Jose Hidalgo
Addicted to Fun and Learning
Hi all,
So I have received my two replacement Topping L30 headphone amps (2102xxxx). They both work, but I have noticed a big sound difference One of them outputs a sound that could be considered as "normal", but the other one has way too much treble, to a point that I have to EQ it down -6 dB in order for it to become "hearable". Let me emphasize this : the difference is not small, one of them just hurts my ears beyond any reasonable doubt.
Here's my setup : Windows 7 PC (USB) --> Topping E30 (RCA) --> Topping L30 (n°1 or n°2) --> Headphones
If L30 n°1 is connected, sound is about "normal", and if L30 n°2 is connected, sound is "not normal".
I'm using the same RCA cable alternatively, and also the same L30 power adapter alternatively.
So I think I've narrowed down the issue to one of the two L30. I don't see what else it could be.
I'd like to identify/prove what's going on precisely, so I'm guessing that measuring each L30's frequency response would be a good start.
Unfortunately I'm a measurement beginner, so I wonder how I could achieve that without having to buy any additional stuff.
So far I've just tried connecting the L30 headphone output by my PC microphone imput via a 3.5mm cable, and then recording that input via Audacity.
Then Audacity could generate a spectrum plot, so I could compare spectrum plots from both L30 amps and see what's going on.
But that doesn't work: Audacity doesn't record anything, no matter what I try. I'm guessing it's an impedance problem or audio level problem.
Audacity settings are :
Are there better/other ways of achieving this ? Thanks in advance.
So I have received my two replacement Topping L30 headphone amps (2102xxxx). They both work, but I have noticed a big sound difference One of them outputs a sound that could be considered as "normal", but the other one has way too much treble, to a point that I have to EQ it down -6 dB in order for it to become "hearable". Let me emphasize this : the difference is not small, one of them just hurts my ears beyond any reasonable doubt.
Here's my setup : Windows 7 PC (USB) --> Topping E30 (RCA) --> Topping L30 (n°1 or n°2) --> Headphones
If L30 n°1 is connected, sound is about "normal", and if L30 n°2 is connected, sound is "not normal".
I'm using the same RCA cable alternatively, and also the same L30 power adapter alternatively.
So I think I've narrowed down the issue to one of the two L30. I don't see what else it could be.
I'd like to identify/prove what's going on precisely, so I'm guessing that measuring each L30's frequency response would be a good start.
Unfortunately I'm a measurement beginner, so I wonder how I could achieve that without having to buy any additional stuff.
So far I've just tried connecting the L30 headphone output by my PC microphone imput via a 3.5mm cable, and then recording that input via Audacity.
Then Audacity could generate a spectrum plot, so I could compare spectrum plots from both L30 amps and see what's going on.
But that doesn't work: Audacity doesn't record anything, no matter what I try. I'm guessing it's an impedance problem or audio level problem.
Audacity settings are :
- Devices > Interface > Host : Windows DirectSound
- Devices > Recording > Device : Main audio capture driver
Are there better/other ways of achieving this ? Thanks in advance.