Yes, although i am not sure how to explain exactly why. From what i have read it is a limitation of the power supply which is under more stress when two channels are bridged.
To put it simply a bridged 4ohm load will be hotter, have increased harmonic distortion and be more inclined to clip than two 2ohm channels
I think if this is the case, something is not correlating, a non apples to apples configuration is used to manifest this.
2 ohm stereo and 4 ohm bridged is the same thing as far as the
amplifier is concerned. I've never seen a case where bridged mode caused more problems if you used it properly.
Distortion can be double because you are combining channels
but you also get 2x more power and distortion is all relative,
you can still be in the inaudible range in spite that it's higher.
Is this Chuck's test? if so;https://www.avsforum.com/avs-vb/showt...=855865&page=3
EP2500 2 ohm stereo power is 1094w/ch @ 2.34 ohms @1khz with
EP2500 4 ohm bridged is 1957w @ 4.4 ohms @ 1khz with 0.046% distortion.
1. 2.34 ohm per channel load is the same as a 4.68 ohm bridge load. The bridge mode test is not exactly identical.
2. 4.4 ohm load is lower than a 4.68 ohm load and results will be a
little different. Power output in bridged mode is almost 2x, but
the bridge mode distortion is less than stereo mode. I would
expect the amp to generate about the same amount of heat.