Please school me on amplification

[Rex]

(My pickup is a K&K Pure Mini, no preamp, no controls, no battery, so I run from the guitar to a Boss TU-3 Tuner, (which is buffered and takes the high impedance K&K pickup down to a lower impedance), then to an Ernie Ball Volume Pedal, (the lower impedance 25k ohm version because I'd been using it for something else), then to the amp input.  Again, I'm really happy with how it sounds.)

Keith C,
I recently purchased a D-40 and installed the K&K pure mini. Hot pick-up! Serious feedback issues though.  I also run through a Fishman Loudbox, Boss TU-3, Ernie Ball Jr. volume. Recently added Boss GE-7 in attempts to EQ out tone issues. Helps a little, but not enough. When I attempt to get any high volume from the amp, feedback is terrible. Full 6 piece band so I need some stage presence with the amp.  Never had an issue with my previous rig. Have you experienced feedback issues with your K&K? I might try the Pure Pre-amp to help line up the impedance, but, at this point I am thinking about going to the piezo Anthem instead of the transducer K&K. I love the tone of the K&K, but it is almost not usable in a full-band setting. 

[Keith C]

Hi Rex, I'm sorry to say I'm just now seeing this post!   

I haven't used mine with a full band, so I'm glad to know that the feedback is something to watch out for.    The Graphic EQ is certainly a good thing to try as a solution though.

For anyone still hanging in there on this thread, I thought I'd give an update.  I played a local coffee shop with a friend this past weekend, and the OM / Loudbox mini combination worked pretty well.

The coffee shop is a long, narrowish room, we were set up at the back, with about 25 people or so listening to the music.

I had both the guitar and an SM58 plugged into the Loudbox mini.  The amp was set with the master volume all the way up, and the guitar input at about 10:00, and also the mic input at about 10:00.  I set the amp behind me on an amp stand, and I could hear my amp and my partner's amp,  (He was playing through a Roland), and from what our friends told us, we were covering about 2/3 of the room very easily, the last 1/3 we dropped off quite a bit.

This was fine though, pretty much what we wanted given the shape of the room.  Worked great for our covers of Beatles, Eagles, Allman Brothers, and James Taylor.    All in all, much fun.   

[Koamon]

Here is my somewhat belated reply:
what it's worth regarding vocals on an acoustic amp, I would suggest an amp that has phantom power. Not sure if Loudboxes have phantom power. That way you can use condenser mics for either vocals or your guitar and you will get a better quality sound IMO. You can go high or low end. I find them to be hotter and more responsive than dynamic mics. As an alternative if you don't have phantom power, condensers like the AKG C1000 and Rode NT3 can be powered by either battery or phantom power. I have Roland street cube and I can use my Rode NT3 in it and both run on batteries if need be. Another option is the TC Electronic Mic Mechanic 2 which sounds great on either dynamic or condenser (has 24v phantom power, compresses, deesses, has Reverb/delay options and can run off batteries as well. I also have a Boss Acoustic Singer Live amp which has phantom power, a looper and vocal harmonies which I lineout to an Alto powered speaker to fill out the bottom end (you can also line out to the PA Board) My mics are a Rode NT1, Rode NT3, Shure SM87 and a Sennheiser MKE 4032 (can be powered by an AA battery, they made them last century and I got it super cheap on flea bay, trey cool)
Even though I do not claim to be any good at playing or singing, I love experimenting and surfing the learning curve...just my $.02