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DX7 Pro Headphone Amp Upgrade?

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Dec 22, 2020
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#1
Hello Audio Science Review Community,

i own a Topping DX7 Pro for several month and i use it with a pair of Grado GS 1000 and Beyerdynamic Amiron Home.

I was asking if there will be any sound quality improvement from another headphone amp connected to the DX7 Pro?
Maybe a Topping A90?

Thanks for your help :)
 

Doodski

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#2
The Topping A90 has more power output, less output impedance although the DX7Pro output impedance is still pretty low and as far as SN at 50 mV output the A90 beats the DX7Pro. Your Grado GS1000 cans are SPL 1mW @99.8 dB output and so I think either amplifier will do the job very well.
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OP
domiji
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Dec 22, 2020
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Thread Starter #3
Hello Doodski and thanks for your help :)

So there won't be any great improvement in sound quality i guess.

I've good the feeling that the Grados sound a bit to bright and analytical with the DX7 Pro. I've changed the OP Amps inside the headphone section to a pair of Burson V6. I couldn't say if it is just my mind of if it really sounds a bit more "relaxed".

I thought maybe an additional headphone amp would do the job better. Maybe i should try some EQ with the Grados. I tried some EQ with my Amiron Homes but i didn't like it in the end.
 

Doodski

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#4
Hello Doodski and thanks for your help :)

So there won't be any great improvement in sound quality i guess.

I've good the feeling that the Grados sound a bit to bright and analytical with the DX7 Pro. I've changed the OP Amps inside the headphone section to a pair of Burson V6. I couldn't say if it is just my mind of if it really sounds a bit more "relaxed".

I thought maybe an additional headphone amp would do the job better. Maybe i should try some EQ with the Grados. I tried some EQ with my Amiron Homes but i didn't like it in the end.
EQ is a very good start. EQ will give you the most obvious change. You won't hear a difference between the two Topping amps unless you are turning the power wayyy up or have very difficult to drive headphones. I have been told that the Grado headphones generally sound bright and I have never heard them so I don't know first hand.
 
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domiji
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Thread Starter #5
Thank you very much - that helped me a lot!

I think about to swap the Burson V6 out for the original LME49720. Maybe it was just my mind that told me it has to sound more relaxed :)
What do you think?
 

Doodski

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#6
Thank you very much - that helped me a lot!

I think about to swap the Burson V6 out for the original LME49720. Maybe it was just my mind that told me it has to sound more relaxed :)
What do you think?
OP amp rolling generally can be productive but in most situations any difference will be in the gain of the OP amp causing a loudness difference. Sometimes the distortion and noise from a different OP amp will be better but not always. OP amp rolling is generally not going to make a change that is worth the bother and sometimes the designer picked a specific OP amp for reasons we don't know and substituting that for another just makes things worse. OP amp rolling is a good way to muck about with electronics for newbies and can be fun. :D
 
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