Preamp Output Capacitor: Mundorf Supreme vs. Supreme Silver Oil


Anyone compared the bass response of these two caps?  I bought the Supremes for trial purposes and really loved what they did to my system's imaging (front to back layering) and immediately bought the Silver Gold Oil Supremes.  Unfortunately while they were smoother, more beautiful, and even better at imaging, they had no bass (actually, they lost bass as they broke in).  Anyone know how the Silver Oil's fit into the line?  

I'm using them in a Don Sach's DS2 Preamp ( https://systems.audiogon.com/systems/7983).  

Thanks.
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I have tried a lot of capacitors over the years and my finding with the Mundorf Silver/Oil is the same as mentioned above. If they maintained the sound of the initial 100 hours, it would be one of my favorite capacitors for a warmer tone. 
The capacitor I like for good tone as well as maintaining good detail is the DynamiCap. We switch over to these in our upper end Purity Audio Design Reference and Statement preamps with the Statement being the Stealth version.
For clarity and more 'in your face' the ClarityCap CMR are a very good capacitor. 

We have been looking at several options for coupling capacitors in our upcoming new tube preamplifier products for Purity Audio The only one I have left to evaluate is the ODAM. So far, my preference is the Deulund but these would increase the price of the product out of our selling price goals. My first choice so far is DynamiCap. Let's see how ODAM compares.