catman Posted October 17, 2014 Posted October 17, 2014 G'day all, today I swapped out the OPA2134's in my DIY P06 and replaced them with LM4562's. I have tried them before and whilst impressed with their generally lower noise, sonically I was a little ambivalent about them, however after listening to them for a few hours today I have to admit that they are not too bad at all! There certainly seems to be an added sense of detail and whilst their 'sound' is different to the OPA2134, there is quite an endearing quality to the LM4562 'sound'. On paper anyway, the LM4562 is clearly the superior dual op amp and sonically I now think that it is quite agreeable as well! Regards, Felix.
Equaliser Posted October 17, 2014 Posted October 17, 2014 (edited) It is indeed not bad. You can try the LME47920HA's or the LME49990 (single opamp so you need 2 SOIC8's to a single dual DIP8 conversion) if you like the LM4562's sound signature. Edited October 17, 2014 by DefQon
catman Posted October 18, 2014 Author Posted October 18, 2014 (edited) A synergistic combination? G'day all, more tweaking and I ended up putting an LM4562 in the first (bass EQ) stage and an OPA2134 in the second (block gain) stage of my DIY ESP P06, and the combination sounds amazing with a dramatic sense of detail and 'attack', and musicality! I know that some of the learned amongst us on the internet elsewhere continue to tell us that op amp 'sound' is a myth, and in all honesty I might have been in that camp as well at one time, but no longer! My ears like what they hear with this combination. Regards, Felix. Edited October 18, 2014 by catman
catman Posted December 21, 2014 Author Posted December 21, 2014 (edited) G'day all, just adding to this old thread. Today I changed one of the op amp chips in one of my remaining DIY ESP P06's from an LM833 to an LM4562 making both op amp chips LM4562's. It really is a very fine sounding dual op amp if not the most 'musical', yet endearing in its own way. Listening to a (very) familiar record one does hear little musical details out of the very quiet background and although I might possibly describe the sound signature of the LM4562 as accurate/clean/almost anechoic in character, there is a total lack of any harshness and a general sense of 'roundedness'. Interestingly enough the first LM4562 that I tried (previously used but thought to be 'ok'), was faulty in that whilst it 'worked' there was a pronounced 'buzz' on the left channel. I suspect that I 'caused' the fault by running it at 18 volts split rail previously, beyond the documented upper limit of 17 volts split rail for the LM4562. One has to wonder why the LM4562's upper operating voltage limit is 'only' 17 volts? That's curious actually! In the end, I have to concede that the LM4562 is an excellent sounding op amp chip with very high performance and its noise figure is very low. Regards, Felix. Edited December 21, 2014 by catman
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