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Old 18th July 2011, 01:43 PM   #121
EUVL is offline EUVL  Europe
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Join Date: Oct 2003
I never say anything like my design is better than others.

But for those few who bothered to build one, they all love it.
Especially if you have a low impedance can (like Grado or AKG), which the HD555 probably isn't.

Not that it will sound bad on a 555, but you are not using its current delivery capability to the full.

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Old 18th July 2011, 04:20 PM   #122
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What is the impedance on the Grado or AK? Senn HD555 is around 50R.
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Old 20th July 2011, 05:58 AM   #123
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Location: Jakarta
@Dr.H: Grado usually is 32ohm. AKG depend on models, 62ohm to 120ohm.

HD555 at 50ohm should be fine too... HD555 (and most Sennheiser phones) is not a current hungry phones

It is not the impedance itself, but the combination of low impedance + lower sensitivity that makes Grado and AKG need more current to really sing. While Sennheiser phones are usually highly sensitive (+ high impedance on the HD600 and above models)
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Old 20th July 2011, 06:01 AM   #124
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Location: Jakarta
Copied my question from here to here...

@Patrick: sorry, for the very basic questions:
1. is this a unity gain amp (or not)?
2. could I put a potentiometer in the input?
3. what is the [maximum] acceptable preceding stage (source or pre-amp) impedance before the DAO?

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Old 20th July 2011, 03:11 PM   #125
EUVL is offline EUVL  Europe
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Answered at the other place.

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Old 5th August 2012, 07:54 PM   #126
tpsorin is offline tpsorin  Romania
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Join Date: Jun 2005
Location: Timisoara
How will this amp compare to commercial amps? I am thinking of lower price commercial amps (<150USD).

I plan to use it with HD600. Is it worth bothering with it if i have Xonar Essence ST?

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