Originally Posted by zilch0md
Has anyone tried using LME49990 as buffers, with LME49990 in I/V (in the PB2, for example)?
I'm currently using dummy buffers with the LME49990 because every opamp I try as a buffer with LME49990 in I/V only diminishes clarity, even if it does improve headroom/dynamics (as with the HA5004).
This time around, was listening to Track Title : Lo Que Yo Más Quiero by Son By Four (2001)
Using AD-700 headphones and my old standard Prodigy HD2 (for testing), with all empty sockets, the sounds are distant. With the stock OPA 2604AP and buffer/output empty, the sound is tinny in the highs, favors some lows, not very realistic (crap). Adding L49990MA in the output, it enhances whatever the 2604 sends it and brings all the sounds forward with a bit of detail resulting in higher quality crap sounds.
Tried the AD797BR with the output empty, favors the lows and mids, some very high end missing but clean detailed sounds throughout. Adding the L49990MA in the output, takes and clarifies the entire range and bring all sound forwards. Good clean fun.
Tried the NE5532N with the output empty. Clear and clean with no artificial enhancements, making all sounds equal across the ranges. Added the L49990MA in the output and resulted in excellent sounds. The entire range sounded true with clear highlights, good separation and clarity. Highs were crisp. Lows and mids were true. Lows did not outright pound but sound clean nonetheless.
I could easily live with NE5532N(s) and the L49990MA in the output socket. Rivals all my past configurations when considering all around realistic sounds. Very enjoyable.
The tried and true NE5532N are only a couple bucks anymore. If you can only afford (1) adapter board with the two L49990MA on it then I would use it in the output along with your favorite op-amps in the I/V sockets.
Your mileage may vary.
(I will note that I couldn't get (3) adapted L49990MA to work on the card at once in all three sockets, not sure why but doesn't seem to be necessary.)
Edited by razzz42 - 8/5/13 at 6:44pm