Best sounding headphones you have owned?

I was a soldier all my life & now retired so I've never had deep pockets for audio gear & being a firm believer in trickle down tech I have always looked to the manufacture's for the best value in their product lines.After extensive demos of the TOTL from Audeze,HiFiMan,Focal,Sennheiser,Grado & AKG I discovered I like the HiFiMan house sound,settling on the Sundara for exotic driver tech & the absolutely amazing iBasso SR-1 limited editions(500 pair)for dynamics...
 Where the Sundara is virtually dead neutral & fast as lightning,the iBasso is relaxed,lush,dripping with harmonic richness & tonal color that is not unlike the finest 300B amplifiers...

@freediver Sounds like you found a great match, and I’m obviously with you on the Hifiman sound.  Congrats and enjoy!  Oh yeah, and most importantly, thank you so much for your service!!!

Audeze LCD-4 are my best, but the Sony MDR-Z1R are a very close second for a lot less money.

State of the art sound for a relatively low cost is one of my headphone systems:

• RAAL CA-1a (like regular headphones, unlike the RAAL SR1a) ($2000 naked version)
• RAAL TL-1a speaker adapter box ($800)
• Schtt Mjolnir preamp ($1100)
• Schitt Aegir amp ($800)
• Benchmark DAC3B ($1700) (dual duty with my 2-channel)

This above setup is so good that I threw out all the shipping boxes. I live close by to RAAL and Schitt if service is needed. I cannot easily sell this gear now. I also use the more expensive RAAL SR1a phones with the above setup. 

😊State of the art sound for a relatively low cost is one of my headphone systems:

Hidizs dac+equalizer+battery= 200 bucks...( low noise floor)

Sansui alpha 607i = 300 bucks ( one of the best amplifier ever designed by Sansui)

AKG K340 the only really hybrid headphone ever made ( the electrostatic cell is not a super tweeter as in the Dharma case) = 100 bucks ...

The K340 optimized( it takes me 6 month to figure out his working) can give an out of the head speaker like experience with natural timbre perception and deep bass ...

At 600 bucks i beat everyone ... It is my main audiophile system ... Even if i like the small speakers system i own ( low cost) which modified beat all headphones i ever listened to save the K340 ..

I apologize to yyzsantabarbara for my irresistible urge to bragg about my own low cost high end system ...😊

I am sure he will laugh and forgive me , thanks to him ...

I am certainly curious to listen to the Raal ... I will be afraid to buy one without listening before so astounding are my K340 the best headphone in the world in 1978 even better than Stax because of deep bass and out of the head experience with more natural timbre thanks to the passive internal resonators of Dr, Gorike and his complex dual acoustic chamber accomodating the two cells dynamic and electrostatic one behind the other ......