Do someone compared these mundorf caps ?

[ermes]

Mundorf Supeme vs. Mundorf Supreme silver/oil
Mundorf MCap vs. Mundorf RXF

who compared them is sound differences ?

t.i.a.

[DavidL]

Tell you what, you buy them and do some DBT on them and report back to us your findings.

[jacubus]

Here's one opinion
Humble Homemade Hifi

[DavidL]

"Opinion" is the correct term there. No DBT or SBT at all. He does state from the beginning that the tests are subjective.

[system7]

The equivalent circuit doubtless has some aspect of reality, and microphony can't be discounted, but we would suspect rattling coils as being far worse offenders. It's really not possible to make a 10uF capacitor out of pure gold foil and polyethylene without it being the size of a car battery though...

I'll settle for fat yellow 400V polypropylenes at £5 a throw. No snake oil for me!

Perhaps the crossovers should be in the next room though? I used to do that with my turntable.

[AllenB]

Capacitors do make a difference but at an order of magnitude or two below more typical speaker designing issues.

Now, the standard Mcap is good. If you can't make a very good sounding speaker with them then you have other problems.

[system7]

There's a very interesting and simple apparatus you could make to test capacitors sound quality, in fact I'm surprised no-one has done it yet!

You use the thermocouple idea to balance a system of two capacitors:



You then apply DC or maybe a 3KHz sine wave to this system. The loudspeaker (which may need a little balancing with potentiometers or varicaps to get exactly balanced) should then produce NO OUTPUT.

If the capacitors are microphonic, tapping one should produce an output on the speaker exactly like the distortion a capacitor might make. In fact you could place capacitors of different types (maybe even an electrolytic) in each arm, and the difference will be audible. Oh, I amaze myself sometimes!

[DavidL]

Originally Posted by system7

There's a very interesting and simple apparatus you could make to test capacitors sound quality, in fact I'm surprised no-one has done it yet!

You use the thermocouple idea to balance a system of two capacitors:



You then apply DC or maybe a 3KHz sine wave to this system. The loudspeaker (which may need a little balancing with potentiometers or varicaps to get exactly balanced) should then produce NO OUTPUT.

If the capacitors are microphonic, tapping one should produce an output on the speaker exactly like the distortion a capacitor might make. In fact you could place capacitors of different types (maybe even an electrolytic) in each arm, and the difference will be audible. Oh, I amaze myself sometimes!

Well.........one problem with the above is that if the two caps being compared are not exactly the same value then of course you will get some sound out of the speaker. If the capacitance and ESR differ then yeah you will get sound out of the speaker. For the tapping test it sounds like a good idea.I would think a much better "test" would be doing a SBT or a DBT if you think one cap sounds different from another.

[system7]

Originally Posted by DavidL

Well.........one problem with the above is that if the two caps being compared are not exactly the same value then of course you will get some sound out of the speaker. If the capacitance and ESR differ then yeah you will get sound out of the speaker. For the tapping test it sounds like a good idea.I would think a much better "test" would be doing a SBT or a DBT if you think one cap sounds different from another.

No idea what a SBT or DBT is my friend. Sometimes I think people here speak a special form of techno-gibberish!

It's just the old null-impedance idea familiar to all radio engineers. It assumes you make some effort to balance the bridge, but the surprising thing is it can be done in the resistive arms which is rather straightforward.
AC bridge circuits : AC METERING CIRCUITS

What makes it particularly powerful, is you can balance a series and parallel LCR circuit, for instance, which is useful to equalise a loudspeaker impedance or fit a impedance matching LC circuit.

FWIW, Troels Gravesen noticed Jantzen Superior Z cap did rather better than standard polyprops in a midrange crossover, "night and day!" he said, so there's something in it.

There is one serious issue here: The quality of the 88 uF to the midrange. Initially I ran 82 uF* standard polyprop caps bypassed by 1 uF Superior Z-cap. After several hours of listening I pooled all my Superior Z-caps to make 84 uF and replaced the standard caps. Sorry to say, it's night and day. Any standard polyprop sounds compressed compared to the Superior Z combo. Eight times 22 uF quality caps don't come for nothing, but once we've heard the super caps vs. standard polyprops, it's very clear there's no free lunch here.

http://www.troelsgravesen.dk/OBL11.htm

[pooge]

Originally Posted by ermes

Mundorf Supeme vs. Mundorf Supreme silver/oil
Mundorf MCap vs. Mundorf RXF

who compared them is sound differences ?

t.i.a.

Haven't compared these but have found the Supreme S/O to be too bright for my taste. In comparison, I found the Multicap RTX to be more listenable. Not that I settled on the RTXs after extensive cap comparisons. I just happened to have them to compare with the S/O, and much preferred them.