DIY Resonators - These resonators were made by me. The are made out of copper piping and cones. They are a much less costly alternative to the resonators made by the "big boys."
Place one on the front wall between your speakers and two on the front wall near each corner of your room. They work wonders in my listening room by expanding the soundstage, adding more depth to the sound, clarifying high frequencies and improve low frequency extension.
****MY PRICE: $75 FOR 5 RESONATORS INCLUDING SHIPPING in the 48 states.****
This is half the price of the cheapest resonator I have found on the market!
I also have two sizes of bronze bowl resonators with a wall mount. These are recommended for use with the center resonator mounted on the wall between your speakers. (See picture - $100 per 8.5" bronze bowl or $75 per 6.5" bronze bowl)
Adding more resonators to your listening room further enhances the acoustic effect. Do your research then buy this low cost alternative!
Fine Print: The resonators attach to your wall with blu-tack or poster board putty. You will need to supply your own putty. Also, I AM NOT GUARANTEEING THAT YOU WILL HEAR A DIFFERENCE IN YOUR ROOM. NO REFUNDS. All I can tell you is they made a huge difference in my room! I am rating these 8/10 because they are DIY - they are not perfect - some of them may have rough edges or may not be as shiny as others, for instance.