[GoldfishX]

 
with which headphones? and also what kind of generes?
=)

Genre = orchestral, rock, metal, piano, synthpop, male vocals, female vocals, chiptunes, acoustic guitar, 80's dancepop, lots more...I always test with a good mix of tracks.
 
I've tried it with my Brainwavz B2, AD2000x, Grado SR-80, Futuresonics Atrio and TDK BA200. In every case, adding the Zo to the lineout improved the experience greatly. I have tried it with the HD800 and a converter, but the sound wasn't anything special. Mad Dogs need a lot of power, so not even worth trying them with anything less than a desktop amp, IMO.

 

[ratinox]

and how about the headphone out?
everyone here who tested the 1,2,8 is happy and that is good news

I've never had problems with the headphone out jack.
Headphones: Koss KSC-75; Shure SRH-840, SE215; KRK KNS-8400; Sennheiser HD 600; V-MODA Crossfade M-100.
Genres: rock, metal, new wave, industrial, EDM, pop classical (Bond) and metal classical (Apocalyptica).

DX50 hiss isn't a flaw in the amplifier. It's a flaw in the choice of headphones. You'll experience the same phenomenon with any amplifier and poorly matched, too sensitive headphones.

 

[Marco Angel]

I've never had problems with the headphone out jack.
Headphones: Koss KSC-75; Shure SRH-840, SE215; KRK KNS-8400; Sennheiser HD 600; V-MODA Crossfade M-100.
Genres: rock, metal, new wave, industrial, EDM, pop classical (Bond) and metal classical (Apocalyptica).

DX50 hiss isn't a flaw in the amplifier. It's a flaw in the choice of headphones. You'll experience the same phenomenon with any amplifier and poorly matched, too sensitive headphones.

 
 

  Genre = orchestral, rock, metal, piano, synthpop, male vocals, female vocals, chiptunes, acoustic guitar, 80's dancepop, lots more...I always test with a good mix of tracks.
 
I've tried it with my Brainwavz B2, AD2000x, Grado SR-80, Futuresonics Atrio and TDK BA200. In every case, adding the Zo to the lineout improved the experience greatly. I have tried it with the HD800 and a converter, but the sound wasn't anything special. Mad Dogs need a lot of power, so not even worth trying them with anything less than a desktop amp, IMO.

Cause im looking for this dx50 to be just as its planed, to be portable with headphones, and also im not planing add another external amp
my headphones are se215, mdr-ex600, philips shp-8900, not that used to portable audio but since im going on the move im wanting to some better than a phone
i came from hi-end speakers so im being choosy on this election =)
The hiss you perceive is only on quiet songs? or when you pause a track?
thanks again

 

[salavat]

DX50 hiss isn't a flaw in the amplifier. It's a flaw in the choice of headphones. You'll experience the same phenomenon with any amplifier and poorly matched, too sensitive headphones.

 
I would not agree to that. I have FAD Heaven VI and there is a slight hiss while connected to DX50 (LO). They are very sensitive. But there is no hiss when the same headphones connected to O2 amp/DX50.
 
I must say that hiss does not bother me at all.

 

[mp3]

Is anyone using Pfe232 with the DX50? How do they pair up? Any hiss?

 

[ratinox]

I would not agree to that. I have FAD Heaven VI and there is a slight hiss while connected to DX50 (LO). They are very sensitive. But there is no hiss when the same headphones connected to O2 amp/DX50.

Every op-amp in the world generate noise. Every one, regardless of price, regardless of implementation, regardless of build quality. Every single one. It's how op-amps work. Some generate more noise than others but they all generate noise.

Resistors generate noise. It's called Johnson noise after it's discoverer at Bell Labs around a century ago. I mention this because while it typically is not the most prevalent source of noise in an op-amp implementation it can be a cause and it can contribute to potentially audible noise.

Whether or not noise is audible as a hissing sound depends on the sensitivity (efficiency) of the driver and the amplitude of the noise on the line. If the noise on the line has sufficient amplitude to move the driver then the driver will generate sound. If the driver's sensitivity is above this noise floor then the noise will not have sufficient amplitude to move the driver and no sound will be generated. You can disagree if you want but I stand by my statement and the science behind it: if you hear hissing from DX50's headphone jack then you're wearing headphones that are too sensitive for the amplifier.

 

[eduardo1969]

I am new to this all ,i have a ibasso dx50 and the bowers & wilkins p5 headphone ...
I want to know if a amp is a good or bad idea (fiio e12 i like )

Correct me if i am wrong ,but i only need a amp if i hear a hiss on my p5 ?
Or are there other benefits when using a amp like fiio e12 and the imbasso?

 

[Marco Angel]

I am new to this all ,i have a ibasso dx50 and the bowers & wilkins p5 headphone ...
I want to know if a amp is a good or bad idea (fiio e12 i like )

Correct me if i am wrong ,but i only need a amp if i hear a hiss on my p5 ?
Or are there other benefits when using a amp like fiio e12 and the imbasso?

Let your ears decide, try switching on the gain section, i guess that the internal amp is enough powerful to drive portable headphones

 

[salavat]

Every op-amp in the world generate noise. Every one, regardless of price, regardless of implementation, regardless of build quality. Every single one. It's how op-amps work. Some generate more noise than others but they all generate noise.

Resistors generate noise. It's called Johnson noise after it's discoverer at Bell Labs around a century ago. I mention this because while it typically is not the most prevalent source of noise in an op-amp implementation it can be a cause and it can contribute to potentially audible noise.

Whether or not noise is audible as a hissing sound depends on the sensitivity (efficiency) of the driver and the amplitude of the noise on the line. If the noise on the line has sufficient amplitude to move the driver then the driver will generate sound. If the driver's sensitivity is above this noise floor then the noise will not have sufficient amplitude to move the driver and no sound will be generated. You can disagree if you want but I stand by my statement and the science behind it: if you hear hissing from DX50's headphone jack then you're wearing headphones that are too sensitive for the amplifier.

 
We are talking about audible hiss, not theoretical levels. What I am saying is that my headphones produce audible hiss when connected to DX50, and produce no audible hiss when connected to O2 fed by same DX50. My headphones are very sensitive ones, still dead silent on O2.

 

[ratinox]

We are talking about audible hiss, not theoretical levels. What I am saying is that my headphones produce audible hiss when connected to DX50, and produce no audible hiss when connected to O2 fed by same DX50. My headphones are very sensitive ones, still dead silent on O2.

Nothing that I wrote there is theoretical. It's real. It's measurable. It's basic electronics. If the driver is sensitive enough to go through the noise floor then you will hear noise. It's that simple.

 

[nc8000]

We are talking about audible hiss, not theoretical levels. What I am saying is that my headphones produce audible hiss when connected to DX50, and produce no audible hiss when connected to O2 fed by same DX50. My headphones are very sensitive ones, still dead silent on O2.

Which means that your phones are too sensetive for the DX50 amp. That's not a fault with either product, just a poor match.

Now an amp that produces audible hiss with any headphone on the market ....

 

[wickson]

All of my iem hiss with the dx50. Just purchased a shadow and pico slim to alleviate that problem.

We are talking about audible hiss, not theoretical levels. What I am saying is that my headphones produce audible hiss when connected to DX50, and produce no audible hiss when connected to O2 fed by same DX50. My headphones are very sensitive ones, still dead silent on O2.

 

[ratinox]

Which means that your phones are too sensetive for the DX50 amp. That's not a fault with either product, just a poor match.

Precisely. Go watch Jude's review of the Liquid Gold amp. He makes a point of how bad the noise is with in-ears.

Now an amp that produces audible hiss with any headphone on the market ....

You'd be hard-pressed to find such a thing these days unless you build it yourself, although I'm told that the cMoy design comes close.


Edit: well, not so much about how bad the noise is with the Liquid Gold, but that it's there with headphones that are too sensitive for the amp.

 

[Hobgoblinpie]

I am new to this all ,i have a ibasso dx50 and the bowers & wilkins p5 headphone ...
I want to know if a amp is a good or bad idea (fiio e12 i like )

Correct me if i am wrong ,but i only need a amp if i hear a hiss on my p5 ?
Or are there other benefits when using a amp like fiio e12 and the imbasso?

 
I really don't recommend the E12 for use with the DX50. It's worth saving up and buying something better, like the JDS C5, Quickstep etc. 

 

[Ishera]

Just reporting in, the physical play button have officially failed on my dx50. 1.5 month usage, 10-14 clicks a day. Nicely protected by the silicon case. It suddenly doesn't respond anymore.The forward and rewind button still very good. I hope the power and volume button doesn't fail D, since i need to press it every time i need to pause a song from now on.