Is my amp the problem?

One thing one thing to mention ,the amplifier is nothing special to begin within 
for sure invest in a known product such as Wyred 4 sound  ,Pass labs 1st watt
evrn Nad ,or tons of other proven companies.
iwith your speakers  who built them and how to know if  they knew about proper 
speaker building Xovers very important and not easy to get right .usjng a online 
computer program Essential . I have bought from little companies before I won't name ,that had no clue ,no matter what cable or amp,preamp upgrade 
it was not seamless I tried my own Xover upgrading since I have modded caps, resistors,inductors  for years f the design is flawed yiu can hear it .
with the price of new Elac products ,and evrn lower priced excellent JL audio 
subs for under $1k  you can build a great starter system for under $2-3 k for Everything including digital and cables. Just advise I have had single drivers
and passive is not always so a inductor  or resistors change the driver in some fashion.seek local Audiophiles  many would love to help including myself .
where are you located? Myself New England.If you don't know Ask I have been doing this for 40 years and still learning . No one  knows everything !!

Uh- all good suggestions, but before you do anything else, check to see that the woofers are in phase.

That is to say, if the red connection on the back of the amp is connected to the plus terminal of the speaker, that such is also the case with the other channel. This way both speakers are pushing and pulling in unison. Otherwise they are fighting each other, and you would have some pretty 'blah' bass!

will definitely speak with Dan. Also, i just bought a used parasound amp and I will see if that helps. Also a buddy is lending me an active XO to try.
Thanks again.

atmosphere I did confirm polarity is correct.

@jimbones - which Parasound did you buy?  Which active crossover does your buddy have?  Just call me curious.