Amazon.com: Koss Porta Pro On Ear Headphones with Case …

Yamaha HPH200 – these are open back on ears. Bass on both is very simillar. Warm and punchy. Yamahas slightly more detailed, but both are warmer and richer sounding than the Senns. The Yamahas are wider sounding with bit more punch in the drums. … Earbuds – GranVela® Mrice E100 EarBell… currently unavailable on Amazon, but £20 on eBay

https://www.amazon.com/Koss-Porta-Headphones-Black-Silver/dp/B00001P4ZH