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Old 17th August 2011, 06:18 PM   #2551
Joachim Gerhard is offline Joachim Gerhard  Germany
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Now it looks like this ......
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Old 18th August 2011, 08:48 AM   #2552
lauret is offline lauret  Netherlands
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Quote:
Originally Posted by Joachim Gerhard View Post
Now it looks like this ......
Very artistic modification! Dammar is usually used to varnish oil paintings, but artists
usually use turpentine as a solvent (not mineral turpentine). Does that work as well for this
use?

And most importantly, how does it sound right now?
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Old 18th August 2011, 01:11 PM   #2553
Joachim Gerhard is offline Joachim Gerhard  Germany
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Dammar in turpentine should work too and it smells better.
I have not coated yet but as is now it sounds better then the Sennheiser HD280 pro.
The bass is more clean an clear, the HD280 is a little "one note" boomy there, and the midrange-treble is less coloured and more even. The upper treble seems to be better resolved. All in all less transducer, more music.
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Old 18th August 2011, 10:41 PM   #2554
Joachim Gerhard is offline Joachim Gerhard  Germany
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The Magnum Opus PCBs have arrived. I spend most of the day stuffing them. This is how far i came.
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Old 19th August 2011, 02:55 PM   #2555
jackinnj is offline jackinnj  United States
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If you've got matched J74/K170, why not:
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Old 19th August 2011, 03:04 PM   #2556
Joachim Gerhard is offline Joachim Gerhard  Germany
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Correct. That way is better.
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Old 19th August 2011, 03:05 PM   #2557
Joachim Gerhard is offline Joachim Gerhard  Germany
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200 Ohm is maybe a little high.
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Old 19th August 2011, 03:06 PM   #2558
Joachim Gerhard is offline Joachim Gerhard  Germany
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But R2, R4 could also be at bit lowered.
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Old 19th August 2011, 03:41 PM   #2559
Joachim Gerhard is offline Joachim Gerhard  Germany
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I am thinking about 5 Ohm for R2, R4 and 50 Ohm for the trimmer.
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Old 19th August 2011, 04:52 PM   #2560
jackinnj is offline jackinnj  United States
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Quote:
Originally Posted by Joachim Gerhard View Post
200 Ohm is maybe a little high.
It's 200 ohms in parallel with 10 ohms on each side. If you've got a spectrum analyzer (sound card fine) you can adjust to null the harmonics in getting the gain of each side more or less equal.

I do have the "Rabbit Hole" built -- and think I'm going to stop there for the moment!
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