New Pickup, New Pre, All Free, Merry Christmas!

Discussion in 'Amps, Mics & Pickups [DB]' started by Remyd, Dec 26, 2014.

  1. Remyd

    Remyd

    Apr 2, 2014
    St. Louis, MO
    Hooray for Christmas!

    My ever-so-supportive family loaded me, my wife, and the kids down with just a crap-ton of musical gear. I got a couple of bits of electronics and a cheap piezo for a pickup. Noticed that it cost less overall (had I been the purchaser) than a "good" pickup without a preamp, and had a little food for thought. I'm such a cheap sob that I always want to know how the value priced gear really sounds.

    When I searched before, I didn't get much direct info about my specific pickup, and some people use other versions of the stomp with DB, so I figured, "Why not start a thread on TB about getting this setup installed and sounding not-awful?"

    First, the equipment list.

    Tildey is a 25 year old Englehart with Silver Slaps. Setup is a little lower than 'billy, but still on the high side. I play mostly country and folk nowadays, with a little slap, but not much. My previous pickup situation was a mic wrapped in foam shoved into the middle of the bridge. It was not ideal to amplify and added a TON of mass to the bridge. I missed a good opportunity with a blues band 'cause I couldn't get enough useful volume before feedback, and the EQ was never, ever right.

    New pickup is a $40 Shadow Electronics SH-SB1 Single Disc Transducer for Upright Bass. Feature list includes a tone/volume preamp. There is no pre-amp and neither volume nor tone controls. It does make noise when I screw around with it and I suspect there's some kind of way to make bass noises too, so it shouldn't be too bad.

    Electronic gizmo is a Zoom B1on, which is like $50, but has all the programming (but none of the interface) of their more expensive current generation multi's MS60B and B3. I never played with a multi like this before, and it's really kinda fun to make all those funny noises some out of a speaker. About 90% of all the pedals and amps and sims and phasers and flangers and whatchamagigs will be absolutely useless on a DB. But, that other 10% is (hopefully) exactly what the doctor will be ordering whenever I get this together.

    Amp is a Crate BX160 115 combo from the 80's. There's a parametric bit, gain shaping, a 7 band graphic, and a couple hi/lo boosters. Seems like a dumb choice for DB, but there's a TON of shaping built right in. It also has the advantage of being located close to home. :)

    First thing to do is to get some samples of current noises for apples-to-apples later. Recording setup is also rigged up with an old laptop, a mAudio USB Producer mic, Audacity, and the shove-it-in-the-bridge pickup. Works much better for recording than in the rehearsal room.

    Maybe I'll find out something worth writing down for future cheap-pickup searchers.


    5xvrb6.jpg
     
  2. DC Bass

    DC Bass Supporting Member

    Mar 28, 2010
    Laurel, Maryland, USA
    Congratulations on the Christmas haul!

    I had a Shadow pickup once upon a time, back in the mid 1990's. I remember it being a fine pickup. In retrospect, it probably could have benefitted from a preamp...

    Joe
     
  3. Remyd

    Remyd

    Apr 2, 2014
    St. Louis, MO
    I've been wondering how I should mount this exactly? The bridge wing is way too open for the recommended way.

    It's my recollection that a piezo is gonna pickup vibrations regardless of where it's mounted. I worry about the finish if I use that blue tacky stuff on the body and about staining if I use it on the bridge. I seem to recall having a piezo that clipped to the center of bridge near the strings using a spring clip once upon a time.

    Wedging it in place with foam seems to help, although I can't really see it being a long term solution.
     
  4. Piezo discs usually have a rather high output impedance. The Fishman BP-100 which also uses piezo discs needs a 10 MegOhms input impedance for the following amp stage for best sound.
    My Zoom zoom B2.1U has an input impedance of 1 MegOhms which is OK for most Piezo crystal pickups (like Underwood, FullCircle, Shadow SH-950/951) but not the best for piezo discs. I guess your B1 has the same input impedance as my B2.1U.
    Well 1MegOhms is way better than a lower impedance like it is is typical for most EBG amps, but next year you might want to get a better pickup or modify your Zoom for a 10 MegOhms impedance by changing the (only) 1MegOhms resistor to a 10 MegOhms one (might get difficult with SMD components, didn't had a look inside yet).

    If the slot is too open you would better take the Shadow SH-951. About twice as expensive, but fits better to the input impedance of your B1. It's good for pizz, the right pressure is important to get a good sound. Shouldn't fall out by itself but too much pressure sounds compressed.
    Arco doesn't sound nice with these cheap solutions. The SH-965NFX works well for arco, has a built-in impedance buffer, so your are not dependent on a high impedance amp or preamp input (the installation manual is wrong here mentioning a low impedance input) and is one of the cheapest working solutions for arco IMHO. But costs about five times your piezo disk.
     
    Last edited: Dec 27, 2014
  5. Remyd

    Remyd

    Apr 2, 2014
    St. Louis, MO
    Hmm, how does that electrical mismatch pertain to sound changes? On my first pass, it seems like I can make some sounds, but until I nail the pickup placement, I won't be able to tell if it'll be any problem. It makes a thin, tinny noise when direct to the amp without compensation. Should have more experimentation up today, but there's no way I'm changing any components to fix a problem I didn't know about :)
     
  6. DC Bass

    DC Bass Supporting Member

    Mar 28, 2010
    Laurel, Maryland, USA
    I have always heard that you should use wooden shims to fit a piezo that is too small for the wing slot. If memory serves, I think the wood should be the same species as the bridge if possible. The fit should be snug- if it's too loose, you will lose volume, if it's too tight, you will lose quality of sound.

    I think you should be able to get a good, serviceable sound with this pickup if you can get it mounted right, but a preamp will make it a lot easier.

    Joe
     
  7. I recommend a piece of dense felt as a shim for the pickup.
    Like the ones they sell in hardware store in various shapes. (to put under chair legs, etc.)
    You can also try a piece of wine cork.
    The metal part of the pickup element against the bridge leg, and the shim between the top of the element and the bridge wing.
     
  8. Remyd

    Remyd

    Apr 2, 2014
    St. Louis, MO
    Okay, just got back from an Audition (I got the part for being solid rather than good but whatever), and will screw around this evening.

    Foam: There was some included in the package but it's really soft, a piece of my high density mute and a piece of my low density one. Don't really want to sacrifice much of my mutes though
    Cork: Don't have a real one, but I do have a fake
    Reed: Sax player gave me one to use
    Wood: I have a composite shim and a little piece of balsa that might be too thin at 1 ply and too thick at 2 ply so might not be worth the trouble.

    I might skip the recordings and just do impressions - my wife is getting annoyed. :)
     
  9. You might have some cork directly at the beginning of the new year!
    I'm not sure about the dense felt, but I heard cork works well and paper and cardboard too. Wood is good too, but it needs to be on the harder side, so maple and similar hard wood would do it, balsa is really bad, because it damps some frequencies too much. But for a first experiment it is worth a try since balsa might be deformed by the disk to fit it best.
    You should try to get a plan area in parallel to the brass plate with a hard material or maybe cork, even if it is less thick than your bridge wing slot, then you can use shims, sheets of cardboard and/or paper to fill the rest of the slot. It's probably easier to get a SH-951, even if it costs some more money. It' s thicker and you have two plan parallel areas of metal, so filling the rest of the gap is easier. Or you can take a big of wood away from the bridge (wing) if the slog is a bit too narrow.

    If you set your B1 to only carry the signal through without modification and use your pickup through the B1 compared to directly into the amp (without using the B1) you might get an impression about different sound qualities. Input impedance needs to be extremely low (like the line input of a mixer console) to get almost no sound at all. It is about the sound quality, not getting a sound or not. You might live with the sound of your equipment now, but I'm pretty sure it is not optimal (because of the input impedance of the B1 being a bit low for the piezo disk but also because the piezo disc is hard to apply in the bridge wing).

    Usually piezo discs are either glued on the bridge below the strings, see the BP-100 or other pickups by K&K. The instructions by Shadow are rather bad, I think.
    I used piezo disks in a different way below the bridge foot of a solid body EUB (plan surface, not a curved top), but this needed the naked disc to be sandwiched between layers of wood. Needs a lot of work to get the shielded cable out there and make it a bit more robust against cable movement. Also cannot make them no thinner than 4 mm thick, which was OK for my application but probably unusable for an acoustic instrument.
     
  10. Remyd

    Remyd

    Apr 2, 2014
    St. Louis, MO
    Mutes, BTW, are from my BG.

    Foam: High density is a bad choice, it's the wrong size, shape, and color. It doesn't quite get the right height at 2x and I can't get 3x through the hole. It's also bright blue, which will look absolutely awful. Packaging Foam is a low-ish density foam backed with a sort of car-headliner fabric. The proportions are all wrong and the foam isn't dense enough to hold tightly, even though I had trouble physically getting it through the hole. The foam from my regular BG mute was OK, but volume was notably low and there was some buzzing when amped to compensate.

    Balsa, as expected, was the wrong thickness entirely. Also, the tenor sax reed was too thin. I don't know where to get a bari one without buying it, so that was also a no-go. The shim kept falling out, so I threw it on the floor, and it broke in half. Still didn't fit. I had a felt pick of the wrong thickness, but nothing else felt-y.

    Cork (or rather artificial-polymer-that-takes-the-place-of-cork-in-mass-produced-wine) turned out to be the best fit. Thank you @eub_player!

    My first cut was too big, and the second was too small. The third was, of course, just right to push the disk firmly without bending. Turns out that the disk was exactly the same size as the cork and it looks much, much better with the blonde cork-y thing.

    Wow, the volume difference is startling. The tone is much fuller with the cork than it was with any of the other choices, and it really sounds pretty good when eq'd through the amp. I got a couple minutes to play with the pedal too. I didn't get a chance to tune anything, but a wokka-wokka-wokka sound as reinforcement to my bass made me laugh out loud.

    I'll hopefully get some pictures and another track or two recorded tomorrow - the missus has to work :)
     
  11. The reeds are typically used with the Underwood or SH-950/951 kind of piezo because of the plan parallel surfaces. Anything I know that is intended to be used in the bridge wing has parallel plan surfaces, so trying the piezo disk there is a bit exotic and difficult as you have seen.

    If the sound of your pickup with cork works for you and your musicians, there is no need to change something. If you want a better sound, there is always something more expensive that generally (but not always) sounds better than a really cheap solution, it is just the question if it is worth the money. I think up to $250 it might be worth pulling out some more money, but the best idea is to look through the used items in the classifieds because you won't loose much money if you want to sell it again and try something else.
     
  12. Remyd

    Remyd

    Apr 2, 2014
    St. Louis, MO
    Okay, you'll have to forgive me 'cause I only had an hour to do these samples, but here are direct pickup and a chop of some effects on the B1on.

    This will take some pretty serious tweaking, but it's gonna sound outstanding at the end!!!


     
  13. Remyd

    Remyd

    Apr 2, 2014
    St. Louis, MO
    Overall impressions:

    Shadow SH-SB1 is a cheap piezo pickup that might sound like crap out of the box.
    Zoom B1on is really a cool gizmo, but there aren't any stock sounds for this situation, so you'll have to roll your own.
    Audacity is REALLY limiting and mAudio Producer USB is a POS mic.
    I need to buy some better gear immediately.

    Now, to go work on the BG!
     
  14. Yes well, but I do think the last patch sounds better than direct pickup.
     
  15. Remyd

    Remyd

    Apr 2, 2014
    St. Louis, MO
    Agreed. When I have more time and less ear fatigue, I'll really dial in something that I like, but I'm booked AM and PM for the first part of next week, which is good for the ego and wallet, but bad for sitting down to play the same lick a jillion times.
     
  16. Remyd

    Remyd

    Apr 2, 2014
    St. Louis, MO
    2 rehearsals in and everything is working like a dream. I've gotten compliments on tone from both groups as compared to the crappy pickup method from before. I have a jam session with a bunch of guys that are a hundred times better than me on Sunday, so we'll see how that goes.

    That cheapie Shadow Pickup / Zoom B1on combo blows me away for less than $100!!!