Pass labs INT60 or INT250 with JBL 4367?The JBL’s at 94db and 6ohms average, the INT60 will be fine.
As the INT60 Stereophile tested is actually 80w into 8ohm and 125w into 4ohms so into your JBL's 6ohms will be plenty, at around >100w.
https://www.stereophile.com/content/pass-laboratories-int-60-integrated-amplifier-measurements
Cheers George