp
Dimensions:
Anthem: 6.625"X17.25"X18.125", 61 lbs
Monolith: 7"X17"X16.5", 78.2 lbs
Amp specs:
Both class AB design.
Anthem......................................................................................Monolith
Output - 225 W/400 W, 20-20,000 Hz, <1% THD.....................200 W/300 W, 20-20,000 Hz, 0.03% THD
V gain - 29 dB............................................................................28 dB
Slew Rate - 30 V/us.................................................................. >50V/us
DF, 20-1000 Hz - 300.................................................................10 - 100 kHz - >400
Channel sep - >65 dB.................................................................20 - 20,000 kHz - >100 dB
SNR - 120 dB A weighting....................................................... >120 dB
Power consumption - 1200 W ("high output").........................na
Power supply
Transformer VA rating: na........................................................1230+1,025 = 2,255 VA total
Storage/filter capacitors size: 16,400 uF per channel........... 22,400 uF per channel
I did the
@KEW (if he has free time I hope he will check my findings) thing, that is, compared the sizes of their transformers by scaling the photos.
The Monolith transformers are physically larger, approx. 17-20 % in volume. That does not mean the VA ratings are proportionally different, though I bet the Monolith 200X5 does have higher VA ratings.
The Monolith definitely has 36.6% more capacitance per channel. The Monolith is 17.1 lbs heavier, likely due to the larger transformers.
I highly doubt the MCA 525 is made by ATI, the design would be naturally similar though. Class AB power amps are not rocket science.