Actually I believe the A40 series is using some of the same capacitors found in the ZX300 just not as many. So it might be worth giving the A45 some time to burn in. If you have 14 days to return it for example then why not give a 10 or 11 day trial just to be sure. I have been fortunate enough to have access to salesman samples when auditioning DAP's. Being able to audition well used DAP's gives you a good idea how the DAP can sound given the time to burn in.