Kenwood DEM-999D (c. 1997)

The Kenwood DEM-999D is a small, dedicated AC-3 RF demodulator. It sits between a Dolby Digital LaserDisc player and an AC-3-capable receiver or decoder, and converts the raw RF signal from the LD player's AC-3 RF output into a standard coaxial digital signal. It was released around 1997 as an option for Kenwood's KR-V999D and KR-V888D receivers, and you needed it to get Dolby Digital surround from a Dolby Digital LD player. The original Japanese price was ¥18,000.

It's a very compact unit - 89mm wide, 35mm high, and 101mm deep, weighing just 0.2kg. It takes DC 12V from an external power supply, and both the RF input and coaxial output terminals are gold-plated. The LaserDisc Database lists the output as "1c out," which appears to mean a single coaxial output, though that's the source's exact phrasing. The Manualzz documentation confirms how it works: with the power switch on and an AC-3 RF signal fed into the RF input jack, the unit outputs AC-3 coaxial digital signals. It's also described as having a large LCD display showing status and settings.

Documentation on this model is thin beyond the basics. No frequency response, THD, or S/N figures are recorded in the sources we have, and production years beyond the circa-1997 estimate aren't confirmed. The manual's specifications section exists, but its contents weren't captured in our research. The record does show that without this box, the KR-V999D and KR-V888D couldn't decode the AC-3 RF signal from an LD player.

Collector interest is real but sparse. A LaserDisc Database forum member described buying one with its original power supply specifically to make precise measurements and find a compatible spare part to modify a 12V 500mA converter with the correct adapter. That hints the original power supply is a known weak point, or at least something people want to replace carefully. A Russian listing called it "a rare component for systems based on LaserDisc players," and one eBay bundle - including the LD player, remote, demodulator, and nine movies - was listed at US $999 in "perfect mint condition," fully tested and working.

Known specs, such as they are: