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Originally Posted by Harvey/ Ga /img/forum/go_quote.gif
I wonder how the LM6171's would do in place of the OPA134's ?? They seem to give me a nicer sound then the 134's, but the volume is less with my AKG 240's. Don't have the BUF 634's to try.
Not being a swifty with the data sheets, I can't see the difference.
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They would be very bright and clear from a first impression.
I got myself 4 sets to play with while i waited for James to offer me a set of AD8610 (loved the AD8620 on the XM4).
AD711 has a stranger meager sound.
NE5534 sounded clear enough to give them a second longer audition, after a few hours ~10-12 with them i find them bright and clear, but nothing "wow".
Last was the OA227, kind of a "try another OPA before wasting money on a OPA627", and well, the chip is nice enough that i will order the OPA627 after i get the AD8610 set from Practical Devices on their WhiteCaT, and *hopefully* together with a pair of AD8065 (if James is willing to put them up, i asked, now he just needs enough people wanting them i think?).
How the OPA227 sounds for me to say nice enough? You may have noticed a pattern of "nice and bright" not so with the OPA227, first impression was strong strings, (piano, cello, guitar) but veiled vocals, not sure why, i forced myself to close the amp up and take it to work.
Got used to the sound but decided to play with BBE on my D2, and sure liked that, after a while of listening i thought it was time to turn off BBE (BBE: 2 and M3B:2 for those of you with a D2), i was baffled when i realized i had fooled myself, the spacious sound did not come from BBE and the bass did not come from M3B, i had long turned it off, so yeah long story short, i enjoy this sound so much that i HAVE TO hear a OPA627 pair, since everyone seems to say they are so much brighter and detailed.
The phones i used at work are Phonak Audeo PFE, at home i use my AD700, and spacious is not something that would usually come to mind between an IEM and a set of open phones. just in case you wonder what pair i had on their.
I quick tested all 4 pairs with and without BUF634 and chose to only "long test" combinations of opamps with BUF634 in place.
The NE5534 may not see a long test after the medium long test was bright and clear but uninspiring, it never fooled me into thinking i had BBE on ;P
AD711 is out, and if i can make myself let go of the OPA227, the LM6171 sounded like it deserves a long test.
Just my 78 cents (i never could keep it short and add 2 cents when i get excited)
Daniel