Captor makes several noise filters including EMI filters and telephone and signal line filters, which can be made to military grade specifications.  Their signal line filters pass band at <3 dB at 4kHz to <0.5 dB at 0-1kHz on VAC or VDC lines while their EMI filters offer several termination interfaces including threaded terminals, solder terminals, connectors (commercial, military grade, IEC, many more), and wire leads & harnesses.

Coilcraft makes many EMI/RFI filters including surface mount and leaded components, LC filters, and signal line filters, which work on RJ-45, RJ-15, and RJ-11 lines. Their LC filters include high and low pass models and feature less than 0.3 dB insertion loss with 50 or 75 Ohm characteristic impedance.

Corcom Products makes EMI/RFI filters including LC filters, Power Line filters, ISM filters, Signal Line filters, Power Entry modules, DC filters and facility filters. Their power entry modules have a current rating of 1 to 15 Amps, while their DC filters have a current rating of 1 to 125 Amps. Corcom filters can be used for microwave filtering as well as medical and military applications.

DJM Electronics makes several RFI/EMI filters including power line, facility, and signal line filters as well as custom filters, running on AC or DC lines. Their power line filters have a current rating of 10 to 250 Amps, while their standard facility filters have a rating of 2X5 amps to 4x300 amps.

Genisco makes EMI/RFI filters including signal line filters, power line filters, and facility filters as well as custom filters that can even be built to military specifications and cover a broad range of power and frequency requirements. Their Low pass signal line filters include a general communications filter which is dual circuit and have a maximum voltage rating of 100 VDC/30 VAC or 400 VDC/125 VAC and current rating of 0.5 or 1 amp.

LCR Electronics designs and manufactures EMI/RFI filters such as power entry filters, power line filters, signal line filters,  and facility filters. Their power entry filters have a max rated voltage of 250VAC with a rated current of 1-20A (filters) and 1-10A (modules) and an operating frequency of 50 or 60Hz. Applications include industrial three phase controllers, medical grade filters, microwave filtering, military spec filters, and appliances.

MTK Electronics makes noise filters including EMI/RFI filters, Signal Line filters, and power line filters. Their RFI/EMI filters are for 5 to 300 Amps with maximum voltage of 250AC/600DC and a power line frequency of 0-400Hz and can be built to military specifications.

Newmar Power makes noise filters including Signal Line filters, LC filters, RFI rilters, and DC filters, with models rated at 150 Amp., 10 Amp., and 25 Amp. designed to run on 6-48 VDC systems.

RFI Corp makes EMI/EMC/RFI noise filters including signal line filters, power line filters, facility filters, and component filters.  Their power line filters have a voltage range of 12 Vdc - 5500 Vac and a current rating of 0.01 - 5000 Amp. with a frequency of 50 - 400 Hz and attenuation of 120 db from 9KHz - 18GHz.  Medical grade and military spec models available.