I especially like my bookshelf diffuser.
My stereo cost me 0$, speakers and all.
All sound is handed down or leftovers when others bought other stuff, the stuff was dusting about until I took use of it.
This is my HTPC, PC & Stereo corner.
I use 4 speakers for my 2channel stereo.
Why? The small top one is for middle and highs. The towers are for middle and lower frequencies. One tweeter was busted so I disconnected it on both and used the bookshelf for the highs instead. They are actually wall mountable.
Works OK. Actually sound is horrible each on their own, when combined they beat the single pairs by lengths.
I have 2 other pairs of working 3-ways but this 4speaker 2channel getup sounds better than those. I tried many combos. This was best whit what I had available.
Decent sound on a super cheap budget.
A close up on the towers. The wall-mountable bookshelf is labelled "Picture 13"