HifiMAN HE-6 Planar Magnetic Headphone
Aug 26, 2018 at 11:42 PM Post #20,626 of 21,237
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Anyway to hook a HE-6 to a tube amp & not worry about problems or sound degradation?
Even if the tube amp is in the 20 watt range.
Not that I know of. Its not about how powerful the amp is. doesnt matter actually. the adapter should be used on a tube amp because of the design of the amp. I was tried a tube amp around 35 Watts, but ended up not liking the sound as much, so I just went another route. it was easier for me. But anyway, the adapter protects your headphones on a tube amp.

Also, make sure you do the math to figure out if your getting the right Watts into Ohms ratio. on a 20 watt tube amp, your not likely getting the recommended ratio. most people dont think of this.
 
Aug 26, 2018 at 11:56 PM Post #20,627 of 21,237
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This math is not correct, but its close enough for the layman. if your amp pushes 20 watts into 8 ohms. at 16 ohms, its about 10 watts. at 32 ohms, about 5 watts. you can see that the number of watts basically splits in half when you double the ohms. (no, this is not exactly right) The HE6 impedance is 50 ohms.

So if you jump one more from my "general" example. at 64ohms, your pushing around 3 watts. not enough to do it right.
 
Aug 27, 2018 at 12:25 AM Post #20,628 of 21,237

wuwhere

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Anyway to hook a HE-6 to a tube amp & not worry about problems or sound degradation?
Even if the tube amp is in the 20 watt range.

If your amp has output transformers the adapter will protect the output transformers from the impedance mismatch. You don't turn on and leave a tube amp on with output transformers without a load, 4, 8 or 16Ohms resistors.
 
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Aug 27, 2018 at 3:10 AM Post #20,631 of 21,237

Bonesy Jonesy

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I ran my HE-6 from a 250wpc vintage amp................just start with the volume down to the minimum.
Thank you for the information Oregonian. Much appreciated.
 
Aug 27, 2018 at 3:23 AM Post #20,632 of 21,237

Bonesy Jonesy

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This information on the internet regarding the connection of headphones direct to amp speaker connections. Interesting read. https://diyaudioheaven.wordpress.com/tutorials/power-amp-adapter/

According to this information the HE6 (50 ohms) should only be connected to an amp with max 50W / channel into 4 ohms and 25W / channel into 8 ohms with 4W going into the HE6's (within green watt ratings) up to a maximum of 80W / channel into 4 ohms and 40W / channel into 8 ohms with 6.4W going into the HE6's (within orange watt ratings) ! (see information & table below)


"Most of the newer Planar magnetic (Ortho dynamic) headphones can handle MUCH more power than normal headphones because of the way they are built. Most of them can be connected to power amps directly and will play beautifully on them. Headphones like the HiFiman HE5 and HE6 are best driven directly from power amps even. Belowthe table for 3W to 6W rated headphones."

"It’s easy to see these headphones are not easily blown up but it should be noted most planar magnetic drivers are somewhere between 32Ω and 60Ω in general. This means these headphones can be connected directly to amplifiers up to 40W but I would not recommend to connect them directly to higher power amplifiers."

hp-pow-3.png
 
Aug 27, 2018 at 12:39 PM Post #20,633 of 21,237

LarsHP

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Please note that - while the best sound is obtained without the adapter box and many have driven HE-6 with quite powerful solid state amps - practically all those who have blown their HE-6 drivers have exactly this in common. (I might not be aware of one or two who has blow their HE-6 drivers under other conditions - like blowing it while modding the headphone etc.)

In the official HiFiMan HE-6 manual the recommended max speaker amp power without using the adapter box is 70W (in 8 Ohm). In other words, your 140W amp is well above that.

I had a 12W Leben tube amp and used a 10 Ohm resistor across the terminals. That gave me 2W of effective power into HE-6, which is the recommended minimum power (according to the manual.)
 
Aug 27, 2018 at 2:22 PM Post #20,634 of 21,237

lawrence2357

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Please note that - while the best sound is obtained without the adapter box and many have driven HE-6 with quite powerful solid state amps - practically all those who have blown their HE-6 drivers have exactly this in common. (I might not be aware of one or two who has blow their HE-6 drivers under other conditions - like blowing it while modding the headphone etc.)

In the official HiFiMan HE-6 manual the recommended max speaker amp power without using the adapter box is 70W (in 8 Ohm). In other words, your 140W amp is well above that.

I had a 12W Leben tube amp and used a 10 Ohm resistor across the terminals. That gave me 2W of effective power into HE-6, which is the recommended minimum power (according to the manual.)
On the other hand, I accidentally ran my Zero dac in line out rather than pre out mode for a few seconds into my HE6 via a 1000wpc (4ohm) ice power amp and they survived unscathed much to my relief.
 

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