[loller]

Hi Guys! I will start by saying 2 things: i'm a total noob. i've read some threads here but i haven't learned much (reading isn't as useful as listening) and sorry for my english, i'm italian.
 
More then a years ago i've bought a pair of sennheiser hd598 and a CmoyBB from jds labs, powered by a 12 v - 0,5 A adapter, for home use on my pc.. And i'm quite satisfied.. But i would like to try changing the opamp.
 
any suggestions??
 
the cmoy comes with an OPA2227, i like the soundstage effect and the precision of this (especially in bass) in comparason with the non-amplified set but sometimes it sounds less involving and has a weaker impact..
 
thanks! ^^

 

[tomb]

http://www.tangentsoft.net/audio/opamps.html
 
The first one you might try would be the OPA2132.  It's a very slight variation on the classic CMoy opamp, the OPA2134.  There are many others in tangent's reviews.  Some are only available in SOIC-8, but there are Brown Dog adapters available from here: http://cimarrontechnology.com/.  If the opamp is not too fast, these work well in a DIP-socket and you can even get dual-to-single adapters if the particular opamp is not available in a dual form in a single chip.
 
I never really liked the OPA2227, but as you may discover, preferences with opamps are variable from person to person.
 
 
Edit: Too many "2's" in "2134"

 

[wakibaki]

Ciao loller
 
Il tuo inglese è piuttosto buona, meglio il mio italiano, quindi nessun bisogno di chiedere scusa.
 
http://www.babelfish.com
 
w

 

[miniq]

OPA2134PA or 2132PA
 
They don't need any fine tuning or biasing really so can be easily swapped out without problem.

 

[Zigis]

I can recommend LM4562, sound much better than OPA2134.
I don't like OPA2227 too

 

[loller]

reading the forum, and the reviews from the link posted above, i have noticed that some people suggest AD8066 and AD8620.. this would be a direct swap?
 
edit:
and also can you please tell me how the sound would change with the opa that you reccomended? or what are their main characteristics..
thanks a lot!!! ^^

 

[tomb]

Quote:

reading the forum, and the reviews from the link posted above, i have noticed that some people suggest AD8066 and AD8620.. this would be a direct swap?
 
edit:
and also can you please tell me how the sound would change with the opa that you reccomended? or what are their main characteristics..
thanks a lot!!! ^^

No, it's not exactly a direct swap.  The CMoyBB, like almost any CMoy, is based on a dual-channel, DIP-8 form factor for the opamp.  Last time I looked, the AD8066 and AD8620 - while they are each dual-channel - are only available in SOIC-8.  So, you'd have to solder them to a Brown Dog adapter before you could plug them into the DIP-8 socket in the CMoyBB.