Check the listing for details. Eagle Comtronics EMN Series Single Channel Negative Filter Filters Trap. Color: Silver, Condition: New. Listed at 9.95 USD. NessElectronics, Since 1964 Eagle Comtronics EMN Series Single Channel Filters/Traps EMN Series Negative Filter A negative filter is a passive device that removes a video signal from entering a non-subscribing cable customer's home. It is the most effective and economical method of pay television security in the world. The filter attenuates the video carrier of the specified channel to a point where there is no viewable picture on the television set. Negative filters are installed at the subscriber outlet of the distribution tap or within lock boxes for multiple dwelling units. Every product Eagle manufactures is tested to the highest standard throughout production, so you consistently receive the best quality filter available in the industry. We have a selection of new "old" stock single channel filters by Eagle Comtronics. All filters are new and will ship bulk, not in blister packaging. Please message with any questions. Feedback policy: We will give you positive feedback as soon as we process your order. You have done your part, now it is up to us to earn your positive feedback and 5 star DSR ratings. If you have questions or problems with your product once it arrives, please call us before leaving negative or neutral feedback to allow us the chance to correct any issues you may have.