I realize the specs say " Recommend headphones with impedance between 32 Ohm to 600 Ohm." but can this be used with 24ohm headphones?
1724852
Most headphones used with portable electronics are low impedance, around 32 ohms. The lower ohms make it easier for the amp to drive them. Headphones range in impedance from 16 ohms to 600 ohms. There can be some significant advantages to higher impedance headphones. A higher impedance allows for more turns of wire to be used in the voice coil of the driver. This can result in a better "motor system" with fewer compromises resulting in better overall sound. Higher impedance headphones also require less current to drive and that typically reduces distortion in multiple ways. The amplifiers driving headphone nearly always produce lower distortion into higher impedances. The difference between 24 ohm and 32 ohm is quite negligible. The "24 ohm" is somewhat of an odd number in terms of ohms as typically, you will find 16 and then 32. You shouldn't have any problem using the 24 ohm but you will likely get a better response from headphones rated at higher ohms. You don't state the type of headphones. If you have headphones designed for portable consumer use that have an impedance of 80 ohms or less, it's very likely the manufacture designed them to be driven directly from a typical device like an iPod. Using an amp or DAC with such headphones usually won't improve their sound much, and might even make them sound worse or create other problems like excess noise and channel balance issues. This is especially true if your headphones already get loud enough for your tastes. Generally, 16 - 32 ohm headphones with a sensitivity rating of at least 100 dB/mW do not need an amplifier.
1366764
Pretty much any normal head phones will work just fine. Anything up to 250 Ohm will be fine, unless they are very inefficient like planar headphones. Or some high efficiency ones above 250 will be fine, also.
949102
With ease. I use the HD 800 with it. Plenty of power and to spare. An additional headphone amp would be redundant and likely degrading of sound. And I own the list of HP amps. You name it, I own it. The AK240 is truly a standalone player.
2092117
FiiO E6 handles 32 to 64 ohm headphones quite well. I use it with a FiiO L9L line out dock for IPhone and another line out dock for Sony. I am not familiar with your devices but the E6 more than amply boosts and improves the line-out signals from my MP3s. Clarity and musicality vastly improve. I hardly use the output jack of Apple anymore after hearing what the E6 can do. Even the Sony, which has a better headphone output and a graphic equalizer benefits from the E6 boost. Good Luck!!
1174396
If the headphones are of decent quality, you dont have to worry. This amp should not have enough power to damage quality headphones. They work fine with my Momentum and AKGs fine
2134810
The marketing mumbo jumbo that John quotes sounds nice but is false when it says "features the ability to properly drive the widest variety of headphone types, regardless of impedance or sensitivity". It will not "properly" drive all headphone types. In fact I think it is under-powered for any headphones over 50 ohms impedance. I tested it with my apple ear buds and half volume is about as loud as I would want to go but with my 50 ohm headphones I have the volume maxed out and wish I could go higher. So the honest truth is that they really skimped on the headphone amplifier on this product. The best review I have found on this product is from Don Disbennett at hometheaterhifi and he talks about this as well from his testing with HD598 headphones. The companion amplifier, PM6005, has a great headphone amplifier section that can drive any headphones however.
1748923
Not the 250 ohm. If you want to use them with a phone, I'd suggest the 32 Ohm version; get the Limited Edition if you can find them, they are nice. But if you are using a phone as your primary source, and want something on par SQ wise and more portable, check out the Sennheiser HD25 or Amperior. Both are more easily driven, and more portable too, with a similar V-shaped response to the DT770. Their sound is less spacious, but I prefer them to the DT770 when both are driven by my Nexus 4 (same chipset as your optimus G).
2185919
This appears to be microphone level or at best line level inputs and outputs. Sadly the description doesn't say what the levels or impedances are, but the example in the text implies this. Headphones & speakers are very low impedance and much higher power (wattage) than mic or line levels, so I would be very surprised if you could heard anything, let along acceptable volume and tone, if you directly connect headphones, which would also require at least a mono/stereo adapter.
1386824
I dont know the impedance of the qc15's, but if the ohms are 50 or less, i dont think the e17 would help very much. Low impedance headphones usually do not require much help from amp/dacs. I really can only talk about the e07...only slight improvement due to bass boost when plugged in to my PC/i Tunes. My Acer PC seems to power my sennheiser 598 or Audio tech ATH-50's very well. If you are using i-phone or Gallaxy mobile devices, portable amp/dac is essential. I hope this was helpful.
1369702
Yes definitely. M50 has an impedance of 38 ohm but those "unprofessional" music output are mostly designed for earphones less than 32 ohm (preferably 16 ohm). If you're using a DAP such as DX90 instead of an iPod for M50, you'll notice that the player has better control of the music, more detail, bouncy and more punchy but at the sometime precise bass (drums). This is my experience as I have the same equipment you have.
1454037
There is a Monitor dial that you can use to turn up the volume for your earbuds. I use 64 ohm over-the-ear headphones and it pushes enough power for those.
1295930
It's an active amp which is why it plugs into a wall outlet. It amplifies the signal from the input and splits it into each output, and it has plenty of cojones to drive my over-ear phones into heavy distortion. I assume that's what you mean by "drive." Not sure what you mean by "how many Ohms can it handle". Headphones are generally low watt, high impedance--like 40+ ohm. I personally wouldn't try to drive a low impedance load like a speaker with it.
1270813
Oh yes, they should give you all the volume you can take. From the start they sound great and then get even better as they break in. Just keep in mind that their impedance is 8 ohms.
1986016
I'm probably not the best person to answer your question because I drive my headphones with one of two tube driven amps, but I'll help. The Emotiva headphone amp/DAC will drive almost any headphone easily. The Fiio E7 may or may not be adequate for the 300ohm HD600s. Check the Fiio website for specs and look for a suitable range of headphone impedances (if listed) for this amp/DAC. Also, check head-fi.org or innerfidelity.com for more info on headphones amps/DACs where you can find reviews. Sometimes an amp/DAC will recommend a headphone impedance range and a reviewer will have a very positive review of headphones NOT within that range - YMMV. Good Luck.
1368939
From what I read the amp is pretty good as well and could handle phones up to the HD650, which are 300 ohms I believe,. The DT 880s come in 32, 250 and 600 ohms models. So depending upon your model, the 600 Ohms would work, but would push the perfomance a bit. Some people with 600ohms headphones would still buy the Fostex for portability, and then might have a desktop amp at home. The opinion i gave is a uer's experience in the Head-Fi forum.
1603431
Thanks for the replies. Will keep it in mind when I am ready to buy a headphone amp.
2231518
I no longer have this unit. I believe so at 4 ohms but I suggest you refer to Audio Source Tech Support: 1.877.715.5439 or locally 503.914.4688