Pass Labs ALEPH 5 vs ALEPH 2

my 5 has never shut down, never heard of an aleph that did!

At the time, I was living in an area where temperatures easily exceeded 100 degrees. I was driving Quad electrostatics on a very hot day and sitting far back in a large room. I was playing very loud and very dynamic jazz that had been recorded live. I think the combination was just too much. The Alsph 5 heat sensor, I believe, turned it off for awhile.

Otherwise, I have never had a single interruption, let alone failure, of any kind with Pass stuff. The best designed, best built electronics in the business, IMHO.
JT

I used to have Aleph 0 (75 WPC, 3 gain stages). Now, I own both Aleph 2 and X-600. They are all excellent power amps.

Some facts:
Aleph 0: 75WPC, mono blocks, 3 gain stages.
Alpeh 5: 60WPC, stereo
Aleph 2: 100WPC, mono blocks, power consumption 300 watts for each (600 total). One transformer for each.
Aleph 4: 100WPC, stereo, power consumption 500 watts. One bigger transformer (I believe) for both channels.

Not sure why Pass Labs will release Aleph 4 after Aleph 2, since they are both 100 WPC, the same design and same grade of parts and I don't know which model is better. Maybe just to reduce some cost without sacrificing the sonic performance for marketing purpose.

Thanks for all of the responses, I apologize for the confusion I caused, I originally meant to seek a comparison between the ALEPH 4 at 100 watts and ALEPH 2 also at 100 watts as Jshaw1004 alludes too. I am still not sure if I appredciate the difference.

Each outputs 100w into 8 ohm but 200w into 4 ohm for aleph 2 only. I believe aleph 2's have higher bias current and damping factor because separate transformer and separate enclosure for better heat dissipation.