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I just got mine about a week ago
I have burnt them in about 50 hours so far
I also own the 6XX
I noticed that the 6XX are quite a lot louder set to the same volume
any one else notice this Too or did I get an inefficient pair?
Welcome to the world of inefficient planars. Your Senns have a higher voltage sensitivity so they'll get louder quite easily compared to the 4XX that's both current and voltage hungry. They just need more power to reach the same listening levels. Power them properly and they sound really good for this price range.
Agree they do sound good
i just thought the 6XX were harder to power from reading the post there before buying them
Running them on a vintage Kenwood KR8010 (125 watts RMS) and they both sound great
Matches my experience. The HD6XX volume with the Apt Holman volume knob at 10PM requires moving the knob to approximately 12 o'clock to match levels using the HE4XX.