[tech12volt]

This is the only sundown audio 50 by 4 that exist. Its the same size as the 1000d and works perfectly. I used it for about 2 weeks . 350 shipped to your door. Its in perfect shape and will carry full warranty.

http://www.soundsolutionsaudio.com/forum/index.php?showtopic=7530

 

[sundownz]

This is indeed the only one made to date.