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JDS Labs C5/C5D (pg96) portable amp/amp+DAC
miceblue: those frequency response variations are typical of high output impedance combined with non-flat impedance curve from the IEMs, which is very common with BA IEMs. To avoid those variations (which distort the audio), you want to plug them into a headphone out with an output impedance...- skamp
- Post #2,773
- Forum: Portable Headphone Amps
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FiiO Mont Blanc/E12 portable headphone amp, 880mW, slim design, full metal case. Bass boost and Cross feed!
Actually, voltage requirements being equal, lower impedance headphones are harder to drive, because: they require more current than higher impedance headphones they require smaller output impedance in order to be driven properly (e.g. 18 / 8 = 2.25Ω), which limits the number of suitable...- skamp
- Post #3,122
- Forum: Portable Headphone Amps
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Pictures of Your *Budget-Fi* Portable Rig (< $200)
Shure SE425, and Bose QC15 headphones- skamp
- Post #1,639
- Forum: Portable Source Gear
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Pictures of Your *Budget-Fi* Portable Rig (< $200)
Not that my Clip+ or headphones or IEMs need an amp, but it's a nice amp! (Topping NX1)- skamp
- Post #1,637
- Forum: Portable Source Gear
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The Fiio X5 Thread
What standard? The X5 is rated at 1.5 Vrms, the X3 at 1.7 Vrms; "Consumer audio" is about 0.3 Vrms, "professional audio" is about 1.2 Vrms, a CD player is 2 Vrms, an iPod Classic is about 0.83 Vrms, a Clip+ is about 0.5 Vrms, and my Sony Xperia Z1 smartphone does about 0.13 Vrms. As you can see...- skamp
- Post #12,458
- Forum: Portable Source Gear
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JDS Labs C5/C5D (pg96) portable amp/amp+DAC
He did already:- skamp
- Post #2,736
- Forum: Portable Headphone Amps
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IEM's with iPod Classic
With the iPod's output impedance of 5.5Ω, ideally, you want headphones / IEMs with impedance that is at least 8 times higher, i.e. 44Ω. Your IEMs are rated at 47Ω (and they're fairly sensitive, too, at 106 dB/mW), so they're a perfect match.- skamp
- Post #2
- Forum: Introductions, Help and Recommendations
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JDS Labs C5/C5D (pg96) portable amp/amp+DAC
Sorry, but you're doing it wrong. You complain about "quite loud hiss": this is why. High gain with those IEMs will make them sound worse, not better. I can only imagine the sheer effort required to push a button…- skamp
- Post #2,732
- Forum: Portable Headphone Amps
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JDS Labs C5/C5D (pg96) portable amp/amp+DAC
You definitely don't want to set the C5 to high gain with those IEMs, ever.- skamp
- Post #2,730
- Forum: Portable Headphone Amps
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JDS Labs C5/C5D (pg96) portable amp/amp+DAC
I don't understand the point of such ridiculously high sensitivity. It's more of a flaw than anything else.- skamp
- Post #2,727
- Forum: Portable Headphone Amps
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TOPPING NX1 Portable Headphone Amplifier Impressions Thread
Is the amp set to low gain? That's a ground loop. You can try a ground loop isolator (search on Amazon or whatever).- skamp
- Post #913
- Forum: Portable Headphone Amps
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Mo-Fi Headphones from Blue Microphones: Multi-link, Amplified Headphone Goodness - Head-Fi TV
It still is an actual problem, yes. Many devices still have excessively high output impedance (10-100 ohms, like smartphones, tablets, computers, as well as other devices with a headphone out, such as active desktop speakers). Some devices also have very weak output (notably, certain...- skamp
- Post #182
- Forum: Headphones (full-size)
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TOPPING NX1 Portable Headphone Amplifier Impressions Thread
There's a red LED at the back that lights up when charging, and turns off when it's done.- skamp
- Post #815
- Forum: Portable Headphone Amps
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Mo-Fi Headphones from Blue Microphones: Multi-link, Amplified Headphone Goodness - Head-Fi TV
4) it saves a lot of bulk and cables and inconvenience of an external amp- skamp
- Post #74
- Forum: Headphones (full-size)
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Mo-Fi Headphones from Blue Microphones: Multi-link, Amplified Headphone Goodness - Head-Fi TV
"I think we'll just have to settle with turning the amp off if we want the rest of the package." I meant, why are you dismissing the built-in amplifier.- skamp
- Post #66
- Forum: Headphones (full-size)
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Mo-Fi Headphones from Blue Microphones: Multi-link, Amplified Headphone Goodness - Head-Fi TV
Nope, it's already marketed as audiophile: "Custom high-powered audiophile amplifier" Why are you dismissing it out of hand?- skamp
- Post #62
- Forum: Headphones (full-size)
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The FiiO X1 Discussion and Help and Support Thread |192K/24B|100mW | LO | inline remote
And what is my ban-able offense?- skamp
- Post #1,644
- Forum: Portable Source Gear
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The FiiO X1 Discussion and Help and Support Thread |192K/24B|100mW | LO | inline remote
The O2 isn't as special as you think. It's just a good amp. There are other good amps.- skamp
- Post #1,642
- Forum: Portable Source Gear
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The FiiO X1 Discussion and Help and Support Thread |192K/24B|100mW | LO | inline remote
Because they would be bored if they didn't. Yes. No, it does not. A good amp is fully transparent, it doesn't add anything - unless it has specific functions to alter the source, like a bass boost or crossfeed function.- skamp
- Post #1,637
- Forum: Portable Source Gear
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The Fiio X5 Thread
Thing is, this is 2014, not 1999, when the first MP3 players were emerging. I can't think of a good reason why a modern DAP shouldn't be feature complete.- skamp
- Post #11,877
- Forum: Portable Source Gear
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The Fiio X5 Thread
It seems to me that people bitching about the firmware would be better off with a Rockboxed device. Has anyone measured the X5 to see if its output is really superior to an iPod Classic or a Clip+? Even the Classic is cheaper than the X5...- skamp
- Post #11,875
- Forum: Portable Source Gear
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TOPPING NX1 Portable Headphone Amplifier Impressions Thread
Definitely more predictable than random impedance interaction with various gear.- skamp
- Post #728
- Forum: Portable Headphone Amps
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TOPPING NX1 Portable Headphone Amplifier Impressions Thread
A lot, actually. If you're still talking about impedance curve, that is.- skamp
- Post #726
- Forum: Portable Headphone Amps
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TOPPING NX1 Portable Headphone Amplifier Impressions Thread
That would be an adverse effect of high output impedance and non-flat headphone impedance. Wether you like it or not, it's a defect from what the source is supposed to sound like, what the amp is supposed to sound like, and what the headphones are supposed to sound like. Moreover, that effect...- skamp
- Post #722
- Forum: Portable Headphone Amps
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TOPPING NX1 Portable Headphone Amplifier Impressions Thread
There is no reason to spend more money on an amp, unless it brings you something more, like higher output, or a bass boost function, or anything. Some amps may measure even better, but the lower distortion and / or higher signal to noise ratio (SNR) may be inaudible. One area in particular...- skamp
- Post #715
- Forum: Portable Headphone Amps