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Post by edoetsch on Aug 13, 2018 13:39:00 GMT -7
Is there any sort of data like this? I want to know if I can run my KT safely on a Celestian Blue at any setting?
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Post by daddyelmis (Greg) on Aug 13, 2018 16:20:24 GMT -7
Somebody smarter than me will have to chime in, but I did find this site that appears to calculate the output power based on a given input power and a given increase or reduction of that input signal in dB. For example, if the signal going into the brake lite is 45 W (i.e. the KT-45 is maxed) and the brake lite is set to give 5 dB of attenuation (i.e. -5 dB), then the output signal is a little over 14 Watts based on this website. www.sengpielaudio.com/calculator-amplification.htmHere are the DB reductions for each click of the brake lite: drzamps.com/product/brake-lite-sa/Having said all that, I’d wait for somebody in Doc’s shop to answer this before I’d risk a $300 Blue.
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Post by GuitarZ on Aug 13, 2018 16:50:21 GMT -7
Hey Daddy Elmis! I went to school for this stuff. And, dang if I couldn't give a better answer than yours. (And, my father-in-law always asked me where i wasted my music lesson money rather than my college money. ) I'd go with the third setting (or greater) to take off -8 dB which would drop you down to 5 watts. The second setting of -5 dB would only drop you to 14.2 Watts. I always like to leave a little buffer since the wattage spec might be conservative. Thus, I'd personally go with the third setting of -8 dB. (The one easy calculation to remember is that a 3 dB drop will cut the power in half.) One other thing to keep in mind is how hot you run your amp. I basically take my Ghia and turn the volume on max. So, I can assume I'm near max wattage or so. If you don't do that, then you're taking some wattage off already before the attenuator. Other folks can pipe in since I'm sure some have used their Blues with Ghia's or Maz Jr's without attenuators.
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Post by daddyelmis (Greg) on Aug 13, 2018 17:38:40 GMT -7
Well, my undergrad is in mech engineering, so all I know about electrical stuff is “don’t let the smoke out.” 🤓
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Post by edoetsch on Aug 14, 2018 6:17:59 GMT -7
Somebody smarter than me will have to chime in, but I did find this site that appears to calculate the output power based on a given input power and a given increase or reduction of that input signal in dB. For example, if the signal going into the brake lite is 45 W (i.e. the KT-45 is maxed) and the brake lite is set to give 5 dB of attenuation (i.e. -5 DB), then the output signal is a little over 14 Watts based on this website. www.sengpielaudio.com/calculator-amplification.htmHere are the DB reductions for each click of the brake lite: drzamps.com/product/brake-lite-sa/Having said all that, I’d wait for somebody in Doc’s shop to answer this before I’d risk a $300 Blue. By your calculations, that would mean only that 1 is not safe, 2 is probably safe, allowing use of settings 3 and 4 to be used fairly confidently. Then it's whether 3 can compete with a drummer. KT is pretty clean so running it 2-3 o'clock should give close to 45 watts yet still be only slightly hairy.
I am having a hard time figuring out which calculator to use on the webpage actually. I tried in a few places but not getting a conversion of 45 watts to 14 entering a dB of 5.....hmmm
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Post by daddyelmis (Greg) on Aug 14, 2018 14:24:09 GMT -7
You need to put 45 in the first spot (“input”), nothing in the second (“output”), and -5 (must be a negative number for attenuation) or whatever attenuation value in dB you want, in the last spot (“level change”), and then click the calculate button on the middle blank (the number you want it to calculate).
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