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With regards to audio v. non audio, this is one manufacturers take on it from their spec sheet: Overview KEMET's ALC10S Series of capacitors features improvements in general construction of the capacitors to achieve better results in audio, where fidelity of the waveshape is very important. Great attention has been paid to the construction details that can affect performance such as foil type, its connections and mechanical construction. Details of capacitance and case sizes are available in KEMET's slit foil capacitor range. Applications Modern electrolytic capacitors are designed for use in power supplies, thus, most aspects of their design have been optimized for this application. Some advances in design may not be beneficial in audio applications where the requirements of the capacitors are very different. KEMET has produced the ALC10S slit foil capacitors specifically for audio applications. Its patented design eliminates circulating currents in the aluminium foils. This spurious current flow on the capacitor plates is known to occur but not apparent in most applications.