Thanks Lens, On Fri, Jul 18, 2014 at 1:22 PM, Len Ovens <len@xxxxxxxxxxxxx> wrote: > On Fri, 18 Jul 2014, Oon-Ee Ng wrote: > >> Hi, I'm running Arch Linux 64-bit with jack2. I have a USB UA-25EX to >> which I connect a Shure SM75. I don't do much recording, and at a very >> amateur level for various volunteer projects. > > > SM75? or SM57? Everything I look up on sm75 turns out to be an sm57... So a > dynamic mic. (Phantom off) My typo, SM57 it is. > > >> The maximum volume I get from my Shure SM75 seems very low. The result >> of this is when I normalize I get fairly significant background hum. >> Increasing the UA-25EX's gain just causes peaking at louder volumes, >> so no solution there. This happens with both Audacity and Ardour, so >> should not be software-related. >> >> Any suggestions as to what I should investigate? A bad mic (I did >> check, its not a knock-off)? Electrical noise from my laptop (used to >> use a different laptop but from the same manufacturer, same results >> from both). Jack settings? > > > I get that you did not buy this mic, but that it is whatever is around. > There are a number of mics that look like the sm57. The only shure mic with > a 75 is the pe75 (looks sm58 - ish) If you have a shure PE75H, it is a high > impedance mic (30k plus) and probably comes with an xlr to 1/4 inch cable. > If so, try pluging into input 2 and setting high impedance (HI-Z). Note: on > this mic pin 2 is not connected, so using an xlr to xlr cable will not work > right. (there is a PE75L that is properly connected inside the mic) I did buy this mic, but that was a long time ago and as I mentioned, I rarely record. It was just so I would have a mic when I needed one (as opposed to the headphone-jack mics I was using prior to that. Yes it comes with a XLR to 1/4 inch. I will try the Hi-Z and see if that helps. > > Please note that whatever mic you have, (PE75 or SM57) it is designed for > close mic work, not for area mic use. > > You say the mic causes peaking at higher levels, yet I would suggest it > needs to be almost to the top. The odd peak from touchong the mic or > plosives is probably not a problem. (use the limiter provided - peak LED > green) Use your ears above looking at flashing LEDs or even waveforms. As soon as the peak LED activates I can audibly hear peaking, unfortunately. I've tried the built-in limiter but it seems to produce the same audible result (to my ears). > > As you may have guessed... I am mostly guessing :) we need to know what you > are recording... how far from the mic, what are the settings on the > UA-25EX... all of these things. As you can tell it even matters what kind of > cable and which input you are using. Thanks. This is a busy weekend for me, but I'll reply on these very soon! Mic distance is anywhere between 2-6 inches from the (solo) speaking voice beint recorded. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
