Nobody has said that the 407 is better than the 507. What has been said is that the 407 with the 507 ear pads is almost identical in sound to the 507. As with most quality headphones both will scale for better sound with better amplification. The SRM252 may drive these headphones to acceptable levels to your ears, but they will certainly have not reached their full potential.
- 310 Posts. Joined 6/2012
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