DIY acoustic panels?

I am not sure about the bass traps. They might be overkill for the stage I am at.

i have been looking at the new PB Ultra subwoofers from SV Sound, however, and they claim dual subs can help smooth out the bass frequency  responses.

https://www.svsound.com/pages/16-ultra-series
https://m.youtube.com/watch?v=OXVpy5jaNsk

another thing about Roxul 80.  They are extremely heavy when compared to Owens 703.  (almost 3 times as heavy).  So if you are mounting on the wall, it may be better to get the lighter 3lb stuff like Owens 703.  However, the Roxul 80 will have better absorption in midbass (such as 100-150hz).

Here is a good https://www.fabricacousticpanels.com/acoustic-absorption-panels/ Adding a combination of acoustic sound absorbing wall panels, sound baffles, or both the two will produce significant differences in speech intelligibility and sound quality. Our echo absorber acoustic panel and baffles can be made in unique range of fabric color and material to suit your needs.

Do check out the wood wool acoustic panel at panelsforwalls. These acoustic wall panels offer significance noise reduction and have high heat resistance capacity and moreover, it's made of natural components. NRC of the panel is the on the higher side so that it's ideal for acoustic and soundproof activities.They offer a wide variety of panels such as  Acoustic wall art panels, designer tiles like Wood wool hexagon wall tiles etc.

Try this one. www.panelsforwalls.com/wood-wool-acoustic-panel/">wood