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

Showing 5 responses by ineedhelpwithcables

Thanks all. The turntable and cartridge are barely six months old. My instinct based on this is that I need a better premp. Any recommendations? This is what I have currently:
https://www.amazon.com/dp/B00IFMM7TC/ref=cm_sw_r_em_apip_tmPJ3BO59OKfL
So this did it! I switched the preamp to MM and the muddiness went away. I looked up Uturn's website and all their cartridges are MM. 

Thank you all!

I would still be interested in preamp recommendations where you can adjust the bass, if such things exist.  Would the Schiit Loki do that? 
thanks for the comments all. i plugged the preamp into the aux input instead of phono and that has not made a difference. in response to one question, the only volume control is on the amp, not the preamp. 
if the problem is the low-cost preamp, does anyone have recommendations for a diff one? 
as for speaker placement, if that was the issue, wouldnt i hear it when i play the iphone too?