If you are interested in build your unique PK model I will gladly suggest this shell and driverBudget PK shelled, preferably flat sound signature?
Best PK driver (150ohm "red film" you can't find on Ali anymore, but Taobao still have them)
Another choice will be
https://www.aliexpress.com/item/32655431609.html
https://www.aliexpress.com/item/32801890526.html
https://www.aliexpress.com/item/32811888693.html
https://www.aliexpress.com/item/32993083989.html
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