Meridian Unplugged - Powered by MrTechGuy.co.uk Forums Discussion Meridian - Systems Is this a valid test to see if my ears will hear benifits of Apodizing Upsample?

A problem with testing for HD621 improvement is that the test has more than one variable. In addition to the HD621 as one variable you also have the interface as a second variable. The test with the HD621 requires the HDMI interface whereas the test without the HD621 requires the SPDIF.

Assuming the interface can be ruled out is a leap of faith. But this assumption is both reasonable and necessary to do the test.

Having said that, my experience is that you may not be able to notice the difference in a few minutes. But after listening to the HD621 all day then removing it, you will want the HD621 back in the loop.

To me, the most prevalent thing is better bass. Even aging ears should hear this. Second is less fatigue. I can listen at higher volumes all day long without the Joe's Garage scenario (mother screams "turn it down!").

Adding one more point: HD621 makes music sound more accuracte.