The purpose of this post is to take a look at cables that can be used as component cables from the point of view of bandwidth. A discussion of this will also include some additional bandwidth comments regarding associated devices. Often the topic of what component cable should I buy is asked. The likely responses will be brands or particular vendors. I find this information generally useless and while everyone may indeed be correct, it doesn't address the fundamental question of what are the requirements needed to successfully pass a signal from one area to another such that it can be effectively used. Note that this does not mean which cable has the least amount of attenuation. While buying such a cable in not a bad thing, often in cases where the lengths are very nominal, a few meters, it's completely unnecessary and results in a gross overspecification that doesn't result in a visible difference. In the situations where there may be a visible difference such as in long lengths, often a slight adjustment on the display device restores everything to the original level of acceptability. When that's done, no visible difference is seen. We've all seen TV's in stores and it's nothing short of amazing how different many brands can look. Too much red, not sharp enough, contrast is off, etc. Most of us go to the trouble of adjusting our sets using calibration disks to provide references and targets. Some even go so far as to enlist the services of a calibration professional. It's quite reasonable to expect that given a long length of cable one may have to adjust their TV sets. If you find this disturbing then just buy the widest bandwidth, heaviest shielded cable you can. Personally, periodic calibration after making changes I consider just the way things are. In the scientific fields it's Standard Operating Practice and given that the differences are generally small, no one makes a big thing about it. However, audio, if nothing, is about raising trivialities to the level capital offences. Bandwidth is generally defined as the point at which a signal of a particular frequency is down 3 dB. Being down 3 dB means that we've lost 1/2 of our signal. Generally, but not always, this is taken at a distance of 100 feet. Hence, when a vendor specifies this, it'll generally read something like "bandwidth of 750 MHz @100 feet". When a vendor doesn't specifiy bandwidth but instead specifies just the number you're at a loss as to what they really mean. You should contact the vendor to get clarification. So what are the problems associated with insufficient bandwidth? Well if the signal you're pushing through has a bandwidth of 5 MHz and some device in the middle has a bandwidth of 2 MHz, then most certainly that device will severely attenuate or chop out the signal above 3 MHz. You'll be losing information that may well not be compensated for by adjusting controls on the TV. Fine detail will be severely compromised. Kind of like clipping if you will. Receivers or other processing devices that allow video switching should have a bandwidth specification. Depending upon what's plugged into the device, the bandwidth may be adequate, marginal, or simply deficient. I take the manufacturer's specification to mean that it will attenuate the value by 3 dB. Various values that I've seen here are 50, 100, 200 MHz and there are no doubt others. So what bandwidth is necessary in order to pass these signals? Our eminently capable Bob McElfresh has posted the following information before.