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Old 26th September 2012, 03:36 PM   #11
jcx is offline jcx  United States
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according to Sennheiser HD414 - Wikiphonia the HD414 part number has been used for versions with an order of magnitude different Z



I reccomend more recent chips, benefiting from the complementary processes, advanced linearity internal designs sparked by the DSL, medical imaging markets that have improved specs even further in the last decade - if improved specs are the goal
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Old 26th September 2012, 08:28 PM   #12
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There are many differences. The TLE2072 has a -/+ 80ma output capability (per opamp in the dual package) which puts it way ahead of the competition.
Slew rate of around 35V/us, a wider operating voltage range..
yet they sound identical
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Old 26th September 2012, 08:51 PM   #13
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Originally Posted by Mooly View Post
Not so

There are many differences. The TLE2072 has a -/+ 80ma output capability (per opamp in the dual package) which puts it way ahead of the competition.
Slew rate of around 35V/us, a wider operating voltage range.......
While you are at this, why not try TLE2062 which are rated to drive 100-Click the image to open in full size. Loads?
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Old 26th September 2012, 10:07 PM   #14
batty is offline batty  Australia
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Maybe I should change the thread to extreme chip rolling, I am on limited budget so I take time to get around to these thing, just got a small tax refund so went for 3 options and thought I'd ask the question, original ic was a 353 in the Cmoy kit, can't remember what was in the Oatley, but the Oatley sounds better with the AD823 and the Cmoy better with the 2134......... so far

These are my 414s

HD414 50th Anniversary Edition

Released in 1995 to the 50th anniversary of Sennheiser GmbH & Co
[edit]
Technical specifications

Frequency Response: 18-21000 Hz
Type: Dynamic, open
Impedance (Nominal): 52 Ohms
Sound pressure level at 1 kHz: 94 dB +/- 2 dB
THD as per DIN 45500: < 0.9 %
Contact Pressure: ~2.8 N
Weight (without cable): ~80g
Connector: 3.5 or 6.3 mm (1/8" or 1/4") stereo jack plug
Connection cable: Oxygen Free Copper cable, 3m
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Last edited by batty; 26th September 2012 at 10:11 PM.
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Old 26th September 2012, 10:21 PM   #15
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How about the humble JRC4556? RS did a review of an ebay cmoy fitted with it at 1x gain, performed quite well. Plus they do a good job in the O2.
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Old 27th September 2012, 02:41 AM   #16
jcx is offline jcx  United States
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if I were building an amp for those numbers I would aim for clipping free 120 dB SPL peak drive

thats for dynamic headroom - not for continuous listening, I think the O2 design discussion ends up claiming ~110 dB is adequate so less could be acceptable to some

the 120 dB SPL dynamic peak clipping free goal would require ~ 7 Vpk, 140 mApk - it unlikely any amount of 20 yr old DIP op amp rolling will get you there - you have to choose the few parts or added buffers that can do it
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Old 27th September 2012, 03:02 AM   #17
qusp is offline qusp  Australia
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yes, well despite having myriad explanations for it, the O2 is not clipping free
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Old 27th September 2012, 06:53 AM   #18
Mooly is online now Mooly  United Kingdom
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Originally Posted by nereis View Post
While you are at this, why not try TLE2062 which are rated to drive 100-Click the image to open in full size. Loads?
These are more of a micropower opamp which would be great for battery life. AC performance is much lower for these though although they could be very useful in some projects.
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