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Looper's Delight
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At 11:34 AM 10/29/98 -0600, Chuck Zwicky vitriolically wrote: >I have used both. The jamman sounds so much better it's shocking. The EDP >is very noisy. The EDP uses pre-emphasis/de-emphasis in their converter >topology, this means that any signals with a lot of high end, like from a >fuzzbox, will overload or alias like crazy. The EDP sounds subjectively >dull or cloudy compared to the jamman. If you have this problem, it means you have the input level set too high, and you are clipping the digital input. If you turn the input down a bit, the problem goes away. Every person I've every dealt with who had this complaint was happy after they knew how to set the input level right. Personally, I use the echoplex with drum loops containing lots of cymbals, and have no trouble with high end response at all. On older units, the problem was compounded by too much gain in the input, so it was a little difficult to set properly. Most of the range of the input volume knob was way too loud, and people tended to have it way too high. That gain range was reset some time ago, so it's much easier to work with now. This has been covered here numerous times, and is also in the echoplex FAQ on the website. If you have an older unit and want to change how the input gain works, that mod is also in the FAQ. >I really wish that they had done a better job with the EDP circuit board >layout, so that the fidelity was higher. The seem to use a decent >converter >in the EDP, but Lexicon has such a great design team when it comes to >digital audio.... I measured the Echoplex's audio characteristics on an Audio Precision meter. >From memory (sorry, I don't have the details with me...they all get ~): Signal-to-Noise Ratio (A-weighted): ~88dB Signal-to-Noise Ratio (unweighted): ~80dB Freq Response (+0/-3dB): 18Hz - 19.5KHz If you have the input signal too high, you definitely see the frequency response roll off in the high end. That's why it is important to set the input level correctly. I typically use the loudest signal with the most high end I expect to use (typically a crash cymbal, or a loud/clean skank guitar thing) in a loop to set the level to where it does not clip. kim ________________________________________________________ Kim Flint, MTS 408-752-9284 Chromatic Research kflint@chromatic.com http://www.chromatic.com