I replaced inexpensive AQ Indigo with AZ Satori (Shotgun) with great results. Satori keeps bass very tight but adds a little to lower midrange that sounded thin with Indigo and class D amp.
It added "body" to instruments and "chestiness" to male voices. I also noticed that voices are silkier/cleaner and percussion instruments are snappier. Soundstaging got a little better. It sounds good in combination with AZ Absolute 0.5m XLR interconnect (silver), but my speakers have soft dome tweeters and are very warm sounding.