The PrimaLuna / XA 30.8 combo would sound significantly different compared to the INT 150. IMHO, the PrimaLuna / XA30.8 would be the way to go, but it would help if you would tell us what speakers you are using, how your system sounds to you and what kind of improvement you would like to hear.
The PrimaLuna is an excellent preamp. I know of no other preamp/amp/integrated components at this price level that have gotten the number of awards and rave reviews that the PrimaLuna products have. The raves come from owners as well as reviewers.
Many times when we try to upgrade our systems we get a sideways move instead of an upgrade. It sounds different but not necessarily better. So for now I'd hang on to the PrimaLuna and see if you can listen to the Pass amps to determine if one or the other is what you want.
Reno HiFi will let you buy Pass amps (including used amps) with an option to return, but it does cost money to return an amp (shipping and restocking fees). It is one way to hear the amps in your own system, though.
The PrimaLuna is an excellent preamp. I know of no other preamp/amp/integrated components at this price level that have gotten the number of awards and rave reviews that the PrimaLuna products have. The raves come from owners as well as reviewers.
Many times when we try to upgrade our systems we get a sideways move instead of an upgrade. It sounds different but not necessarily better. So for now I'd hang on to the PrimaLuna and see if you can listen to the Pass amps to determine if one or the other is what you want.
Reno HiFi will let you buy Pass amps (including used amps) with an option to return, but it does cost money to return an amp (shipping and restocking fees). It is one way to hear the amps in your own system, though.