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Old 12-04-2017, 09:03 PM
Wooly Wooly is offline
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Join Date: Jul 2007
Location: Alberta, Canada
Posts: 602
Default Mic input on Loudbox

I have this new LR Baggs M1 passive which isn't a real hot pickup. I have been running it through a Behringer ADI21 into the mic input on my Loudbox Mini. (We're talking just for home use here.) I am getting a very nice sound and A LOT of volume. Compared to plugging it into the regular guitar channel with the ADI21, I get a nice sound also, maybe a little better, but not near the volume. I have to turn everything up a lot. Why would that be and is it OK to put it through the mic channel?

I have noticed also that in the guitar channel, The A string starts vibrating and feeding back until I hit the phase switch on the amp. Maybe my strings are too close to the pole? I didn't think that a phase switch would matter with a magnetic pickup?

Enlighten me please.
Larrivee OM-03
Seagull SWS Maritime Mini Jumbo
Alvarez AP70SB Parlor
Alvarez AF60SHB
Ibanez Concord Model 684
La Patrie Concert
An old Harmony
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Old 12-04-2017, 09:43 PM
jseth jseth is offline
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Join Date: Dec 2008
Location: Oregon... "Heart of the Valley"...
Posts: 8,358

Well, the M1 is passive... so the signal it sends is high impedance, while the mic input on your Mini is low impedance... running it through a different unit (the Behringer) and out must be giving the signal the transformation from high>low - that's why it works through that input.

When you go into the regular channel on the Mini, the signal from the M1 is again "stepped down" to low impedance, BUT the channel "wants" to hear a high impedance signal... so you have to jack the controls around to get the sound you want... in essence, the input signal is weak when compared to what the input on the amp wants to see...

As for the feedback? Well, welcome to the Wonderful World of Amplifying Acoustic Guitars!
"It isn't for the money... and it's only for a while.
You stalk about the rooms and you roll away the miles.
Gamblers in the neon, clinging to guitars;
you're right about the moon, but you're wrong about the stars...
And when you stop... to let 'em know you've got it down;
it's just another town along the road..."

The Road
(Danny O'Keefe)
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