Caiman passive output mod revealed

[Usernametaken]

On the other hand, 10uF bipolar Nichicon MUSE electrolytics sounded pretty good when I tried them.

10uf/25V?

[MartinT]

Plenty!

[Usernametaken]

Plenty!

Thank you guys, very much.
Does the voltage of the caps matter so much, and is 2.2uf - 10uf a good range to look at?
Already have a set of Nichicon on the way but now I'm looking at other caps.
If it's a simple swap and change until I get the sound I'm after, I might just grab some other bits and pieces to test.
I can see this quickly becoming a slippery slope...

[MartinT]

No, voltage in this kind of coupling application is only at most the initial voltage differential when connecting up (say, the voltage rail at 16V) and quickly becomes tiny.

[Usernametaken]

Plenty!

Well....
I now have some Nichicon Muse FGs in 10V and some Elna Cerafines in 16V on the way to have a play with as well.
All 47uF as I honestly don't want to go playing with the capacitance until I know why it's a specific number and what changing it does

[MartinT]

As I remember, the Nichicon MUSE sounded best but Rubicons were also good. I never tried Elna Cerafine bipolars but if you look at my photo you will see that I replaced all the polar electrolytics with Elna Cerafine II caps and this made quite a difference to sound quality for a small outlay.

[NRG]

Well....
I now have some Nichicon Muse FGs in 10V and some Elna Cerafines in 16V on the way to have a play with as well.
All 47uF as I honestly don't want to go playing with the capacitance until I know why it's a specific number and what changing it does

The capacitor forms a high pass filter with the input impedance of the following amp stage. go too small and the roll off may affect bass subjectively, 47uF is more than enough!

http://www.ekswai.com/en_highpass.htm

[Usernametaken]

So I stole some 47uF caps from the opamp board because I just couldn't wait.
I'm new to audio lingo so please bear with me.
I'm noticing some sibilance in certain vocals and also female vocals appear a bit dull or lacklustre. I'm also getting some pops when switching between tracks, but this could be my source. It's also a lot brighter than before.
What I have noticed is that the instruments seem a lot more separated and defined, I guess this is what is referred to as sound stage.
The bass is also a lot more defined but seems to be lacking the depth that it was before, I'm unsure if this is actually due to less bass or due to it being a lot brighter.
I'm looking forward to my other caps arriving, I do like how it sounds bar a few small issues.
I take it I'm not the first person to run kit with the case removed.

[Usernametaken]

I'm also finding the vocals slightly lacking a presence, not sure if this is just the caps or I'm listening for things that don't please me

[MartinT]

Give each cap set a few days to settle, Jim. They take time to open up. However, your observations about bass tightening up and perhaps appearing less powerful match mine. I don't remember midrange (vocals) lacking presence, though. That sounds like new or poor caps, I think.