Jason,
I've been reading reviews on your Spectral DMA-260 and the reviews say it has plenty of bass. That just means it had plenty of bass when the owner or reviewer used his speakers, not your Aviors.
If you can remove your pre-amp from the system and go direct from your DAC as 'rvnye' suggests, this would start to isolate where the problem may be. That adds credence to auditioning the Devialet as it will remove both of your Spectral components from the audition.
Make sure your dealer configures the Devialet properly for you or shows you how to use the online configurator. They may have a specific configuration for their demo environment.
I've been reading reviews on your Spectral DMA-260 and the reviews say it has plenty of bass. That just means it had plenty of bass when the owner or reviewer used his speakers, not your Aviors.
If you can remove your pre-amp from the system and go direct from your DAC as 'rvnye' suggests, this would start to isolate where the problem may be. That adds credence to auditioning the Devialet as it will remove both of your Spectral components from the audition.
Make sure your dealer configures the Devialet properly for you or shows you how to use the online configurator. They may have a specific configuration for their demo environment.