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Looper's Delight
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Kim, The circuit is so noisy that you really have to set the gain too close to the headroom limit, even with the input gain mod. -Chuck Zwicky At 01:11 PM 10/29/98 -0800, you wrote: >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 > > >