**Warning! Do NOT click on the link above. It is Ransomware, or possibly a fake ransomware virus. Fortunately I have robust Anti-virus software so no Ransomware was able to deploy on my system. JA Please ban this member and remove thread!

I didn't click on the link, but generally, I'd first make sure that you're speakers are in phase. Assuming they are, there will always be areas of a room where bass is heavy and areas where bass is light due to standing waves. If your listening position happens to be in a position where a null is created then you have little bass. I'm not an expert on room acoustics, but repositioning your speakers or your listening position, or both, might be in order.

You can easily measure your room and frequency response with a frequency generator, like JA's test cd and an inexpensive spl meter.

Would loved to find out also but got suddenly got scared, but anyway i'm no expert and also has basic knowledge, here are my thoughts if you have a big room it can possibly the bass sound will reduce and the sound will be different in any direction, I have a small setup in here which I plan to upgrade soon and since I position it in 1 way direction it's pretty loud but in different direction it's a bit disturb, you might want to consider adjusting you setup and find out what's the best for it, there might be space / void preventing for the bass to be heard so adjusting the position is the best way to find it out.

You happen to be sitting right in the middle of a standing wave.

I just sold a very hi-end pair of speakers because all the advice I got was to buy either 2 or 4 subs to counter affect the null. I instead sold them and bought a pair of rear ported speakers, the previous were ported thru the bottom, that I could move enough to get solid reinforcement without smearing. Usually the null only happens in one spot so you might put the speakers along a different wall?

It is likely that there are nulls at more than one spot although the only one or ones that matter are those at the speaker position or the listener's position.

Repositioning the speakers and/or the listening position is the only solution. Adding subs only works if (1) they are not in a null position, (2) if they cover the frequency of the null and (3) if you are not sitting in a null. Changing the main speakers works only if it gets you the option to move them out of the null.