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Old 4th March 2011, 06:56 PM   #1
Ted205 is offline Ted205  United Kingdom
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Default A warmer buffer

Hi guys i'm currently using a LM4562 opamp as a buffer(bridging circuit) in-front of a bridged lm3886 setup.

When playing various classical and electronic style music its sounding very crystal, clean and expansive. However when playing rock music it can be quite fatiguing / clinical.

Can anyone recommend any opamps similar in spec to the lm4562 a bit softer with abit more warmth i can try.
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Old 4th March 2011, 07:42 PM   #2
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Tubes are warm
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Old 5th March 2011, 10:04 AM   #3
Ted205 is offline Ted205  United Kingdom
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but will not fit in a dil socket
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Old 5th March 2011, 10:36 AM   #4
AndrewT is offline AndrewT  Scotland
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I wrapped some loft insulation around my pre-amp.
The resulting sound quality did not last long, but while it was still able to play, I think I noticed it a bit warmer !
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Old 5th March 2011, 02:49 PM   #5
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I think you know that I was being a bit of a jokester.
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Old 5th March 2011, 09:18 PM   #6
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OPA627 (you have to use a single to dual adaptor for this) is probably the warmth champion. Clean and silky smooth. It has a friendly and cozy coloration. This is an expensive opamp.

OPA2132 and OPA2134 also have that warm Burr-Brown sound, but I find them lacking soundstage and details. A bit harsh treble.

NE5532 is warmer than LM4562. I find it smooth and warm but lifeless. Beware of high bias currents resulting in DC-offset if your amp is not capacitor coupled or the bias currents are balanced out.

AD8599 isn't far from LM4562. A little warmer and "friendlier", a little less detailed. Quite good.

LM6172 is called analytical by many. I find it warm. This is a high speed opamp with high bias currents and the role model for cranky opamps.

Search here and at Head-fi.org and you'll find lots of reviews. We all tend to disagree on how they sound, and some people think it's imagination and they all sound the same.

Have you ever tried LM3886 without input buffer?

Why not use a discrete JFET buffer like Nelson Pass's B1?
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Old 6th March 2011, 11:29 AM   #7
Ted205 is offline Ted205  United Kingdom
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thanks for the reply nelsonvandel.

I have thought the b1 buffer but i'm using my current buffer to invert one signal ready for the bridged power amp section
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Old 7th March 2011, 02:03 PM   #8
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There is something you might try before replacing the opamps that shouldn't cost you anything. I recently pulled my feedback resistor from the board and soldered it directly on the chip legs a la Peter Daniels style. It seemed to take some of the high frequency edge off without affecting the clarity at all.
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Old 7th March 2011, 06:31 PM   #9
ide2003 is offline ide2003  Indonesia
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5676.jpg

not quite a dil but close enough , found somewhere on the net PRIDEDIYJUNK
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Old 7th March 2011, 07:18 PM   #10
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Is that a nuvistor?
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