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[Official] OCN Headphones and Earphones Club - Page 1093

post #10921 of 38372
If any of you have a sec and would like to stop in and give me some advice on amps for low impedance headphones, thatd be great smile.gif

http://www.overclock.net/t/1190040/amps-for-low-impedance-50-ohm-cans/0_20#post_16031928
post #10922 of 38372
List is up to date thumb.gif. Happy Holidays GUYS!
 
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post #10923 of 38372
***Bump***

Today I realised that there is another misnomer amongst audio forums. For example, I put my Denon D2ks and Sennheiser HD650s on three different amps today. Fiio E9/E7, Little dot MKIV, and the Denon PMA-2010AE. There is a huge difference between the last one and the previous two. For example :

1. Treble wise, the Denon D2K had an issue on the FiiO and Little Dot MKIV. They were cut off!! I confirmed this with my FiiO E11. Upon plugging the D2Ks in the PMA-2010AE everything tuned up to a whole new level. The treble was so much better. No more cut off from the amplifier and the frequency was pleasantly high they way it should be. The bass ... I am speechless. The synergy between DENON components is flawless. The PMA-2010AE amplifier gives such a nice sub bass. I am at a loss of words.
2. The HD650? One word : SUBLIME on the PMA-2010AE. Treble, mids, and even the bass improved to a new level. I have never heard the cans on such a setup before.

Where is the misnomer? Well, people say that amps above 150$ do not make a huge difference. I beg to differ, the difference is light and day! thumb.gif

I want that MPA-2010 AE AMP so badly now. Told my mate to lock the house next time or I take it biggrin.gif
 
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post #10924 of 38372
By treble being "cut off" are you talking about amplitude (quantity) or something else? Generally people using that language are talking about a frequency response shift, so I just want to confirm.

The FiiO amps are definitely not the absolute top-performing audio gear out there, but their frequency responses are very flat over the audible range, except the E1 which always has a bass boost. Obviously frequency response isn't the only factor, but it's the most important and very easy to verify--and it has been verified. You shouldn't be getting frequencies cut off on such an amplifier, compared to any other amplifier. Other perceptual details are more difficult to define rigorously, but this is pretty straightforward contradiction, if I'm following you correctly.

That is, unless the PMA-2010 AE intentionally boosts the treble above other frequencies. Then obviously other amplifiers would have less treble.
Edited by mikeaj - 12/27/11 at 12:19pm
post #10925 of 38372
hints of output impedance matching. which for a low impedance headphone like the D2000 at 25 ohm, is more than likely.
post #10926 of 38372
It's also not entirely correct to compare a speaker amp that happens to have a headphone jack to headphone amps price wise.
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post #10927 of 38372
^

No, I'd say it's more output impedance issues.
post #10928 of 38372
Quote:
Originally Posted by Crazy9000 View Post

It's also not entirely correct to compare a speaker amp that happens to have a headphone jack to headphone amps price wise.
Quote:
Originally Posted by chinesekiwi View Post

^
No, I'd say it's more output impedance issues.

It's a good point to make though. The headphone output on my £800 speaker amp is no match for the headphone output on my ~£400 headphone amp.
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post #10929 of 38372
Quote:
Originally Posted by chinesekiwi View Post

hints of output impedance matching. which for a low impedance headphone like the D2000 at 25 ohm, is more than likely.

Suppose the Denon amp's headphone out has higher output impedance. That still wouldn't explain extra treble with the AH-D2000, which has very flat impedance, particularly in the treble, even out to 20 kHz (unlike many headphones).

339

Anyhow, the headphone amps on speaker amps are generally either tapped from the real amp (maybe through a resistor, which would be bad) or often just its own afterthought circuit or chip. It should have a disadvantage against dedicated headphone amplifiers. After all, the majority of the cost and the design are for a different purpose.
post #10930 of 38372
it will have lower output impedance than the Fiio E9 at 10 ohm output impedance

the output impedance of an amp is not the same as the headphone impedance

Read here: http://nwavguy.blogspot.com/2011/02/headphone-amp-impedance.html

This is with a 13 ohm earphone into a Fiio E9

FiiO%252520E9%252520Frequency%252520Response%252520Large%252520Jack%252520Ultimate%252520Ears%252520Super%252520Fi%2525205%252520Pro_thumb.png?imgmax=800

With a 25 ohm headphone it won't be an extreme as that but still noticeable.

Notice those symptoms he was talking about 'killed treble' (output impedance of the E9) ... 'better bass' on the Denon due to better headphone damping.
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