In the audio world there aren't many low cost - high quality film caps. Some of the ones commonly available are a little edgy sounding, add sssh, and sing along with the music due to loose windings, voids or poor quality films etc.. Obbligato caps are made with extra tight winding, no voids and thick coated aluminum film imported from Germany. Lead outs are soldered copper, solid core for the dry types and for most of the oil types. Spec'd at 5% but on average much closer than that. Sound can be subjectively described as smooth and easy.

Consider these to be the equal to supreme or premium series film caps.

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Continuing to improve on the already excellent design, Obbligato is producing the Ultra Premium version using an improved film giving a better performance (sound is smoother and base deeper) and a higher DC operating voltage of 1000Vdc which allows use in even 211/845 circuits.The metal case now is non-conductive treated.
The Ultra Premium values are slowly replacing their Gold premium counterparts.