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I've a Topping A30/D30 combo pairing with a DT 880 Pro and ATH-M50x headphones. Thinking of doing some OpAmp rolling to improve on my present setup. I'm no audiophile and is confuse on the number of OpAmp I can roll with my Topping combo.

Have narrow down to the Burson OpAMp V5i D/S. Which version should I get - V5i Dual or the V5i Single? What's the different between the two?

Alternately, off-load my Topping and get a Asgard 3 instead.

Advise highly appreciated.

Thanks.