Flat speaker sound/preamp the culprit?/external EQ needed?


Hi, I have a Rogue Audio tube amp, which I love, a U-Turn turntable and an NAD phono preamp. Here's my issue: on many recordings the bass can really drown out the rest of the record. In general things sound muddy. When I plug my iPhone directly into the amp, I dont have this problem. So I think the premp is the culprit. (It has no EQ controls.) Can someone recommend a reasonably priced solution to this? An external EQ? Something else? (Someone recommended a Schiit Loki.) Many thanks in advance!
ineedhelpwithcables
Well done russ69. Sometimes it’s the least obvious or simplest of errors.

as for speaker placement, if that was the issue, wouldnt i hear it when i play the iphone too?
Not necessarily if it was an acoustic feedback or turntable-based issue.
Rogue Audio Tempest is a integrated Amp have you tried the phono input without phono pre amp it will run a MM 
"...Rogue Audio Tempest is a integrated Amp have you tried the phono input without phono pre amp it will run a MM..."

Good call, it's always worth trying, you might like one better than the other.