Pair of 3-way speakers MODIFIED. Audio Pro custom design. (2) New upgrade 3/4 dome (silver flute) tweeters. (2) Marantz 2" dome (vintage) midranges. (2) Matched professionally refoamed original Infinity 4001 woofers. Extensive rework mid circuit . Improved low-frequency filters. Custom cabinet damping and felt cone. Dampeners for improved deep bass.