Yes, I noticed that too, and I can only offer up the following to try and explain it.

The Golden Ears measurements show a slight bass bump in the 7506 not present in the ZX700, so that could be what I perceived as increased bass in the older model. Here’s their ZX700 measurements.

And their 7506 numbers.

ZX700’s and 7510’s also don’t measure identically.

It’s also totally possible that something was wrong with my ZX700’s. They were new…but they sat around in a box for years and years.

Also, I was really hamstrung in my ZX700 review and had to listen with third party pads due to the pad degradation mentioned in the review. I’d love to someday hear a version with pristine original pads, and then I imagine I’d have a sound signature much closer to the other reviews you’ve seen. But I had to make due with what showed up in the box.

I can only report what I hear! I don’t go look at other reviews when I’m creating mine, and I only sometimes go and check measurements if I feel like I’m going insane and need some numbers to ground me, hahaha. But usually it’s just “here’s subjectively how I hear these.”

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I do radio voice work by day, and write by day and night. I studied film and production. I love audio, design, and music. Also video games.

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