The Swans are made by HiVi Research or one of their subsidiaries. I had them for four months before sending them to Danny Boy. He kept them for almost three months till he got them dialed in. I believe the Modwright Swans to be up there with any $5-6K pair of monitors.
After the mod, the speaker's efficiency increased by about 2 dB, bass went down (-3 dB) to 40-45 Hz >>> stunning for a 4" woofer! The midrange weirdness the stock Swans have was completely gone after the mod and the Bybees do help with smoothness. It is an amazing little speaker and I have no need to upgrade. The Modwright Swans is extremely revealling and musical loudspeaker yet it is not ruthlessly revealling like, for example, the B & W and their look alikes. It is non fatiguing and they can successfully play any kind of music: classical, alternative rock, jazz, acoustic music, salsa, you name it...