Not impressed with the Topping E30? I don't believe that
. I had used to own a Topping L30 with a AKG 7XX, very good pairing.
Why do I mention the AKG 7XX? AKG 7XX is the cousin of the AKG 702, which is also the cousin of the AKG 701. The AKG 7XX goes for around $80 to $130 USD on eBay. So buying an amp over $200 for these would be kind of a waste.
If I recall the Topping L30 outputs more power and does better overall than the Topping A50s. The SMSL SH-8S does output more power and does better overall then the Topping L30 and costs the same as the Topping A50s.