Head-Fi.org › Forums › Equipment Forums › Portable Headphones, Earphones and In-Ear Monitors › New JH Audio flagship! "Siren Series Roxanne"
New Posts  All Forums:Forum Nav:

New JH Audio flagship! "Siren Series Roxanne" - Page 59

post #871 of 7335
Now here is what I do not understand . Given the Ba are very little in ind. yet they imp matching is important to the amps.

With headphone amps it is the opposite , there is little effect with damping.

Al D
post #872 of 7335

Does this mean that I'll be screwed if I use the Roxanne with an amp?

I'll be using it primarily with my galaxy S4 though.

(Apologize for the noob question)

post #873 of 7335

Most probably only if your amp has high output impedance.

From my experienced, the stock AK100 with 22Ohm OI screw ups the sound of TG!334 and JH13 by rolling-off the low frequency.

post #874 of 7335
Anything lower than 3 and down it will not effect it.

My first separate amp was from the the company that v moda. Uses for the vamp , sorry the name alludes me rt now .

The dac was good and it worked right from the iPhone 4S I had. The amp had an output of 40 ohms. Who would do this . We'll they did . I always wonderd why my jh16 sounded better from the iPhone. Until I started reading here. Later on there was a mod to lower it down to 10 ohms . I did it , and it did sound much better. I gifted the dac and bought the v moda. The black one I think. It had a very low imp and the story does not end there. I own a mytek estero 192 .

Good dac and a fairly. Good amp , imp from factory 10ohms , modded later to 1 ohm Aaahhhh. Much better. Most phones are low output.

Read below

July 25, 2013
[Update: The July 2013 firmware update for the S4 SGH-I337 I337MVLUAMG1 has fixed the "crackle/instability" problem discussed below. All audio characteristics have been confirmed to be unchanged except for the absence of the oscillatory instability. ]

This note provides audio measurements of the Samsung Galaxy S4, including dependence on headphone impedance. Using earbuds or headphones with a nominal impedance of over 32 ohm provides a superb music listening experience in my opinion. The outstanding audio quality of the S4 is supported by the measured extremely low background noise level and very low distortion levels reported elsewhere and verified by new measurements reported here. The measurements reported here, however, were motivated by reports from S4 users having audio quality issues using low-impedance headphones on the order of 12 ohm. The stock headphones provided with the S3 and S4 have impedances at 1 kHz of ~ 35 ohm (measured). Based on my measurements on a single S4 (SGH-I337), there is no problem with headphones with an impedance of 16 ohm or higher. The internal impedance of the S4 headphone output was determined to be ~ 1.2 ohm at 1 kHz by measuring the output voltage drop with a 10 ohm load and comparing to the output voltage with no load (open output).

To check out any audio problems quantitatively, the headphone output of the S4 and S3 smartphones were connected with various pure resistive loads with values ranging from 10 to 33 ohm. Pure sine wave audio tracks with format .wav and 16bit/44.1 kHz and with -0.8 dBFS (almost full digital amplitude) were synthesized and saved as audio tracks on the smartphones. The tracks were played back using Music player and with default settings (no EQ etc.). The output on the left/right channels were monitored using a Digilent Analog Discovery dual-channel USB oscilloscope. The sound quality was also determined using a parallel connection to an Edirol MA-15D micro monitor amplifier/speakers. Various cable interchanges and substitutions verified that the results below are real and are associated with the S4. The measurement configuration is shown below. The breakout box shows the load resistors on the left connected with banana plug binding posts, one for each audio channel:

Al D
post #875 of 7335
Quote:
Originally Posted by ALRAINBOW View Post

Now here is what I do not understand . Given the Ba are very little in ind. yet they imp matching is important to the amps.

With headphone amps it is the opposite , there is little effect with damping.

Al D

 

Not sure if I follow your question exactly - but if it's why BAs seem to be more sensitive to impedance, I believe it's largely because of the crossovers in the circuit.  

post #876 of 7335
That was my question exactly sir. And your answer although may be correct. Makes no sense to me .

So is there any other takers in this ??

As useing speaker amps it is not matter and I know speaker amps are low imp. But if you make a bridge to balance the output to your amp and a attenuating resister too . You end up with a high imp to your headphones and it does not matter. So why the iem,s.

Al D
post #877 of 7335

I did a bit of searching for something that went into it without getting too technical, I believe nikongod is a pretty respected head-fier on amp building and such:

 

http://www.head-fi.org/t/582015/how-much-does-source-impedance-of-an-amp-alter-the-sound-of-a-headphone#post_7919936

post #878 of 7335
Well it does make sense as stated. Good reading and thanks.

Al D
post #879 of 7335
Ps. So that must be why headphones sound fine because they have no crossover. Wow I am learning here . I'll bet most people including myself did not know have answers to the why in this except hearing it. Very cool man good read.

Al D
post #880 of 7335
Quote:
Originally Posted by Mimouille View Post


So what color and art did you choose? I usually like classics....black opaque or clear shell.

Bellbottom blue face plate and clear shell

 


Edited by pekingduck - 11/30/13 at 5:50pm
post #881 of 7335

^ very nice

post #882 of 7335

You can get whatever you want.  They offered me the RED flying girl, but I declined.  I though the titanium flying girl against the CF background was subtle and classy.

post #883 of 7335
Yes I think so too. I have the jh13. Black faceplate with the flying girl in a pail purple. It's the way it came long story. But it looks cool for not to be so outstanding.

Al D
post #884 of 7335

So silly question... I've become quite attached to having a right angle jack w/ my aftermarket cable for my TG!334.  

 

Any chance of getting that as an option?  I only saw options for cable length.

post #885 of 7335
Quote:
Originally Posted by pekingduck View Post

Bellbottom blue face plate and clear shell


So fresh so clean.
New Posts  All Forums:Forum Nav:
Head-Fi.org › Forums › Equipment Forums › Portable Headphones, Earphones and In-Ear Monitors › New JH Audio flagship! "Siren Series Roxanne"