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Old 12th March 2012, 05:17 PM   #1
dejanm is offline dejanm  Austria
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Default Pass Headphone Amp

When Nelson Pass is going to make a headphone amp, either under the Pass Labs brand name or as the First Watt unit ?

I believe that there is a market for a such product and we haven't seen here many DIY works either. I can recall only one guy did an adaptation of Aleph circuit to make a headphone amp ...
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Old 12th March 2012, 05:55 PM   #2
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There are some Pass inspired circuits around, haven't built any of them myself though, so I can't comment any further.

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Old 12th March 2012, 06:45 PM   #3
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Old 13th March 2012, 02:00 PM   #4
dejanm is offline dejanm  Austria
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We need some ultimate Pass design for the headphone amp ... I went quickly through posted links but except one Aleph adaptation, everything else is not really Nelson Pass ...
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Old 13th March 2012, 02:30 PM   #5
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There is an Aleph Mini build here -- 6moons audio reviews: Reality Check with Terry Aben

The reviewer is completely in love with it!

But no details on how to build it...
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Old 13th March 2012, 03:06 PM   #6
qusp is offline qusp  Australia
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I would have thought that a pass headphone amp would need carefully chosen headphones to work to satisfaction due to lower damping factor than most pure headphone amps. ive toyed with the idea myself on many occasions and figured the F4 for a good candidate
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Old 13th March 2012, 03:35 PM   #7
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Quote:
Originally Posted by qusp View Post
carefully chosen headphones to work to satisfaction due to lower damping factor than most
hi-hi

(DF is loudspeaker impedance divided by source impedance)
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Old 13th March 2012, 04:07 PM   #8
Zen Mod is offline Zen Mod  Serbia
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where you see loudspeakers in headphones ?

(especially when they're around short circuit)

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Old 13th March 2012, 04:43 PM   #9
qusp is offline qusp  Australia
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hmm not quite sure i'm with you jacco; i'm aware its an interaction between the 2, thus the need for carefully chosen headphone impedance to meet the higher than normal output impedance of an aleph headphone amp. myself i'm not even that convinced its a factor with most headphones, given a low enough outputZ and taking into account sufficiently electro-mechanically damped headphone construction, but last time i said that i got shot down. most references i have seen refer to grados

ahh i see where i created confusion, with the word 'factor' my apologies.

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Old 13th March 2012, 04:50 PM   #10
6L6 is offline 6L6  United States
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Damping Factor is the speaker's impedance divided by the amp output impedance. (Just like Jacco said)

Looking at the Firstwatt website, the Aleph J (The closest thing to a 'normal' Aleph) has an output impedance of 0.4ohm.

So that amp has a damping factor of 20 into an 8ohm load 8/.4=20

Into the low impedance Grado (32ohm) headphones it would have a Damping Factor of 80 32/.4=80

Into a 320 ohm headphone the DF would be a very good 800!
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