I have two Superclock 4s here for sale. The 27mhz one works in universal players and DVD players and the 24.576mhz one works as the main clock in a Behringer xover and probably a few players. The 27mhz clock has a few hours on it and the 24mhz one is brand new, never used. $150 each. This is essentially half price. These clocks can make a nice upgrade. We have developed our own superior clocking, hence we don't need these clocks. Our clock is not available for DIY and costs $275 installed.