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Post by krisno on May 12, 2009 16:09:57 GMT
Hi
Anyone tried a film output cap in the V3 instead of electrolytics?
1) Which film output cap would be best suited?
2) If electrolytic's is the only way, which is the best? Blackgate Nx?
I haven't seen a film cap which is larger than 47uf. Is that enough? The eletrolytics that comes in PF mod kit is 470uf.
K
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leo
Been here a while! 
Team wtf is it?
Posts: 3,638
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Post by leo on May 12, 2009 16:29:02 GMT
47uf is too low so a film cap only is not going to be suitable
You could maybe try bypassing the 470uf with a smaller value film cap,Mikes already mentioned this before.
There should be pictures somewhere if you search
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Post by PinkFloyd on May 12, 2009 18:08:48 GMT
Hi Anyone tried a film output cap in the V3 instead of electrolytics? 1) Which film output cap would be best suited? 2) If electrolytic's is the only way, which is the best? Blackgate Nx? I haven't seen a film cap which is larger than 47uf. Is that enough? The eletrolytics that comes in PF mod kit is 470uf. K The NON POLAR electrolytics that come in my V3 kit are "1000uF". A 47uF film cap would be the size of a small house. You "could" fit something like a 1uF in parallel with the 1000uF Non polar but you will then be adding another cap into the signal path.... I have experimented in this area and feel the 1000uF is best left alone. |
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Post by krisno on May 12, 2009 21:46:22 GMT
Are your output caps 1000uf? my god... doesn't that make it 'slower' ?
Did you try Blackgate N as output caps?
K
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Post by buelligan on Jun 20, 2009 0:50:23 GMT
Hey Krisno,
I tried two Blackgate NX 680uF per channel (one laying down flat against the main PCB, the other vertical) bypassed with a 2 uF Auricap (again per channel) and after an eternal break-in (at least 3 weeks 24 hrs a day) got results that I thought were very impressive. I also replaced the input cap with a straight wire link, since my X-CAN v3 is fed from an X-10 with output caps, so no DC.
First of all, the higher value cap ( 440uF stock to 1360uF modded) will extend the low-bass rolloff down to much lower frequencies. Remember that the output caps are in series. Any slowness would be due to a low quality cap. This might not be an issue with higher impedance phones like Sennheisers (around 300 Ohms), but they made a big difference with my AKG K701s (60 Ohms.) Grados (30 Ohms) would likely benefit even more.
The bass and dynamics you would expect from larger capacitance was only the beginning of the differences I heard. Resolution of instrumental textures, and spatial cues were noticeably better as well.
The Black Gates are obscenely expensive, and stocks are likely to dwindle, but I don't regret the mod. In fact, I went ahead and replaced the output coupling caps from my X-DAC v3 and X-10 v3 with the BG NX 680uF/Auricap 2uF pairs, and although it was expensive, I'm glad I did it.
Happy listening everyone,
Buelligan
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Post by PinkFloyd on Jun 20, 2009 12:36:48 GMT
Yes....... higher value output caps help low impedance 'phones..... have a look at this convertor www.sengpielaudio.com/calculator-RCpad.htm In the resistance field add the impedance of your headphones and in the capacitor field add the value of your output capacitor...... Stock 440uF = 11.3Hz with 32ohm 'phones.... it goes down to 4.9Hz with 1000uF caps 440uF is fine for 300ohm 'phones with a Cutoff frequency of 1.2Hz (0.53Hz with 1000uF) So....... 1000uF is a good "catchall" value and suits low as well as high Z 'phones. |
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