BEC Posted March 28, 2008 Share Posted March 28, 2008 Just hooked one up for some listening. Bob Crites Quote Link to comment Share on other sites More sharing options...
Spongeworthy Posted March 28, 2008 Share Posted March 28, 2008 Awesome, another Crown thread. Just what I was hoping for this weekend. [|-)] No offense Bob. [] Quote Link to comment Share on other sites More sharing options...
Daddy Dee Posted March 28, 2008 Share Posted March 28, 2008 What system do you have set up with the Crowns? Quote Link to comment Share on other sites More sharing options...
jacksonbart Posted March 28, 2008 Share Posted March 28, 2008 Top Notch, hope you enjoy them. Quote Link to comment Share on other sites More sharing options...
jwc Posted March 28, 2008 Share Posted March 28, 2008 Good. Maybe we can stop the focus on the last thread.[<)] jc Quote Link to comment Share on other sites More sharing options...
BEC Posted March 28, 2008 Author Share Posted March 28, 2008 Dee, The Crown is driving my original Cornscalas. Bob Quote Link to comment Share on other sites More sharing options...
BEC Posted March 28, 2008 Author Share Posted March 28, 2008 OK first report on the sound. With the room as quiet as I could reasonably get it, did some ear up to the speakers listening for noise. I could hear a bit of noise out of one channel of tweeters, but not the other. That is with the ear right up inside the tweeter horn. I could not hear it 3 inches away. My son Michael is younger and has more sensitive ears than I. He could hear the noise at 3 inches from one tweeter and around a foot from the other tweeter. Neither of us could hear any noise at a normal listening distance. Next we heated the amp up playing about 30 minutes of tunes at "pretty loud" volume. Then repeating the listening for noise test, results were the same. Fan in the amp was on for a couple of minutes after that 30 minutes of relatively high power performance. The Cornscala has the tweeter attenuated 3 db like a Cornwall. With a Khorn or Lascala which does not attenuate the tweeter at all, you would expect to hear a bit more noise. By the way, this was all with DSP off. Just using it as an amp. Bob Crites Quote Link to comment Share on other sites More sharing options...
SWL Posted March 28, 2008 Share Posted March 28, 2008 Bob..........What preamp are you using with the XTI ? Quote Link to comment Share on other sites More sharing options...
BEC Posted March 28, 2008 Author Share Posted March 28, 2008 No preamp. Driving it directly from my Macintosh Pro computer. Bob Quote Link to comment Share on other sites More sharing options...
SWL Posted March 29, 2008 Share Posted March 29, 2008 Cool.[Y] Quote Link to comment Share on other sites More sharing options...
Daddy Dee Posted March 29, 2008 Share Posted March 29, 2008 Bob, What amps have you been using lately to drive the CornScalas? Any impressions on sound with the Xti? Quote Link to comment Share on other sites More sharing options...
BEC Posted March 29, 2008 Author Share Posted March 29, 2008 Dee, Lately I have been using the old Sony amp you have heard lots of times here in the shop. Sometimes another amp is in place according to what is going on around here. We are rebuilding the shop now so things are in a rather strange configuration as everything gets moved around during the rebuild. Not to happy with where the Cornscalas have to sit right at the moment and they are certainly not in the optimum listening place. Listening last night with the Crown was pretty good. I still haven't made it through all my reference music, but so far the Crown is doing well. I will report more later. Bob Quote Link to comment Share on other sites More sharing options...
NOSValves Posted March 29, 2008 Share Posted March 29, 2008 Dean.....You reading this..........total vindication [] Craig Quote Link to comment Share on other sites More sharing options...
BEC Posted March 29, 2008 Author Share Posted March 29, 2008 OK, time to see what the test equipment says. Bob Crites Quote Link to comment Share on other sites More sharing options...
BEC Posted March 29, 2008 Author Share Posted March 29, 2008 Wll be using an HP3325A Synthesizer/Function Generator, HP35665A Dynamic Signal Analyzer (spectrum analyzer), and HP7550A Graphics Plotter. Crown under test is the XTi 1000 SN 8001432333 Bob Crites Quote Link to comment Share on other sites More sharing options...
BEC Posted March 29, 2008 Author Share Posted March 29, 2008 First test is plain old frequency response. Input was swept 20 hz to 25khz at 500 mv. Output was set to 1 watt into 8 ohms. Pretty good plot, probablly plus or minus 1 db up to over 23 khz. Bob Crites Quote Link to comment Share on other sites More sharing options...
BEC Posted March 29, 2008 Author Share Posted March 29, 2008 Second test all the same except at 10 watts. Bob Crites Quote Link to comment Share on other sites More sharing options...
BEC Posted March 29, 2008 Author Share Posted March 29, 2008 Now we will look at harmonics. Input is 1khz at 500 mv. Output is 1 watt into 8 ohms. Harmonics and noise are around 75 db below 1 watt. Bob Quote Link to comment Share on other sites More sharing options...
BEC Posted March 29, 2008 Author Share Posted March 29, 2008 Same test at 10 watts. Harmonics and noise at around 80 db below 10 watts. Bob Quote Link to comment Share on other sites More sharing options...
BEC Posted March 29, 2008 Author Share Posted March 29, 2008 Just for fun, since there is a preset in this crown for the Jub at 48db slope. Thought I might trace it. Green trace is LF and red is HF. Cursor is at 512 hz. Input was 0 to 25 khz swept at 500 mv. Output was at approximately one watt. Bob Crites Quote Link to comment Share on other sites More sharing options...
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