Well, Acoustic Fields and Vicoustic sell superior quality and higher cost quadradic diffusion as well as other acoustic treatments. The HFT on the back of my Legacy Focus has to be placed between the two upper ports and the lower subwoofer driver. It is less critical, about an inch up or down to adjust to the room. The HFTs on the side walls, rear wall and corner front walls are also less critical in my room.
I was thinking about trying SR GCTs and UEF Cable Risers next. I found the SR Blackbox sucked the life out of recordings by cutting off frequencies above 8Khz. The UEF Cable Riser demo may indicate a similar effect using a type of ECT on each riser, or they may just focus the sound better. The Atmosphere XL4 is more of a toy and the default is mostly not better than no Atmosphere XL4 at all.
I use the former Perfect Path Omega E- and E+ Mats, E+Cards and Stop-Its to great effect (waiting to add a mini-gate). They do electrically what the Black Box is supposed to do mechanically/acoustically, diminish distortion.
Upgrading my A/C cables to GroverHuffman Pharoahs made the biggest difference to my DAC, Transport, Turntable motor and controller. I already had the Pharoahs on my Bryston BIT-20 isolation transformer, amps and pre-amp/phono since I moved into my custom listening room.
I was thinking about trying SR GCTs and UEF Cable Risers next. I found the SR Blackbox sucked the life out of recordings by cutting off frequencies above 8Khz. The UEF Cable Riser demo may indicate a similar effect using a type of ECT on each riser, or they may just focus the sound better. The Atmosphere XL4 is more of a toy and the default is mostly not better than no Atmosphere XL4 at all.
I use the former Perfect Path Omega E- and E+ Mats, E+Cards and Stop-Its to great effect (waiting to add a mini-gate). They do electrically what the Black Box is supposed to do mechanically/acoustically, diminish distortion.
Upgrading my A/C cables to GroverHuffman Pharoahs made the biggest difference to my DAC, Transport, Turntable motor and controller. I already had the Pharoahs on my Bryston BIT-20 isolation transformer, amps and pre-amp/phono since I moved into my custom listening room.