You don’t need a more powerful amp. Your speakers are 8 ohm with a sensitivity of 102dB, very efficient. The fact that some songs are loud proves you have a good amp/speaker match.
Try using the analogue output of the Node and plug the RCA cables into the Pass. I assume you use the DAC to control volume. Use the volume control on the BluOs app and compare with the volume going through the Dac.
Warning...Start with very low volume on the app.
Try using the analogue output of the Node and plug the RCA cables into the Pass. I assume you use the DAC to control volume. Use the volume control on the BluOs app and compare with the volume going through the Dac.
Warning...Start with very low volume on the app.