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Pro-ject tube box DS sounds mushy in the middle

I have a stock Tube Box DS which I bought used and the mid-range seems muted and the highs not very crisp. Classical records sound pretty good, opera as well. Pop and rock just seem lifeless. Would replacement tubes make much difference. I prefer brighter sound. Phono not nearly as bright as digital feeds from CD. Using good DAC with optical input.
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tro54's avatar
tro54 OP
2 posts
 
Thanks. I discovered the problem, the F/V jumpers were installed which killed serious dynamic range. I removed them and the subsonic jumpers as well and it's like a cloud lifted. Great high end, punchy bass and bright mids.. 
Dumb operator-me.

tro54's avatar
tro54 OP
2 posts
 
Using Ortofon 2M Black so no jumpers needed except for 40db.

noromance's avatar
noromance
1,780 posts
 
Good. RTFM. ;-)
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