The FX Audio DAC-X6 is what I paired the SHP9500 when I first started my audio hobby.

https://www.amazon.com/FX-Audio-Digital-Decoder-Headphone-Amplifier/dp/B07TW2JQNN/ref=sr_1_1_sspa?crid=3NVP6YCJJJZY&dchild=1&keywords=fx+audio+dac-x6&qid=1608141540&sprefix=fx+a%2Caps%2C173&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExUVNISTcyS0hWSVhWJmVuY3J5cHRlZElkPUEwNjE2NDc2Uk5ESTMzU0EyUFdLJmVuY3J5cHRlZEFkSWQ9QTA0NTA2ODkxODhFVDdZNEJLRjRMJndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==

Great starter DAC AMP for $65.Mine has lasted 3 years. It is now hooked up to my TV.

While I really like the SHP9500 two other inexpensive headphones to consider if you enjoy more bass

are : Koss KPH30i $30

https://www.amazon.com/Koss-KPH30iw-Headphones-Microphone-Lightweight/dp/B075FDCYFD/ref=sr_1_1?crid=2DSZHO9EHUJBJ&dchild=1&keywords=koss+kph30i&qid=1608142051&sprefix=koss+kp%2Caps%2C171&sr=8-1

And HiFiman HE-35X on Drop $75

https://drop.com/buy/drop-hifiman-he-35x-headphones