Dual Op Amp, ss3602 Replacement HiFi Amplifier Board, Grade Sound Amplifiers, for MUSIKVEREIN 3602 Dual Op Amp, Used in Decoder, Music Player, Preamplifier, Headphone Power Amp,

Ok these came packed in a small cardboard box and all have arrived undamaged so far. I wouldn't say great packing (Anyone who has purchased on Ali exp know good packing) I can definitely tell the difference in my sound. Everything is a little louder and much more detailed.. very nice soundstage. I have now purchased 4 of these little guys, 2 fir my Fosi ZD3 and 2 fir my Fosi ZA3. Holy freaking wow this sounds good. I noticed the biggest improvement when I plugged into the ZD3, possibly because it's the first chain. I am planning to purchase 2 of these 3602's from Sparcos to see if there is a difference and if so how much. I'll try to post my findings on here. But at this price point you really can't go wrong guys!!

Very good product that performs as advertised with upgraded audio performance.

Using a pair of them with burson audio vivid V6'S in a pair of fosi audio mono v3's, very happy with them. Highly recommend