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In Reply to: RE: Correction- the supply voltage is a little higher. posted by Ralph on March 13, 2014 at 11:48:52
Lew and Michael, thank you for your advice.
Ralph, what can I say. You brought everything together.
We now know the 200uF pairs are a minimum. As Ralph said, there are timing constraints.
Lew, I wasn't comfortable adding only one capacitor per phase. The HV caps go off in three directions. I didn't want to open any worm cans. So I installed one 150uF BlackGate per pair. This raised the total per amp from 1,200uF to 2,100uF.
I did one amp first. Plugged everything back in. Let it warm up, and listened. The music sounded a bit smoother. But nothing dramatic. So I went up to the first speaker, put my ear against the mid driver, and liked how clear it was. I went over to the non-updated speaker/amp, and noticed a type of distortion.
The second amp has now been modified, and there is no turning back. Stupendous.
Problem?; now I have to get a riser/skirt manufactured since the BlackGates protrude out the bottom of the amps. OPPS
Final question?; I have a few BlackGates left over. As per your recommendations, the LV 27,000uF caps need a minimum of 1% shunt caps to make a difference. I don't have any of those, so I would like to try the 150uF.
I WILL ASSUME the arrows on the BG's need to point to the -ve screw down's of the main caps.
Bored Billy is not so bored any more.
Follow Ups:
I just installed the BlackGate VK 150uF caps as shunts on the LV (low voltage) 27,000uF caps. These replaced my previous 1.2uF Clarity caps.
Pros; There was an increased sense of dynamic range. Guitar picks jumped from the speakers. There where a lot of things that where an improvement. I will say the placement in 'space' became even more precise. This might imply I like the BG across the big caps.
But.....
I like the performers in the room with me. This is my ultimate goal. I want my brain to believe I am at a concert. The BlackGates failed in this position. It's almost as if I went from a very musical analogue system to a great digital system. For my listening preferences the BG's cannot be in the signal path.
I have only one pair of Mundorf M-CAP MKP 150uf film caps in house. I installed them in only one amp. After firing everything back up, a lot of the magic reappeared.
My present observation; increasing the shunt across the LV is a worthwhile tweak, make sure it is a 'musical' cap. Polarized caps would not be my first choice.
Jumping to conclusions is a common habit of audiophiles who tweak.
Listen for a week or two, THEN make some sort of judgement. If you like the effect of a bypass on the 27,000uF capacitors it is NOT because you have increased the net capacitance. Your bypass cap, even 150uF, is invisible against 27,000uF. (There is no difference between 27,000 and 27,150.) However, 150uF or 30uF or whatever you finally decide to use WILL effect sound quality of the treble and down into the midrange, depending on the value you end up with. And it will have a good effect overall on the quality of the capacitance. Personally, I would say that replacing those huge single electrolytics with a parallel gaggle of the 4700uF/200V Panasonics I recommended (or any similar modern low ESR electrolytics) will be more profound. Probably this is a rare occasion when my personal experience is different from Ralph's; I would say that you don't absolutely "need" 27,000uF per phase in order to realize excellent bass response, unless your speakers have a low impedance (4 ohms or less) in the bass region. (In fairness, my ESLs have a very high impedance at low frequencies, which might have something to do with why my experience differs from Ralph's recommendation. He has to please a wide variety of speaker systems; I don't.)
If you are playing 2 channel stereo, the musicians should not appear in front of the speakers- always behind.
If you think about where the mics had to be to make the recording, you will see why.
that more (or less) capacitance places the performers in a different plane with respect to the speakers. Yes? I never noticed that and never listen specifically for that. To me, that phenomenon is source and program specific.
-If you have phasing problems sometimes that can move the soundstage to be more upfront. Some people like that, but if you think about it, it can't be right. Everything starts with the microphone.
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