Well,
I'm not a techie, but, that's my understanding as well. 1 Meg is kind of the minium impedance load for a piezo pickup. Between 2 and 4 Meg is the sweet spot for
my gear.
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Double Bass Trying to Help My Son Solve His Upright Feedback Issue
- Thread starter Jeff McKerlie
- Start date
Well,
I'm not a techie, but, that's my understanding as well. 1 Meg is kind of the minium impedance load for a piezo pickup. Between 2 and 4 Meg is the sweet spot for
my gear.
That is absolutely correct, Chris!
I never did get to test going into the MXR EQ straight vs using something with higher input impedance. But I wish I knew what the input impedance of all the amps I've used over the last 13 years are, because I've run it straight in to a lot of different amps, and some actually weren't Ampeg
and I've never had a problem with any of them. I seem to recall the folks at Upton saying the Rev Solo was optimized for working with more standard impedances. But who the heck knows what that means without specific numbers?Still, not like I'm trying to make a case for the MXR...thought it might be a viable and relatively cheap choice, but there are better and more specific upright EQ's out there.
Greg Clinkingbeard
Commercial User
I never did get to test going into the MXR EQ straight vs using something with higher input impedance. But I wish I knew what the input impedance of all the amps I've used over the last 13 years are, because I've run it straight in to a lot of different amps, and some actually weren't Ampeg
Still, not like I'm trying to make a case for the MXR...thought it might be a viable and relatively cheap choice, but there are better and more specific upright EQ's out there.
Jimmy,
Most amps I've owned and played were 1 Meg Ohm. Gallien Krueger, Walter Woods, and Ampeg PF Series. What's really interesting to the B-15 crowd we run with is
that the three inputs on a B-15N are different impedances. 5.6 Meg Ohms, 1 Meg Ohms and 2.2 Meg Ohms. So they were way ahead of the piezo game, before piezos
even existed. Evidently magnet pickups were all over the place in the 1960's. Markbass is the only company I can think of that has some amps set at 500K.
Did have an LMII at one time and it sounded good with the upright plugged straight in
Did not know that about the B-15's, though...will have to try to bust mine out and try each input and see what happens.
5 MegOhms seems to be the magic spot for my pickups, which might explain why I really liked the only B-15 I ever plugged into.
Apparently Jess Oliver (designer of the B-15N) set the amp up that way. I think David (Beans on Toast, our resident Talkbass Ampeg Guru) said that pickups in the 1960's varied a lot. So, Jess covered all the basses. (pun intended)
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After 30 years of dealing with (and hating) piezo pick-ups, I found and absolutely adore the Krivo magnetic pick-up. No feedback. You're welcome:
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To each his/her own. I once had a Tonnengies Magnetic pickup.
I also once used a Realist, and in truth didn’t like either of them. Now I use a Ehrlund EAP or Remic 5400LB. If I really need to play loud, a Lakland 55-94 fretless suits my needs. Just my take however.
Occasionally I have played a bass with a mag pickup, and danged if they don't sound a lot like Precisions
Occasionally I have played a bass with a mag pickup, and danged if they don't sound a lot like Precisions
I remember seeing an old ad in Bass Player years ago with NHOP endorsing some kind of mag PU ("The secret's out, I use the [whatever the name was] mag PU"). Intriguing, yet really expensive (around $500 at the time). Years later I find this Krivo PU with similar design characteristics as NHOP's, and I decided to take the plunge. I couldn't be happier with the device. I use D'Addario Helicore Hybrids and even the bow sound is acceptable.
Looks like a fine pickup and with magnetics you can definitely push the volume up over piezos. If being really loud is a must, I'd probably go mag, too. But that Rev Solo has a sound...
I rarely play loud on URB; I just always dug NHOP's sound, hence my direction toward a mag PU. The fact that it comes with no feedback issues is a nice extra.
Mag PUs....millions of EBG players can't be wrong!
I think it was called a 'string charger' by Pierre Joseph. He also made a preamp called a 'dream box', I believe. Hopefully someone a little older than me will jump in and correct me if I've remembered this wrong...
I've been using the Ehrlund EAP for about 4 years but never found the "sweet" spot on my Bohemian Bass so am now using the old Realist that I originally used. The Realist seems to amplify all 4 strings evenly wheras the Ehrlund was either weak on the G or E string depending on where I placed it. Anyway, long story short, it's on Craigslist SF for sale.
I'm also a Krivo believer after discovering it several months ago. We play loud shows and even with the mag pup, some of the rooms just bounce sound all over which still caused feedback on certain notes. Stage sizes vary which means my floor monitor is placed in different places causing feedback. Outdoor shows on bigger, I can bring the SVT II.
I now use a DIY removeable P bass circuit mounted to the underside of the fingerboard with velcro so I can control the volume and tone on the fly. I can also tuck a G10 wireless underneath which eliminates the cable and any ground noise.
I now use a DIY removeable P bass circuit mounted to the underside of the fingerboard with velcro so I can control the volume and tone on the fly. I can also tuck a G10 wireless underneath which eliminates the cable and any ground noise.
Hit you do not play left handed it might get problematic in thumb position. But on the other side that might be a nice thing for right-handed players.
