Bass traps?

[kramer2020]

Hi all, I would like to do some furtive 😎 room treatment in 'my' listening room and I'm thinking of some free standing bass traps behind my speakers. What do you think of these?

Bluetone Acoustics Tube BassTrap - Premium bastrap - Akoestisch paneel (Silver) : Amazon.co.uk: Musical Instruments & DJ

 

[Gray]

What do you think of these?

Expensive, was my first reaction - not that I've done any price comparisons.

 

[Nico69]

The look like they are too small to make much difference. Looking online at what people install in rooms they seem to be about 4x bigger than those. FWIW get a couple of duvets and loosely roll them up and shove then in the corner. You'll get an idea if they make a difference.