George, my speaker is 84db and the input impedance on the Job amp is 51k. Amazing sounding amp. I have read that older units had a grounding issue that caused the noises I am having.
@grannyring...i use an LDR preamp effectively as an attenuator at the Job inputs. the LDR piece is set at a specific level and simply left there. input switching and system gain adjustments in use are still handled by my Modwright preamp. rick schultz made this suggestion when i contacted him to build me a set of his evs ultimate attenuators. works perfectly - DRAMATICALLY reduced the noise floor of my system and enabled me to dial in the system gain such that the VC in my preamp now offers very fine control of overall system gain.
i agree that the 225 is a fantastic sounding amp, but does require some care in implementation for the gain and sensitivity. once worked out, it's truly excellent.
Thank you very much srosenberg as this is a mighty fine idea. I was thinking of just using Rothwell attenuators, but they may degrade the sound? I have not used the Rothwells before. I love this little amp. Best value in high end along with the Lightspeed attenuator.
It’s not that the Rothwell’s themselves can "change the sound in not such a great way"
But what the Rothwell’s can do is change the perceived impedance as seen by the previous stage, as then not to have a good impedance match. This can mainly happen with a tube or passive preamps, most solid state preamps should not have this problem
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