Hi!
I know the Line Magnetic LM-mini84ia is not a diy amplifier, but I hope to qualify to the forum by wanting to modify said item. Admin is free to remove and tell me to F off if I'm stepping out of bounds! I'm also not a native english speaker.
I recently bought a used Line Magnetic LM-mini84ia integrated/headphone amp. The thing is the headphone output is really bad, as soon as the volume goes up to a little louder listening levels I get massive amounts of distortion. IEMs works better than my headphones (dan clark aeon 2C). I know the headphones require a little more power so I think the juice is running out.
I open the back of the amplifier and found a 470 Ohm resistor inline with headphone socket.
The speakerjacks sounds really good and provides a lot of power, I would like the same in my headphones 🙂
Somebody have any insight to what kind of modifications I can make (possibly outsource) to not restrict power to headphone jack?
I have not been able to find schematics to the amp in question.
Regards Jakob
I know the Line Magnetic LM-mini84ia is not a diy amplifier, but I hope to qualify to the forum by wanting to modify said item. Admin is free to remove and tell me to F off if I'm stepping out of bounds! I'm also not a native english speaker.
I recently bought a used Line Magnetic LM-mini84ia integrated/headphone amp. The thing is the headphone output is really bad, as soon as the volume goes up to a little louder listening levels I get massive amounts of distortion. IEMs works better than my headphones (dan clark aeon 2C). I know the headphones require a little more power so I think the juice is running out.
I open the back of the amplifier and found a 470 Ohm resistor inline with headphone socket.
The speakerjacks sounds really good and provides a lot of power, I would like the same in my headphones 🙂
Somebody have any insight to what kind of modifications I can make (possibly outsource) to not restrict power to headphone jack?
I have not been able to find schematics to the amp in question.
Regards Jakob
Just reduce the value of the series resistors, and increase the resistors' power rating.
There's no actual need for the resistors all, but you will hear more hum and noise
with smaller or no resistors. The headphones appear to be 13 ohms, so they can
connect directly if you want, which should blast your ears completely off.
You can just connect smaller resistors, or wires, across the existing 470R resistors.
There's no actual need for the resistors all, but you will hear more hum and noise
with smaller or no resistors. The headphones appear to be 13 ohms, so they can
connect directly if you want, which should blast your ears completely off.
You can just connect smaller resistors, or wires, across the existing 470R resistors.
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Thanks, blasting my ears of is exactly what i want to do! The headphones really wants a lot of power, so i think i can manage volume quite easily even if I solder in a piece of wire instead of the resistor. I can adjust the output level from my RME dac if it gets to sensitive.
Yes of course. I already have a small dip in some frequencies from working construction without proper hearing protection, I am not looking to get more. The thing is that the output was ridiculously low, it did not allow any dynamic headroom at all. When listening to classical it was fine, but when the crescendo hit it was distortion fest. I will see if i find any fitting resistors in my stash to try out first maybe.
Yes, seems like the amplifier was clipping. Try 10 ohms 3W in parallel with each of the 470R to start.
The deed is done. I could not find any local shop that had resistors in stock, theu only tiny ones. So straight wire it is. Now it sounds just great, no more distortion. The headphones do require a lot of power so volume control was okay, I still get quite good range and you are not afraid to turn the know, only past 11-12 it gets scary.
Thank you for your consultation!