Hi! Who is familar with the BOSS LM2 Limiter Pedal?
I bought two first year versions ~ July 1987 and August 1987.

Cosmetically, both are in near mint condition.
Electronically and output, they are exactly the same,
as I've A/B'd them within several setups, amps and speakers.

In By-Pass mode, awesome pass-through output, no problem there.

But, when clicking on the LM2, starting with all knobs a mid-position,
the LM2 puts out a fuzz distortion, not clean like my MXR Dyna Comps.
And not like my Hendrix octave fuzz pedal, either.

Both LM2's make the same identical tones at the same volume/levels.
Almost sounds like a punctured speaker.

I can get rid of the fuzz if I turn the tone control towards extreme bass.

Got me to thinking that many bass players like the LM2
as it manages the lower bass notes, longer bass strings
and lower guitar signals better than signals from higher strings.

Anybody found that the LM2 is NORMAL when outputting fuzz
from an electric guitar?

Anybody use the LM2 for their bass guitar?

Do both of my LM2's have the same bad capacitor or resistor?

PLMK what you think. Thank you.
Last edited by Toppscore at Dec 1, 2013,
Hi. Forget about the fuzz I described.

I had the pedal powered by a quality 9volt power adapter.
Put in a battery for the first time = perfect cleans.
Attached the LM2 to a 12volt power adapter = perfect cleans.
No fuzz.

I do not understand why a 9volt battery will work
and a 9volt adapter is under powering the pedal?

Also, I do not understand how a 9volt battery works
in an environment that uses a 12volt power adapter.

I'd always thought that any pedal that used one 9volt battery
would only use a 9volt power adapter instead of 12volts.

What is the reason for this? Thanks.
Quote by NakedInTheRain

Very nice. Thanks. Conclusions:

* If it says ”PSA” on the bottom (or on the sticker next to the adapter jack), use a 9 volt regulated supply.

* If it says ”ACA” on the bottom or on the sticker, it will need 12 volts on the adapter jack, rather than 9. Unless you are using a daisy chain or power supply with common ground for all outputs (DC Brick, Cioks, PowerPad etc). In that case, the pedal will work with 9 volts, as long as there’s a ‘proper’ 9 volt pedal in the chain with it. And provided that there are signal cables connecting the pedals as well.
This is why I gave up on Japanese Boss. 12V is such a pain in the ass to deal with.
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An ACA pedal takes in 12vDC and then converts it to 9vDC with a resistor/diode combination. When 9vDC is plugged in it drops this diode/resistor combo drops the voltage down to ~6vDC resulting in a under-powered pedal. The 9v battery works because it is "hooked up" after this diode/resistor combo.
This is really easy to undo.
A simple jumper over these two components converts the pedal to use 9vDC therefore converting the pedal from using an ACA adapter to a "normal" PSA adapter.
Just never plug 12vDC back in or you can fry something.