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In Reply to: RE: My cheap Sony beat out my Marantz. Go figure. posted by AbeCollins on January 17, 2017 at 17:19:42
I found the same thing with my PM8004. The top end would drive me nuts!!!
What I finally ended up doing was cranking up the treble 100% and the midrange up a few notches. Helped but didn't cure the problem. I'm baffled that they voiced this amp like this.
Look inside. They used all very high quality parts. SO whazz up?
Follow Ups:
Not all the parts are high quality inside the PM8004. There's a bunch of el cheapo NJM2068 IC opamps used as buffers and in the preamp circuits. The 2068 is a decent opamp with low noise but it is a dated design known for dull sound. There are plenty of better and faster opamps out there that Marantz should be using in a $1K amplifier. I hope the newer PM8006 has them.
Edits: 03/28/21 03/28/21 03/28/21
It's not a bad amp but I was surprised that I liked the inexpensive Sony better. I cranked up the treble on my Marantz too which helped but having to do that always bugged me. I thought it was me being picky and something I would just get used to. And then I compared it to a couple other amps. Hmm.
I'm going to do some surgery on it this summer.
I already redid all the caps in the signal path. So I'm going to start looking into different value caps. I'll let you know what happens.
I have a feeling the problem lies in one of the feed back loops.
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