You have great little speakers.
I would first concentrate on the amp before I would consider a subwoofer. With a good, powerful amp, you will be amazed at the bass output. Being a "Krell man", I would probably look at a used Krell. Maybe the KSA200S. It will give you that punch you are looking for to "move you".
If I am wrong, you can sell the Krell a get what you paid for and be out little or nothing.
Richard
I would first concentrate on the amp before I would consider a subwoofer. With a good, powerful amp, you will be amazed at the bass output. Being a "Krell man", I would probably look at a used Krell. Maybe the KSA200S. It will give you that punch you are looking for to "move you".
If I am wrong, you can sell the Krell a get what you paid for and be out little or nothing.
Richard