[abheybir]

Not able to decide which one to keep for life!! Initial impressions one has nice airy treble extensions while other has lush musical notes, what are your views on the same?

 

[Kammerat Rebekka]

Tell me about it! I think I have owned the first 50 pairs of Sennheiser 6 serie headphones and they all sound absolutely wonderful. I’d keep them all but tend to go slightly mad whenever I cross a certain amount of headphones. 8-10 cans usually triggers this and I look for something to sell off. I’m a huge music fan..not really a collector of headphones.

There are those who feel the two Sennies are quite complimentary..and then there are those who have seen some of the failed frequency response charts of both where they look like two drops of water.
There are obvious differences when the pads are new though, particularly in the bass. Personally I’ve always felt that the 600 sounds the most natural and true to life whereas the 650 is the warmer and more romantic of the two. Whenever I come across some of my old school prog albums from the 70s, it’s the 650 I reach for as it sounds easier on the ears on poorly recorded material.
I currently own the 580, 600, 650 and the 58X. I love em all but must admit to using way too much time with the daddyo to the 600, the HD580 Precision. I figure I’ll swing around to the others at some point…but yeah if this trend continues I may sell of a few down the line. My tastebuds decide in the end.
…which leads me to your particular luxury problem
I’d say keep em both for a while and see which one you end up reaching for the most. If it somehow ends up a tie? Keep em both!
If you feel the two are too alike to keep, then exchange one of them for the R70X instead, Maude Technical’s answer to the HD600/650..and thank me later
The R70X is like a cross between the 600 and 650 but with better bass quality and reach down low. It’s tuned similarly in the mids and treble and furthermore comes with 470 ohms worth of dampening factor, which makes it a great candidate for tube amps just like the classic Sennies.
Best of luck

 

[szore]

Just lurking; I bought the 660S Thursday, and just sold them today...They don't compare to my SendyAudio Aiva that i got open box for $450....

 

[abheybir]

Tell me about it! I think I have owned the first 50 pairs of Sennheiser 6 serie headphones and they all sound absolutely wonderful. I’d keep them all but tend to go slightly mad whenever I cross a certain amount of headphones. 8-10 cans usually triggers this and I look for something to sell off. I’m a huge music fan..not really a collector of headphones.

There are those who feel the two Sennies are quite complimentary..and then there are those who have seen some of the failed frequency response charts of both where they look like two drops of water.
There are obvious differences when the pads are new though, particularly in the bass. Personally I’ve always felt that the 600 sounds the most natural and true to life whereas the 650 is the warmer and more romantic of the two. Whenever I come across some of my old school prog albums from the 70s, it’s the 650 I reach for as it sounds easier on the ears on poorly recorded material.
I currently own the 580, 600, 650 and the 58X. I love em all but must admit to using way too much time with the daddyo to the 600, the HD580 Precision. I figure I’ll swing around to the others at some point…but yeah if this trend continues I may sell of a few down the line. My tastebuds decide in the end.
…which leads me to your particular luxury problem
I’d say keep em both for a while and see which one you end up reaching for the most. If it somehow ends up a tie? Keep em both!
If you feel the two are too alike to keep, then exchange one of them for the R70X instead, Maude Technical’s answer to the HD600/650..and thank me later
The R70X is like a cross between the 600 and 650 but with better bass quality and reach down low. It’s tuned similarly in the mids and treble and furthermore comes with 470 ohms worth of dampening factor, which makes it a great candidate for tube amps just like the classic Sennies.
Best of luck

@Kammerat Rebekka : Damn!! I was going to buy R70X, then stopped myself, considering that I am spending too much on gears and have problem of plenty; but now you got me intrigued again!! Thank you so much for your advice to give more time instead of jumping off to hasty conclusions for these two.

 

[Arniesb]

650 is more special. 600 lack the character, but with tube amp it could go either way...

 

[InvisibleInk]

Not able to decide which one to keep for life!! Initial impressions one has nice airy treble extensions while other has lush musical notes, what are your views on the same?

I faced this dilemma, but with the HD6XX vs HD600. It was a long, difficult decision. I ended up parting with the HD600. Don't regret choosing the way I did, but I miss the HD600 a lot. Keep them both if you can.

 

[limaaa]

I had both. Sold HD6XX. They were not engaging enough for me. HD600 sound more clear but still smooth that I like

 

[HiFiHawaii808]

Not able to decide which one to keep for life!! Initial impressions one has nice airy treble extensions while other has lush musical notes, what are your views on the same?

I got the HD650 first, then I got the HD600. Given their legacy, I will probably keep them both for life. I still enjoy listening to them from time to time. If I was forced to choose one, I would pick the HD600 because the tuning is more to my liking. But, one or both of these should be owned at some point in the life of an audiophile.

 

[jonathan c]

Not able to decide which one to keep for life!! Initial impressions one has nice airy treble extensions while other has lush musical notes, what are your views on the same?

Keep 600. If you sell 650, use proceeds towards good OTL tube amp (BHC, Feliks Elise, Feliks Euforia, Eufonika HM5, Woo WA2…and others…)

 

[abheybir]

@Arniesb and @jonathan c : I have Anode Acoustics OTL and Bottlehead Single Ended eXperimenter's Kit 3.0!!

 

[abheybir]

@Kammerat Rebekka : Ordered R70X....lol

 

[Mink]

I prefer the 650s. Both 600s and 650s have an almost identical tiny peak in the high mids, low treble (3-4K) that can cause glare and hardness, but with the HD600s it is more obvious. And I like HD650s little bass belly.

 

[abheybir]

I prefer the 650s. Both 600s and 650s have an almost identical tiny peak in the high mids, low treble (3-4K) that can cause glare and hardness, but with the HD600s it is more obvious. And I like HD650s little bass belly.

Even I have observed the same, vocals are totally identical. On other hand the fit is good with 650 where as the matte finish on 600 looks more beautiful. I have purchased both latest variants and as per lot of people sennhieser has changed the tuning a bit on new 650 making it slightly more lush and wide. I think I should give them more time and see which one grows on me more.

 

[jonathan c]

@Arniesb and @jonathan c : I have Anode Acoustics OTL and Bottlehead Single Ended eXperimenter's Kit 3.0!!

You have in another thread a photograph of the Anode Acoustics OTL - very nice! !

 

[Rattle]

I have pairs of both and always will.