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AMP Question

post #1 of 8
Thread Starter 
Hey guys, I am about to purchase this set I have decided on, thanks to another thread... "high end computer speakers"... but here is the amp...
Dayton DTA 100a for a pair of Dayton B652 bookshelf speakers... and eventually a sub...
http://www.amazon.com/Dayton-DTA-100a-Class-T-Digital-Amplifier/dp/B004JK8BDK/ref=sr_1_1?ie=UTF8&qid=1331245171&sr=8-1

Is this amp good for my pair of Ultimate Ears Triple Fi 10's? I use these IEM's on my Samsung Galaxy S II and iPad without an amp and don't know if I am getting the full effect and am wondering if something like this will be significantly different?
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post #2 of 8
Possibly?

It's a "Class T" amplifier, which is really a proprietary Class D implementation. I think the Class D ICs tend to include some kind of integrated headphone amplifier separate from the actual speaker amplifier circuit (that's better than using the speaker circuit). I could be way off target for this product though. Regardless, for something like this, the headphone amplifier part is kind of an afterthought, but it might still be pretty good.

UE TripleFi 10 is a triple (well duh) balanced armature design with a passive crossover. These things are very sensitive to differences in amplifier output impedance: the frequency response will actually significantly change as a result of different output impedance. Does it sound different to you on the Galaxy S II as opposed to the iPad?

I don't know how you want to define "full effect" but there may be significant differences to be had, just because of the impedance issues. If you're curious, something like a ~$20 FiiO E5 or E6 has negligibly low output impedance and would arguably tell you what the "actual" frequency response of the IEMs are, which may or may not sound better to you than whatever it is you're using now. It's known that the Galaxy S II has something like 50 ohms output impedance, which should significantly alter the balance of the IEMs, relative to a device with close to 0 ohms output impedance. There are definitely other factors at play as well, but this should be the most important.
Edited by mikeaj - 3/8/12 at 2:52pm
post #3 of 8
Thread Starter 
Quote:
Originally Posted by mikeaj View Post

Possibly?
It's a "Class T" amplifier, which is really a proprietary Class D implementation. I think the Class D ICs tend to include some kind of integrated headphone amplifier separate from the actual speaker amplifier circuit (that's better than using the speaker circuit). I could be way off target for this product though. Regardless, for something like this, the headphone amplifier part is kind of an afterthought, but it might still be pretty good.
UE TripleFi 10 is a triple (well duh) balanced armature design with a passive crossover. These things are very sensitive to differences in amplifier output impedance: the frequency response will actually significantly change as a result of different output impedance. Does it sound different to you on the Galaxy S II as opposed to the iPad?
I don't know how you want to define "full effect" but there may be significant differences to be had, just because of the impedance issues. There are other factors at play as well, but this should be the most important.

Thanks,
I listen to music with excessive highs and lows and don't care much about mids (which I know is famous for on the TF10's) but it does sound different on the Galaxy S II and the iPad... If I turn on the "Techno" or "Rock" equalizer to my better liking on both devices, the Galaxy S II produces that "HISS" noise on particular music (like guitars), and to get rid of it, I have to turn the eq. completely off which annoys me. This only happens on the Galaxy S II and not the iPad...
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post #4 of 8
Sorry for the sloppy posting and then editing. There's more details above now.

Some software equalizers are not that good and do some nasty things to the sound, while others are pretty benign. It really depends. With the Galaxy S II, do you feel like the treble is louder or softer? What changes are the EQ presets making? (does it graphically show?) I never use any of the EQ presets in anything, but I would guess that techno would boost bass and treble, and that makes sense if that's what you prefer.
post #5 of 8
Thread Starter 
I appreciate your help... +rep

But it definitely sounds 'louder' with the treble. Also I use the program PowerAMP since it plays FLAC audio and supports seamless fading into the next track...

700
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post #6 of 8
Thread Starter 
nevermind, the ipad makes the hissing sound too, just the song I guess... here is the song I used to test, in 320kbps mp3 of course...


These triple fi 10's sound sooo clear and have an 'atmospheric' effect that I do not get from any other headset/phone/monitor, and I used to own Etymotic HF3's (dual driver) and of course my Logitech G930 gaming headset doesn't compare for stereo music...

I am going to order the DTA 100a amp and see if it makes any difference, but will also be looking for an over the ear headset, with a bit more clean but strong bass than the TF10's, because I know IEM's are meant for audio directly from the source...
I appreciate any suggestions on a good pair as I am still a newbie to the audiophile world...
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post #7 of 8
Quote:
Originally Posted by Chris13002 View Post

I appreciate your help... +rep
But it definitely sounds 'louder' with the treble. Also I use the program PowerAMP since it plays FLAC audio and supports seamless fading into the next track...

The Galaxy S II has louder treble (without any EQ)? If the output impedance is higher (maybe the hardware in different S II revisions is different), the treble should be reduced for the TripleFi 10, at least according to this graph, if it's correct:
362
Impedance vs. frequency for Ultimate Ears TripleFi 10

http://www.laaudiofile.com/ue_triple_fi_10.html

The voltage seen by the headphones is going to be V_L = V_s * Z_L / (Z_L + Z_s)
V_L = voltage the load sees (the higher this is, the higher the volume)
V_s = voltage output by the source (music player hardware)
Z_L = impedance of the headphones/earphones, which is a function of frequency, as you see above
Z_s = source output impedance, which is more or less a constant over frequency

Hopefully from that it should be clear that if Z_s is not negligible compared to Z_L and Z_L varies over frequency, then V_L will correspondingly vary over frequency. For frequencies where Z_L is higher, V_L will be relatively high. For frequencies where Z_L is lower like the treble in the above graph, V_L will be relatively low so you get less volume there. The effect is an unintentional EQ from the hardware itself (on top of any EQ in software) interacting with the TripleFi 10.

Like I mentioned earlier, if you're curious about that, all it takes is about $20 to buy and try a FiiO E5, which has a Z_s less than 1 ohm and fairly respectable distortion and noise performance, especially considering the cost.
post #8 of 8
Thread Starter 
Quote:
Originally Posted by mikeaj View Post

The Galaxy S II has louder treble (without any EQ)? If the output impedance is higher (maybe the hardware in different S II revisions is different), the treble should be reduced for the TripleFi 10, at least according to this graph, if it's correct:
362
Impedance vs. frequency for Ultimate Ears TripleFi 10
http://www.laaudiofile.com/ue_triple_fi_10.html
The voltage seen by the headphones is going to be V_L = V_s * Z_L / (Z_L + Z_s)
V_L = voltage the load sees (the higher this is, the higher the volume)
V_s = voltage output by the source (music player hardware)
Z_L = impedance of the headphones/earphones, which is a function of frequency, as you see above
Z_s = source output impedance, which is more or less a constant over frequency
Hopefully from that it should be clear that if Z_s is not negligible compared to Z_L and Z_L varies over frequency, then V_L will correspondingly vary over frequency. For frequencies where Z_L is higher, V_L will be relatively high. For frequencies where Z_L is lower like the treble in the above graph, V_L will be relatively low so you get less volume there. The effect is an unintentional EQ from the hardware itself (on top of any EQ in software) interacting with the TripleFi 10.
Like I mentioned earlier, if you're curious about that, all it takes is about $20 to buy and try a FiiO E5, which has a Z_s less than 1 ohm and fairly respectable distortion and noise performance, especially considering the cost.

I finally got to picking up the FiiO E5 and this little amplifier does make a difference... Everything is simply more louder, crisper and clear...

The amplifier has 4 settings and correct me if I am wrong...
1st (no light) - seems to make everything louder
2nd (red) - low end boost - higher bass and sounds more 'muddy'
3rd (blue) - slightly higher bass and highs - most people prefer this setting
4th (purple) - I read a .3db decrease for 'High Output' devices...

I am still using PowerAmp as my music player with an equalizer preset to 'Techno' - raised lower and highs...
And if I use any of the first 3 settings, it gets distortion on particular songs like a busted speaker... and i'll be damned if a tweeter on my $400 pair of monitors are busted...
The 4th setting therefore seems to work the best and no distortion...
I am playing around with all of the combinations and will eventually test the amp on my iPad later on...
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