Sennheiser HD 600 Impressions Thread
Sep 10, 2021 at 10:03 AM Post #21,691 of 21,918

bagwell359

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The HD600s aren't too hard to drive, at least not like the HE-6's.

HE-6's like most planar headphones are low ohm affairs, which are well driven by amps with ample WPC. My Rag 1 certainly delivers lots into the planars I've plugged into it - such as the HE-6 6 screw and the HE-6se (16 wpc max output). In fact the stories of people using 60, 120, 200 WPC - makes me fear for the health of the HE-6's when a cartridge is dropped.

OTOH higher ohm cans (such as the 300 ohm 600) don't seem satisfied by my Rag 1. On my Bottlehead Crack w/ speedball OTL amp the 600 now has ample bass from 35-60 Hz, much better headstage, and a slight liquid romanticism not explained by just WPC (since the Rag 1 delivers 3X the juice to the 600 than the BHOC). Earlier in the thread the technical reasons have been examined, anyone should feel free to check it out.

All I know is I never listen to the 600's on the Rag 1 since I finished my BHC.

Headstage goes from:

/```\
|,,,,,|

to:

___/-------\___

not perfect but much wider, with a very deep and wide centerfill, and yes slightly buckled on both sides of the center. Very enjoyable with 3-6 players in jazz, classical, or audiophile new music.

Bass? BHC Fills in the sag of the 600 starting gently at 85 Hz, and starting to fall like a stone under 50.

Own a 600, if you haven't had it on a capable OTL I don't think you have heard it.
 
Sep 10, 2021 at 11:24 AM Post #21,692 of 21,918

CJG888

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Now try a truly modern, high power OTL:
86A7709D-412D-49AA-8E02-D099831E2BD3.jpeg
 
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Sep 10, 2021 at 11:00 PM Post #21,693 of 21,918

theaudiologist1

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HE-6's like most planar headphones are low ohm affairs, which are well driven by amps with ample WPC. My Rag 1 certainly delivers lots into the planars I've plugged into it - such as the HE-6 6 screw and the HE-6se (16 wpc max output). In fact the stories of people using 60, 120, 200 WPC - makes me fear for the health of the HE-6's when a cartridge is dropped.

OTOH higher ohm cans (such as the 300 ohm 600) don't seem satisfied by my Rag 1. On my Bottlehead Crack w/ speedball OTL amp the 600 now has ample bass from 35-60 Hz, much better headstage, and a slight liquid romanticism not explained by just WPC (since the Rag 1 delivers 3X the juice to the 600 than the BHOC). Earlier in the thread the technical reasons have been examined, anyone should feel free to check it out.

All I know is I never listen to the 600's on the Rag 1 since I finished my BHC.

Headstage goes from:

/```\
|,,,,,|

to:

___/-------\___

not perfect but much wider, with a very deep and wide centerfill, and yes slightly buckled on both sides of the center. Very enjoyable with 3-6 players in jazz, classical, or audiophile new music.

Bass? BHC Fills in the sag of the 600 starting gently at 85 Hz, and starting to fall like a stone under 50.

Own a 600, if you haven't had it on a capable OTL I don't think you have heard it.
I don't own an HD600 but I own a headphone with almost the same power requirements (R70x). On high gain It reaches unbearable levels at 2/5 volume, except for romantic which I have to turn to 5 but I do that even with my low impedance headphones since it's very dynamic. It gets loud, the soundstage and headroom are just as good if not better than my low imp headphones. Maybe the bass could be slightly better as the bass requires a bit more power, but the bass is still powerful.

All my music get as loud on my R70x as my low imp headphones. My amp is a slight bit weak but it still does 110dB peaks and drives my headphones very well. You don't need 10000 Gigawatts like you think. Maybe just a bit more mW for extra headroom and to maybe reach 115dB. An amp is also more than just power, so it maybe that your new amp is just better besides just more power.
 
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Sep 11, 2021 at 7:03 AM Post #21,694 of 21,918

CJG888

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The R70x is pretty efficient, and easier to drive than some have claimed…
 
Sep 11, 2021 at 8:51 AM Post #21,695 of 21,918

bagwell359

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I don't own an HD600 but I own a headphone with almost the same power requirements (R70x). On high gain It reaches unbearable levels at 2/5 volume, except for romantic which I have to turn to 5 but I do that even with my low impedance headphones since it's very dynamic. It gets loud, the soundstage and headroom are just as good if not better than my low imp headphones. Maybe the bass could be slightly better as the bass requires a bit more power, but the bass is still powerful.

All my music get as loud on my R70x as my low imp headphones. My amp is a slight bit weak but it still does 110dB peaks and drives my headphones very well. You don't need 10000 Gigawatts like you think. Maybe just a bit more mW for extra headroom and to maybe reach 115dB. An amp is also more than just power, so it maybe that your new amp is just better besides just more power.
That's interesting. I'm quite sure there are at least 10 posters in this thread that found what I found - unusually better sound out of OTL amps vs SS amps on the HD-600 - including SS amps with the subtle abilities of Class A and a Class AB bludgeon in one - such as the Ragnarok. The Ragnarok delivers 3x the power to the HD600 than the BHC, yet the 35Hz - 80 Hz tells the tale in every type of music. Declining 10 db from 80 Hz to 35 Hz on SS. Not sure of the OTL measurement but its a substantial amount more (est .65 at least of the missing Hz) and yes it falls off at 35 indicating limits of the can. You can partially replace the missing Hz with an EQ, but the 35-45Hz area doesn't sound right. And you don't get the serious improvement in headspace or the liquid coherence from an EQ.
 
Sep 11, 2021 at 9:21 AM Post #21,696 of 21,918

theaudiologist1

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The R70x is pretty efficient, and easier to drive than some have claimed…
The HD600s and R70x are both 102dB/V. the HD600s are 2dB less sensitive (97dB/mW vs 99dB/mW although diyaudio put the HD600 at 100dB/mW) but the R70x has more impedance (470-900Ohms vs 300-600Ohms).

That's interesting. I'm quite sure there are at least 10 posters in this thread that found what I found - unusually better sound out of OTL amps vs SS amps on the HD-600 - including SS amps with the subtle abilities of Class A and a Class AB bludgeon in one - such as the Ragnarok. The Ragnarok delivers 3x the power to the HD600 than the BHC, yet the 35Hz - 80 Hz tells the tale in every type of music. Declining 10 db from 80 Hz to 35 Hz on SS. Not sure of the OTL measurement but its a substantial amount more (est .65 at least of the missing Hz) and yes it falls off at 35 indicating limits of the can. You can partially replace the missing Hz with an EQ, but the 35-45Hz area doesn't sound right. And you don't get the serious improvement in headspace or the liquid coherence from an EQ.
That could be the reason. Many say the HD600s sound better with tubes than solid state. That could simply be preference as I heard tubes are warmer than solid states.
 
Sep 11, 2021 at 1:46 PM Post #21,699 of 21,918

omegaorgun

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Hi Guys, I need Your Help

I've an ALL IN ONE Ampli+Dac by FX-AUDIO
The model is FX-AUDIO X6MKII
Taking a look at the specs I've found this:

No chance to find The Output impedence of The Amplifier,I've find This

Output Power 940 mW @ 16 Ohms, 900 mW @ 32 Ohms, 700 mW @ 64 Ohms, 450 mW @ 120 Ohms, 200 mW @ 300 Ohms.

My question is: Is this Amplifier capable to drive HD600 (my next purchase) safely?

I'm using this calculator

HD600 Power Needed

Safe 85 db 0.07 mW
Moderate 100 db 1.98 mW
Fairly Loud 110 db 20.01 mW
Very Loud 115 db 63.08 mW
Painful 120 db 199.69 mW

If I f I have correctly interpreted the numbers, to manage the Peaks of Volume, I need 199.69 mw
My amp is able to manage 200mw at 300 ohm
Is it correct?
I have a DAC-X6 here I could test, the original one has high gain jumpers.

I'll throw a recently aquired hd600 on it.
 
Sep 11, 2021 at 1:52 PM Post #21,701 of 21,918

omegaorgun

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Agree with the 650 cable. I got these relatively inexpensive pads on Amazon and they are a treat - I like the leather and they have a built in nylon dust cover that, to me, is an improvement over the stock foam:

https://www.amazon.com/dp/B07B9M6GVV/ref=cm_sw_r_sms_api_glt_fabc_WFKPNGZF66MD7MBAY500

With these pads - in combination with the custom cans copper weight mod - my HD600 are supercharged: bass to die for, glorious mids (as always), and delicious, detailed, non-fatiguing treble. I’m in love all over again.

FE895E6F-1409-459C-9127-572AC9AFDEC9.jpeg
I can vouch for these cables, super cheap and feel premium. They make XLR versions. The 6.35mm for IEMs is also handy for desktop use.

Youkamoo 6.35mm https://www.amazon.com/dp/B08VRWXS1...abc_VZRV2SHBABCAM61RGJB7?_encoding=UTF8&psc=1
 
Sep 11, 2021 at 1:54 PM Post #21,702 of 21,918

omegaorgun

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Thanks Bro,I Appreciate..I NEVER open the Box and modify the gain..I Don't Know of Is set Low/medium or High..
There are two jumpers just for low and high gain. Ill take some pics.

I've also have changed the opamp and power adapter. I think in high gain it's doing about 1000mw @32 ohm which is very decent especially for the price.
 
Sep 11, 2021 at 4:25 PM Post #21,704 of 21,918

CJG888

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I find myself using the R70x at a lower volume setting than the HD600 to achieve the same subjective volume level (6C41C OTL amp).
 
Sep 11, 2021 at 7:58 PM Post #21,705 of 21,918

omegaorgun

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Thanks Bro,I Appreciate.. Have you MK2 or the previous model?I NEVER open the Box and modify the gain..I Don't Know of Is set Low/medium or High..
Runs them fine on low gain, gets very loud. I will up the gain tomorrow, but pretty sure it's gonna adequate. @AxeMadman81

LM4562NA is the opamp I use and got an adapter with 2a instead of 1 or 1.5a. not sure it makes a difference but supposedly its better for power hungry cans.

Reddit - headphones - FX-Audio Dac X6 gain jumpers https://www.reddit.com/r/headphones/comments/5rk667/fxaudio_dac_x6_gain_jumpers/

A Fiio K5 pro might also he a good option or the Zen Can, not sure how the Zen DAC would fair.
 
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