New preamp, loss of low freq.?


Hooked up new preamp, and I lost what I think is some low freq slam. Reasoning behind this?
i have been rewarded with the best cleanest, accurate midrange/highs I have ever heard, but did lose some low frequencies.      Normal?  

Sanders preamplifier is the new addition. 

Should i I hook up my equalizer to  smooth out, and add some low freq. 

it it is recording dependent, I still feel I lost some bass when sanders is in the mix. 

Not complaining, this has completely opened up my energy rc-70's, I have never heard these sound so loud, so clear before.   It's I feel I lost a few octaves in the lower register. 

Better? Leave it, I can definitely get used to this sound, as before it was a small bit boomy, maybe I just need time to adjust, and to let the pre warm up for a couple weeks. 

thoughts, recommendations, tweaks? I suppose I could move the speakers a little closer to the wall, this may add a little more bass. 
128x128arcticdeth
You were running out the 1/8" headphone jack?

Yes, the connector bypasses that and the sound should be a lot better, no duh!
I suspect that the sound that you are used to hearing has changed.   Perhaps the new equipment has better sound ...which doesn't mean it doesn't have good bass...just less pronounced than your previous one.  I would live with it for awhile to let my ears become accustomed to the new sound.  If you suspect its broken, send it back to whomever you got it from.   Personally, all my equipment is from the same manufacturer, so the oft change of incompatability, is never in question.
Why on earth do people try to mix and match these pieces when highly skilled designers have done the work for you? it seems its just for the hobby of it.  Wouldn't the smart thing be to match the preamp and amp by brand? I'm a newbie so this is a real question.