LP-2020A+ mod thread

[Bare]

Originally Posted by blossom

Hi guys, good to see people still playing with these. Anyway I might have damaged mine, not sure, thought I'd just post and see if anybody can help me.

the 2 wires ended up touching each other just after they come away from the board near the RCA plugs.

Well you couldn't have used thicker more problematic wire?
Musta been tricky not to have shorts with that stuff.
IMO good chance you've damaged the Ta chip.
Did similar when two speaker wires touched.. briefly.
These don't suffer ineptitude.. gladly.
IF you choose to Fix that thing, by inserting a fresh chip.. then DO wipe off the tone bits with a hot iron as they are Still in circuit.
And those wee electro caps are unlikely to be adding goodness :-)

[blossom]

Bare

Does the wire thickness effect its ability to carry the signal properly? Or is there other reasons not to use such thick wire?
It was no problem to solder and it did not short, it was the previous wire that caused the issue I think.
OK thats about what I was guessing, I will get another chip and see how that goes.
When you say wipe off, do you mean remove the components?

[xrk971]

I just noticed that the left right channels are reversed when using 3.5 mm jack input. Is this a well known issue on 2020+? I couldn't figure out why imaging was so much better with RCA inputs until I noticed snare drums switching sides under a/b testing. What a fat blunder on the circuit!

[blossom]

Originally Posted by xrk971

I just noticed that the left right channels are reversed when using 3.5 mm jack input. Is this a well known issue on 2020+? I couldn't figure out why imaging was so much better with RCA inputs until I noticed snare drums switching sides under a/b testing. What a fat blunder on the circuit!

Interesting, should it matter what side is left and what is right?

[xrk971]

It sure does if you want to recreate soundstage, otherwise it is like stage is upside down, but worse, if true directional xy mic were used the presentation will be really off sounding. Think about it like a 3d movie viewed with the goggles swapped left to right, doesn't have 3d effect anymore.

[blossom]

Originally Posted by xrk971

It sure does if you want to recreate soundstage, otherwise it is like stage is upside down, but worse, if true directional xy mic were used the presentation will be really off sounding. Think about it like a 3d movie viewed with the goggles swapped left to right, doesn't have 3d effect anymore.

Not doubting you. Its just I don’t imagine a drum kit sounding any different if it was played upside down

[tamasic1]

Originally Posted by xrk971

I just noticed that the left right channels are reversed when using 3.5 mm jack input. Is this a well known issue on 2020+? I couldn't figure out why imaging was so much better with RCA inputs until I noticed snare drums switching sides under a/b testing. What a fat blunder on the circuit!

Dude, I just checked my amp and you're right. All of the threads and expert comments on modding this thing, how to make it sound better, give it more bass, etc, etc and you're the only person to realize the 3.5 connector is F***ed.

[Redshift187]

I checked mine, and mine is fine (red board). What colour boards do you have that have it backwards?

[tamasic1]

When I put a multimeter on the red (right) input of the RCA jack it connect to the left input on the 3.5 (MP3).

[sofaspud]

I noticed that my blue A+ board has the channels swapped. I too was hearing the strange imaging. I hadn't checked the RCA's. I just swapped the speaker outputs to correct it.