Originally Posted by johnplayerson
There are lots of pictures of the marathon already available on the internet. It is not my plan to be a service , only trying to save some people some money and get them a better amp. I got them both here.
If you want to argue with electrical engineer randy slone about capacitance and capacitors, as well as amplifier power supply rejection ratio, unfortunaty he is deceased. With good amplifier design only, high grade capacitors only remove noise that would otherwise be rejected by the amplifier boards. They only need to be wired to handle the highest voltage given out by the transformer leads. You can make them wired to 1000 volt, still only the transformer rating will pass threw them.
Capacitance determines the ability of the capacitors to smooth properly at all levels of voltage. MR Slone recommends 10000 uf minimum per 100 watts, and that is his minimum recommendation.
The marathon amplifier is only 60 lbs. where does common sense tell you the extra 25 lbs is? That is a lot of weight. I can tell you right now most of the difference is in the transformer, which always is the heaviest part of amplification. The caps don't weight anything. I would guess 5 lbs in the case.
60000 uf per side in the marathon is half what randy sloan recommends and is inadequate to smooth the flow to full power. If you want to question it go ahead, but most audiophiles want more capacitance.
Again, you're saying a whole lot of nothing.
I want to argue with you because it's you who is posting wrong information. It's obvious that you never planned to be of any service to the community, it's the disservice part I object to.
No one said anything about "voltage passing threw (sic) them", which is irrelevant. We discussed capacitor reservoir energy storage, and posted the formula to calculate it.
I have an amp with 80000 uf in its cap bank. I have another amp with 33000 uf in its cap bank. Which amp has more energy storage in its cap bank?
Of course, you can't answer that question without knowing the voltage spec of the caps.
The first amp has 8 @ 10,000 uf 100V caps. The 2nd amp, 10 @ 3,300 200V caps. The 1st amp has a cap res storage capacity of 400 joules, the 2nd amp, 600 joules.
For the math-challenged or lazy, here's a capacitor energy storage calculator:
I'm posting this ^^^ info for others who may be interested because it's obvious to me that you are not. If you believe microfarads/100W are all that matters, voltage is irrelevant and all you have to do to qualify that errant belief is to say "as long as the amp is designed good.." then good for you, but I wouldn't post that philosophy all over a thread on the subject and not expect a response or two.
Xfrmr weight vs actual performance is another whole thread. I suggest you read a bit more before you tell us all how it works.
My point is that I showed that the MA 5050 can handle most soundtrack to below 10 Hz, save a few very heavy hitters, at calibrated reference level in 3500 cubes. If any amplifier "tests out way better", show us the evidence. This is what we generally do here. notnyt did so with his systems and documented the progress with measurements and specifics, which is why people use his recommendations with confidence. We both documented the MA 5050 MKI (which, at the time I paid $650 for) and MKII and then moved on to the clone FP9000, K12000 and FP14000 amplifiers, again providing a service in making all information we discovered available.