Should I be able to hear a 4Hz difference in my speakers?

I used to own all Totem speakers for all my different rooms. The difference between the Forest and the Hawks were mainly In the lower frequency range, Forest produced a more full sound. But with every Totem speaker I had except for the Arros, you needed a powerful amp. To get the best sound from my Mani II’s, I used the 1000 watt McIntosh monoblocks. For the Model 1’s, I used a 250 watt Classe amp. For both the Forest or Hawks, I would go with at least an equivalent 250 watt Amp like from Classe, Pass, McIntosh, and the Odyssey monoblocks. I had used all of those amps with Totem speakers with good results. I had the McIntosh ma6500 integrated for a while and it didn’t provide the power that either the Mani’s or model 1’s needed, that’s when I switched to monoblocks and separates.
Speaker positioning is also important in your room. Totem makes a really good speaker that produces full range sound from a smaller speaker. 

@rbstehno , were the Mani 2’s the strongest in the bass regions?

I’ve been enjoying my Arros but want a cleaner top end, fuller bass and the ability to play louder.  I’m liking my Arros so much that I’ve considered Hawks as my next speaker; do you think they’d offer me what I’m looking for?

Depending on your amp, one pair may be easier to drive than the other over those low frequencies...leading to an audible difference  I believe the Forest Signature are an easier load than the Hawks at less than 100 Hz but I'm not certain.  What amp are you using?  If it's high powered SS then this may be a moot point.

Sigh....

Hopefully you're enjoying the music.

The truth is, few can, no matter the claim. John Atkinson's measurements routinely reveal that fact.

devialet phantom can do below 20hz and kii audio can rattle your windows.