Headphones vs Speakers

[Opathy]

I’ve been comparing my headphones to my full range floor standing speakers. Two different pairs of headphones:
Sony 7506 ( Very bright to my ears) and Sennheiser HD 650’s
Speakers: IMF Studio TLS 50 floor standing transmission lines.
To my surprise the IMF’s sound virtually identical from top to bottom compared to the Sennheisers.
I’m feeling really good about my 50 year old IMF’s! I’ve had them since new and rebuilt the crossovers a few years ago with ESR equivalent capacitors from the UK and replaced the midranges with Monocor drivers and tweeters with Audax drivers. Sound like they did when new. What Im taking from this is that for a set of loudspeakers in a room to compare to a top flight pair of headphones shows that the speakers in my listening room are top performers.
Thoughts?

 

[Kingnoob]

My best headphones are the sennheiser hd 350bt and they definitely don’t outperform my better speakers Klipch icon , but they are a step up from my akg 240s that one side was going bad on. YouTube is my main usage I haven’t found another free site I can pick songs out on. I wish I could afford pricier speakers but my larger tv is going bad so I gotta replace it first …
Plus my sennheiser hd 350bt don’t make bass like a subwoofer does but they do go low for the price. Even if they go down to 20hz it’s not as loud as a sub. It feels more like 40hz.
I’m sure your speakers are far higher end…and your headphones. Terrible job market here for those new to workforce…