Abex: After looking at the design for the Hagerman, i would not waste my money on such a device. For that matter, i would not waste my money on most of the other burners on the market either.
A person would be better off looking on Ebay for an old Heathkit, Leader, Eico, etc... Sine / Square wave generator. You can typically pick one of these up for appr $15 - $50 dollars for a complete unit. Using something like this and building some simple terminating loads ( female RCA's that you solder 10,000 ohm resistors across ) that you can plug your interconnects into will get you most everything that you need for an "interconnect burner". To top it off, you can vary the center frequency of the signal using one of these devices, allowing it to work even better than some of the fancy "audiophile approved" burners that cost quite a bit of money.
As far as the type of signal to use, a sine wave or limited bandwidth noise will not work anywhere near as well as a square wave at high amplitude. The reason for this is that a square wave is basically a massively distorted sine wave that is going into "hard clipping". Due to the clipping, harmonics are generated 10 - 15 times above the center frequency. As such, a square wave not only exposes the cable to a higher intensity signal at the center frequency, but a signal that has multiple frequencies rather than just the one that you would get with a sine wave.
This is the reason that "clipping" an amplifier, which is common on high impact or long duration bass notes, tends to blow out mids and tweeters. The added power and longer duration harmonic overtones that are a by-product of the clipped low frequency signals result in a greater amount of signal being fed to the mids and tweeters than what they would normally see or have to cope with. In many cases, this is enough to over-heat the voice coils in the small and fragile drivers and burn them out.
By using a square wave to "cook" the cable, you expose the cable to both a more intense, longer duration signal and a signal that is wider in bandwidth. You also have to get the voltage up to something that is well above what the interconnect would normally see at line level, which is .75 - 2 volts for home audio. As such, look for a cheap but usable sine / square wave generator that can do at least 8 - 12 volts peak to peak and you'll be good. My Mil-spec Wavetek generator will do 36 volts p-p on square waves but also costs quite a bit more than the aforementioned Heath, Leader and Eico models. Sean
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