How to Choose a Headphone Amp | EVERYTHING YOU SHOULD KNOW!
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Updated 11/25/18
3,459 word post, approx 6-7 min. read
This is part 2 in a series on various studio equipment, what it does, and how to choose!
- How to Choose Studio Headphones
- How to Choose a Headphone Amp (You are here)
- How to Choose a Microphone
- How to Choose a MIDI Keyboard
- How to Choose a Turntable (Coming Soon)
- What are Studio Monitors?
- What does an Audio Interface Do?
- What does an Audio Mixer do?
- What is a Soundcard?
Make sure to pin this Infographic if it helped you, and/or you think it would help someone else!
Hi friend and welcome!
How to choose a headphone amp is such a great question, and it comes up often. Many times we don’t really think about when or why we need one. We just sort of choose based on reviews, or what’s popular. Today I want to really dissect the process from start to finish, and hopefully give you some insight on different scenarios in which you may or may not need one!
So grab a snack, sit back and relax because..
You’ve come to the right place!!
What I will bring you in this guide
- Introduction
- How to choose a headphone amp
- Portable vs. Desktop
- Power Considerations
- Output Impedance of the Amp
- Sensitivity & Impedance
- Some Amp recommendations
- Final Word
So without further ado, lets get started!
Introduction
In your research for the best studio headphones for mixing, the best headphone under $500, etc. you probably came across an unexpected caveat: Needs proper amplification. Oh no! One of the things that discourages me most in my research is finding out that I have to do .. MORE RESEARCH! Lol.
Luckily for you, proper amplification doesn’t need to be such a chore. There are some really affordable, versatile, and quality options out there that consistently come up in reviews. Today I will attempt to concisely lay out some of my favorite options, inform you on when and how you should choose, as well as enlighten you on some of the most logical pairings.
How to Choose a headphone amp
It goes without saying that most of the low end models, ear buds, and generally sub-par offerings don’t need an amp at all. They are just meant to boost certain frequencies and provide a good listening experience for a low price. Sadly, most of the time they completely fail.
Have you ever purchased a $20 pair of headphones from CVS pharmacy and been utterly disappointed when you finally got home and put them on? Me too. It’s an unfortunate fact of life. These consumer grade cans are the worst of the worst. On the flip side, you may have been satisfied as well. I remember my very first Sony MDR V150’s. They were, and still are a pretty decent set, but the headband is famous for snapping under pressure. Sort of like Henry Hill in Goodfellas π
When you get into some of the decent entry level models,Β you still won’t need an amp. The Sennheiser HD 202’s are a similar price, but they are solid. They don’t need one. The Audio Technica ATH M50’s are an entry to mid-level pair, and they don’t need an amp either. Same goes with the Sennheiser HD 280’s.
Keep in mind: An audio interface, while not a headphone amp per se, does function as sort of an all around Amp/DAC for your studio monitors, microphone, headphones, etc. Just don’t purchase one specifically as a headphone amp. We’ll get into what a DAC is in a bit if you aren’t aware!
Portable vs. Desktop
The first question you should ask yourself is:
- Do my headphones need an amp? The simplified answer: If the Impedance is High and/or The Sensitivity is low, you will probably need an amp. Learn more about Impedance:Β What is Headphone Impedance? There’s no concrete answer for “high”, but I would say anything over 100 Ohms needs more power. Even something under 100 Ohms may need it depending on the situation. The K701 and K702 are both great examples of headphones that have a low Sensitivity (around 91db/mW, not to be confused with the 105db/V that you often see listed), and need quite a bit of power to reach their peak. The thing to keep in mind is that most pairings will sound just fine. Don’t get too fancy about it. “If you wanna be fancy, hold your pinky out like this” As far as Sensitivity, anything around 97dB and lower generally needs more power from the Amp to reach optimal loudness (around 110dB is the standard). More on Sensitivity: What is Sensitivity in Headphones?
The second question is:
- Do I need a portable amp or a desktop amp?
Obviously, if you spend a lot of time in an isolated studio or home environment, a desktop amp is essential.
What’s nice is that you could instead purchase a portable amp and it functions in the same way. You can leave it on your desk as you’re listening, or take it on the go. A perfect example is the Oppo HA-2 or FiiO E10K. It’s incredibly versatile and powerful. Learn more: Oppo HA2 Review!
The third question is:
- Do I need a DAC? (Digital to Analog Converter)
Put simply, a DAC converts the 1’s and 0’s from your computer (the digital realm) into the analog sound that you hear, and vice versa. In recording, you scream obscenities (analog) into the microphone, and your computer makes sense out of it digitally for you to edit and EQ later. Learn more about this mind blowing process: Bit Depth vs. Sample Rate.
There’s also an internal DAC in your phone, mobile device, and pretty much anything that outputs sound. Your PC has an internal Soundcard that functions in the same way. What is a Soundcard?
All that said, only invest in a DAC if your Soundcard or existing DAC is poop. You’ll know because the sound will either:
- Not be loud enough.
- Sound like poop.
- Make lots of unnecessary noise/crackling, etc.
For instance, my laptops internal Soundcard does not output at a listenable level. For me to achieve the volume that I’m looking for, some sort of DAC is required. The Amps/DACs that I’m currently demoing or own:
- Schiit Magni/Modi (Own)
- Oppo HA2 (Own)
- FiiO E10K (Demoing)
- JDS Labs cMoy bb (Demoing)
- JDS Labs Element (Demoing)
- JDS Labs Objective 2 (Demoing)
- ifi iDSD Black Label (Demoing)
Amp/DAC combo
Portable
(Digital to analog converter)
What’s great about these is that they provide your headphones with a built in digital to analog converter + amp. Related: What is a USB DAC? The problem with computers is that the manufacturers rarely make audio a main concern. The result? An internal sound card that does a sub-par job of converting signal, and amplifying that signal to a listenable level (Discussed above). In recent years however, I would say it’s definitely gotten better. I use an old Lenovo T510 and I would never plug my headphones right into the 3.5mm jack. For folks with newer technology, an Amp/DAC may not even be needed! For me, an Amp/DAC is mandatory to get:
- A) Loud enough volume
- B) A quality digital to analog conversion
For instance, if I were to plug my headphones into the 3.5mm jack on the side of my laptop, I would be in for a world of pain like Smokey from The Big Lebowski (mark it 8 dude). Well, not so much a world of pain as a really bad listening experience. Noise, latency, interference, and low volume levels can run rampant here.
A good way to know is just try it out! If you’re not satisfied with the internal DAC on your various sources (PC/Laptop/Phone/Tablet), then a good separate Amp/DAC will definitely improve everything across the board.
You’re provided with an exceptional sound card (DAC) and amp at a reasonable price (in
The FiiO E10K to the right is a good example of a nice budget option. I’m really enjoying this amp right now actually with my Sennheiser HD600’s!
- Click here to read some Amazon Reviews!!
- Learn more: FiiO E10K USB DAC Review!!
My Video Review
Please donβt forget to like, comment, and subscribe to my growing channel. Any support is much appreciated! π
Generally speaking, the better your DAC is, the more accurate the sound will be. This doesn’t necessarily mean the sound will be better, but the representation of that sound will be. If the source of your music is bad, then your sound will still be bad. But, if you’re playing music from a good source, a good DAC will improve upon all of the qualities of your music. A good DAC:
- Takes care of the clarity of the sound.
- The definition of the sound.
- Takes care of noise.
- Effectively interpolates gaps left in digital media.
A good example of a Standalone DAC that excels in all areas is the Cambridge Audio DAC Magic 100. It really is magic! I found the A/D conversion absolutely pristine, to the point of extreme excitement like Arnold when he relates the Gym pump to climaxing. π
- Learn more about the DAC Magic 100 here!
If you plan to use it on the go, a lot of the portable models can also run off of battery power in addition to being plug and play USB!
As of late, the portable DAC craze seems to really be taking off. Maybe I had been out of the loop a few years back, but all sorts of brands continue to pop up, and now more than ever before it’s extremely affordable to invest in one.
A great example of a portable Amp/DAC combo is the Audioquest Dragonfly Red. This tiny
You can also use it with your phone paired with the right adapter! Interested in learning more about this bite sized wonder?
Learn more: Audioquest Dragonfly Red Review.
Desktop Amp/DAC
These boys are pretty nifty as well, but are a little bulkier and are meant to be used in studio only. They sort of resemble audio interfaces actually. Well some do. The one above looks like a mini turntable!
The difference is they have a lot less knobs and buttons overall, as they aren’t meant for plugging anything else into (i.e. your mic or studio monitors). What are Studio Monitors?
Another big difference between this and a portable combo is that the DAC and Amp are both stand alone. So to hook them up, the set up would look something like:
Computer/laptop > DAC > Amp > Headphone.
This is a relatively simple way of illustrating it. Amps such as the Magni paired with the Modi DAC sort of “stack” on top of each-other.
They also need a digital to analog converter so that your brain can make sense out of the numbers. It functions much like an audio interface. Related:Β What does an Audio Interface Do? The sound is a jumbled mess until it is converted to a signal that we can process. This signal is meant to be of a much higher quality than your standard built in DAC that comes with your laptop or CPU (as previously discussed).
Here’s an infographic I did explaining how to hook up an Objective 2 from JDS Labs (Standalone) to a DAC and then to your PC.
So how does this relate to the headphones themselves? Let’s find out!
Power Requirements
As an example, a headphone like the 300 Ohm HD600 requires 20mW of power to perform optimally. The Schiit Magni 2 provides 260mW of power into 300 Ohms. You can see why it’s such a valuable piece of equipment. It can effectively power nearly any headphone, and in reality provides much more than is needed in most cases. The newer Magni 3 provides 430mW into the same 300 Ohm load. Wow! That’s a bit of overkill, no?
The takeaway here is to simply make sure that the power output of the Amp in question is sufficient for the headphones Impedance.
You can do this by checking out the specifications of the amp, as most spec sheets will give a rundown of how much power each Ohm rating can receive. For the Magni 3, the list is as follows:
- Maximum Power, 16 ohms: 3W RMS per channel
- Maximum Power, 32 ohms: 2W RMS per channel
- Maximum Power, 50 ohms: 1.3W RMS per channel
- Maximum Power, 300 ohms: 430mW RMS per channel
- Maximum Power, 600 ohms: 230mW RMS per channel
So the Magni 3 actually provides even more power than the 2. Awesome! (I still have the 2).
Output Impedance of the Amp
Another way to determine if your amp will suffice for the headphones in question is to check the output impedance of the amp. A good rule of thumb is to choose amps that have a number as close to zero as possible.
A simple formula is as follows:
- Take the Impedance of the Headphone. In this case we’ll use the HD600, which is 300 Ohms.
- Divide 300/8 to get 37.5.
- Next, check the output impedance of the amp. We’ll use the Schiit Magni 3, which is less than 0.3 Ohms.
- To ensure that the amp in question will work, make sure that the output impedance never exceeds the Headphone Impedance. In our case it doesn’t. 0.3 Ohms is astronomically less than 37.5. We’ve got a winner!
Why does the number 0 even matter?
Simply put, a number close to zero ensures that the amp will always deliver the same (or roughly the same) output into any load. This ensures that the amp is a consistent performer with a variety of headphones. More on this: What is Headphone Impedance?
Sensitivity & Impedance
Do these things even matter? Of course!
Impedance is a great indicator of how much your headphone will resist an electrical load from the amp. When you have a headphone with a high impedance, it’s basically saying, “I don’t WANNA play loud enough!” Lol. So what do we do? Cower away in the corner and hide? Nah homie. We slap those headphones in the face and make them receive power. Just make sure your amp has enough!
Sensitivity matters because it’s an indicator of the current ultimately making the diaphragm inside the driver move, resulting in sound. But Sensitivity is also critical because it indicates how much power will be required from the amp to drive any given headphone to adequate listening levels (discussed previously).
So the lower the Sensitivity of the headphone, the more power it will require from the Amp to reach loudness. The HD600’s at 97dB need 20mW to perform at their peak. A headphone with 105dB needs much less; about 2.5mW. Pretty big difference!
A lot of entry level closed back models have relatively low impedance ratings, and don’t need one, but can benefit from one. The Audio Technica ATH M50x is a good example.
In general, the higher the impedance, the more likely you will need an amp to raise the volume to a listenable level. Why? Because it needs more power.
- less than 100 Ohm: An Amp is not mandatory, but depending on the headphone, could improve the sound a little or a lot.
- greater than 100 Ohm: An Amp is highly recommended, if not outright mandatory for optimal listening.
What is impedance anyway?
To put it simply, there’s a lot of math involved when you really get down to it. And since I’m no Mathematician, we won’t talk about it. Lol. Here’s a video if you’re really interested. Don’t say I didn’t warn you π
Seriously though, impedance is simply the combined resistance and reactivity the headphones present to the amplifier as an electrical load.
- High impedance cans: Need more power to reach an acceptable listening level. They often benefit from an amp.
- Low impedance cans: They may require more current to lower the damping factor between the amp and headphones. Will be driven loud enough from your portable players. The quality of the sound may be dramatically improved with an amp. Just be aware though that pairing a very low impedance can or earbud with an amp is more susceptible to blow out in certain instances. In other words, you won’t even have to turn the dial past 9 or 10 o’clock in most cases.
Tube amp vs. Solid State
Some headphones like the H800 will sound better with tube amplification. Check out this article: Tube amp vs. Solid State for more information!
Some Amp recommendations
Rather than giving you a whole slew of different amps, I’m going to name off a few popular audiophile headphones and then give sort of a “great option” for each. Keep in mind that this is highly subjective, but we’re also dealing with entry level, as well as mid-fi gear. These are Amps/DACS that I’ve come across time and again as solid options. You won’t really need a high priced amp unless you have a high priced can on your hands!
Sennheiser HD 600/650
Impedance: 300 Ohm
- Used for: mixing/reference/casual
- Amp picky: No
- Great options: Magni/Modi combo, JDS Labs Objective 2, Oppo HA-2, Audioquest Dragonfly Red, FiiO E10K.
Check out some more helpful articles regarding these two headphones that I’ve written!
- Sennheiser HD 600 Review
- Sennheiser HD 650 Review
- Sennheiser HD 600 vs. 650
- The Best Headphone Amp for the Sennheiser HD650
Sennheiser HD 598
- Impedance: 50 Ohm
- Used for: mixing/reference/casual
- Amp picky: No
- Great option: Fiio E10K, Audioquest Dragonfly Red, anything that works for the HD600 (above).
Helpful Articles:
Beyerdynamic DT880
- Impedance: 250 Ohm
- Used for: mixing/reference/casual
- Amp picky: No
- Great option: JDS Labs 02, Schiit Magni/Modi, Oppo HA-2.
Helpful articles:
- Beyerdynamic DT 880 Pro, 250 Ohm Review
- Beyerdynamic DT880 vs. Sennheiser HD600
- Beyerdynamic DT 770 vs. 880
Beyerdynamic T1
- Impedance: 600 Ohm
- Used for: critical listening/reference
- Amp picky: Yes
- Great option: Schiit Valhalla.
Helpful articles:
AKG K701 & K702
- Impedance: 62 Ohm
- Used for: mixing/reference
- Amp picky: No
- Great option: Vioelectric V200, Little Dot MKIII.
Helpful articles:
- AKG K701 vs. AKG K702
- AKG K701 vs. DT880
- Sennheiser HD650 vs. AKG K701
- Sennheiser HD600 vs. AKG K701
Final Word
Choosing a headphone amp isn’t really that complicated of a process. Don’t be overwhelmed by the countless Amps/DACS out there. The Schiit, JDS Labs, and FiiO brands will more than suffice for the majority of your higher impedance headphone models. The difficulty comes when you’re purchasing expensive headphones like the Sennheiser HD 800. A set like that is more than amp finicky. It has the potential to sound completely different from amp to amp! A scary thought indeed. Luckily a lot of these entry to mid level audiophile headphones do well with a lot of the same gear.
With that, I would say that the differences from amp to amp aren’t as astronomically large as some people like to claim. There are subtle differences, sure. But Choosing an Amp/DAC should never be a stressful process. Find out the Impedance and Sensitivity of your cans, look at the power output on the Amp, and then just go for it. One amp isn’t going to make your music sound that much better than another. The differences are just too subtle. Most companies use really good DAC chips so it’s not really a big deal.
I would say for most people, the Dragonfly Red from Audioquest is the most practical and pragmatic solution if you’re desiring a true upgrade in sound. You can pair it with your phone or use it with your laptop. It’s super portable and convenient, and the DAC chip inside is fantastic. It makes your music just sound better!
So..
Interested in learning more about it?
CHECK OUT MY OFFICIAL AUDIOQUEST DRAGONFLY RED REVIEW!!
AND
SEE THE GLOWING REVIEWS FOR YOURSELF!!
How about the budget friendly E10K?
FiiO E10K USB DAC REVIEW!
SEE IT FOR YOURSELF ON AMAZON!!
Well that’s about it for today my friend! I hope you have a better idea on how to choose a headphone amp, and came away with some valuable information. Speaking of,
Did I provide enough information? Did this help? Let me know!
If you have any other questions, or felt that I left something out, leave a comment below or Contact me! I very much look forward to speaking with you.
All the best and God bless,
-Stu
Canβt decide which headphones to purchase? Interested in a complete buyers guide outlining over 40 of the best options on the market? Click on over to the best audiophile headphones to learn more!!
Be sure to also check out my Reviews and Resources page for more helpful and informative articles!
About The Author
Stuart Charles Black
Stu is determined to provide the truth about all things audio, and strives to deliver excellent content to you the reader! In his spare time, he likes to fish, paint, play guitar, attend church, take photos, record videos, graphic design, and more. His attention to detail and perfectionist attitude are what allow him to excel, but it can be both a blessing and a hindrance at times.
Nice reviews on this website!
I see that you have used both HD201 and HD202 from Sennheiser. I have HD201, and planning on buying HD202 model, as it is definitely better by many’s opinions.
But.. As I am almost always listening music from my mid-level Asus laptop or Nexus 5 phone, would buying a headphone amp (or building one) would make a difference, as HD202 are only 32ohm?
Also, my laptop’s 3.5mm output is total crap with lots of noise and not that clear sound, would there be a difference with using some kind of DAC instead of on-board sound output?
Hey Alex!
That’s a tough one. I wouldn’t buy an amp for the 202’s, but because your laptops 3.5mm jack is crap, I may consider it. Do you plan on upgrading to a better headphone in the future? If so, the FiiO E10K would be a great place to start as far as a great starter combo amp/DAC. It works well with a lot of different headphones, and because you’re starting out in the entry level range, you have a lot of wiggle room as far as upgrading and still keeping the E10K around.
Hope that helps! If you have any other questions let me know!
Blessings,
-Stu
Would the Magni 2 Uber be a good amp for the Audio Technica ATH-R70X? my DAC will be my sound card (Creative X-FI Titanium HD) and I will also use the amp to plug in my Razer Mako speakers.
Yeah the Magni will do just fine with the R70x. You may also look into the Valhalla 2, since it is capable of more than double the power output into high impedances (>300 Ohms). The Valhalla was made for higher impedance cans, and the R70x comes in at 470 ohms. At the end of the day, you can’t really go wrong with a Schiit amp, so I wouldn’t stress too hard about it. The Magni 2 is a really good amp.
Hope that helps! Let me know if you have any other questions..
Blessings
-Stu
I know you can’t go off of power alone but what so you think about 39mW at 600ohm powering an HD600? 64mW @ 60ohm and 101 @ 30. Talking about the Audient iD14 if you were curious.
I think that’s an excellent choice. I may just have to pick that baby up; I’ve heard a lot of good things about it! It has a ton of features and would more than suffice to power the 600’s.
Finally found this page again. I’ve found with the HD600 that I never go any higher than -20 volume with the id14. I did a little test with the headphones away from my face and it plays cleanly at 0. Upgraditis hits me every once in a while but then I talk myself out of it. More power clearly isn’t what I need.
Yeah man, I too like my music really loud so I’m kind of having to get used to the 600’s sound signature. Really like them but find that they don’t really need to be pushed to the max. Also I heard burn in time is important can you speak to this? I too like to upgrade a lot and have to just chill out lol. How are you liking the id14?
I am using HD 598 for classical music together with Modi 2 DAC and Little dot 1+ which has Mullard M8161 tubes. Will I get significantly better outcome in term of details, sound stage if I use Schiit Asgard 2 or Valhalla 2 as amp (Considering the fact that LD 1+ is not a pure class A amp where as other 2 does)? If so which one of the two will be better (for classical music)?
I may actually go with the Magni + Modi, which is a knock out combo..
Let me know what you think..
Blessings,
-Stu
Hi i wanted to ask if a FiiO E10K Olympus 2 would be great for AKG K612 pro
Yes! It will work just fine. Check out this article on What is Headphone Impedance for more information! In a nutshell, the output impedance of the E10K is less than 1.04. To figure out if your headphones will pair up well, you divide the Impedance of the 612’s (120) by 8, giving you 15. The output impedance of the E10K does not exceed 15, so you’re golden!
Hi
So, is a decent audio interface can be used as an amp? Or is it just ‘better than nothing’ but still need an amp for best quality? I have a steinberg ci2 thinking about buying an AKG K701 or Sennheiser HD 600 or something on that range.
Thanks.
Hey Barry!
It all depends on the output impedance of the interface in question. Basically you divide the impedance of your headphones by 8, and that resulting number should always be higher than the output impedance of the amp or interface. A simple example is the HD600. It has an impedance of 300 Ohms. Divide that by 8. Get 37.5. This number should never be less than the output impedance of an amp or interface. The Focusrite 2i2’s is around 10, while the Schiit Magni’s is less than 0.1. This is why it can drive most headphones without a problem. The problem with the K701 is that it’s amp picky, and there are a select few that will work with it. The 600’s do well with the Magni, as well as the Bottlehead Crack. The K701’s off the top of my head do very well with the Vioelectric V200.
To answer your question, even with the 1/8th rule in effect, a headphone like the M50 still sounds decent to my ears out of an interface, even though it technically shouldn’t. But a headphone like the HD600 as well as the K701 absolutely needs it’s own separate amp. What is Headphone Impedance?
Let me know if that helps!
-Stu
Thanks. It must be my fault, but i don’t get that logic..:) My CI2 interface has 40Ξ© for the phone output impedance. That would mean that it only good for (40X8=) 320ohms or HIGHER (?) impedance headphones? That’s clearly not the case, right? π (right now i’m using a Senhesier HD 555 it has 50 ohm impedance)
Hey Barry!
You don’t multiply, you divide. So divide the impedance by 8, and get 5. That number 5 should always exceed the output impedance of your amp, or put another way, the output impedance of the amp should never be greater than that number (5), or whatever number you get depending on the headphones. What is headphone impedance? That article goes a little more in depth, but you get the basic idea. π
Hope that helps! Let me know if you have any other questions.
-Stu
That 40ohm I mentioned is the impedance of my amp/interface, you don’t want to divide that, you want to divide the impedance number of a headphone right?
Let me ask about my problem through an example:
My amp output impedance is 40 ohms. It’s too high to drive an HD 600 (300/8=37.5 and it is less than the output impedance of my amp)
Then it can not drive for example a pretty cheap, low impedance HD201 (24ohms imp.)? Because 24/8=3 and its even less than the amp’s 40 ohms.
But i guess anything can drive that cheap headphone even simple phones or ipods, right?
Yes, divide the impedance of the headphone. Sorry for the confusion.
Yeah, your amp isn’t sufficient to drive any of those headphones with reasonable accuracy and clarity. Also, a headphone like the 201 doesn’t really need amplification, and will work fine from your mobile devices.
Generally speaking, the closer to zero that your headphone amps output impedance is, the better. For example, the Schiit Magni that I have has an output impedance of less than 0.1. This makes it ideal for nearly all headphones within the entry level to mid-level price range.
Let me know if that helps!
-Stu
Is the Audio Technica ath-r70 470 ohm juxtaposed with fiio e10k strong enough?
Hey Dewbest!
I would invest in something more substantial to be honest. At 470 Ohms and 99dB Sensitivity for the R70, the FiiO E10K is just scraping by. Their recommended impedance ranges from 16-150. Well out of the R70’s territory. I would recommend it if not for the 470 Ohm impedance. I’ve never heard of a headphone that requires that much power. As an example, current wise, the E10K handles an HD600/650 just fine, but it’s kind of the ceiling as far as power and current output. I find myself using the gain switch a lot of the time although it’s not absolutely mandatory. The 600’s Sensitivity sits on the cusp of being low (97dB), and it requires a bit of power at 300 Ohm. For that headphone I may suggest something a bit more powerful given it’s ridiculously high impedance. I would suggest at minimum something like the Magni 2 or 3 for the R70, or a JDS Labs Objective 2.
Let me know what you decide!
-Stu
Hi i wanted to ask if a FiiO E10K Olympus 2 would be good for AKG K702, (62 ohms)
Hey Gustavo!
My last reply didn’t take into account that the 702’s actual Sensitivity is 91dB/mW. The number I cited was 105, but it’s in db/V. Huge difference. Not sure why AKG lists that number when the K702 is similar to a K240 as far as Sensitivity and power requirements.
The E10K did very well with the 97dB HD600, but the K702 is going to need more power from the amp to reach acceptable levels.
I know this was from August, but let me know if you’ve already purchased something or need a hand.
-Stu
Is the ‘micro iDSD Black Label’ a good choice for the Sennheiser HD 600?
Hey June!!
Should be more than enough power. The Black Label provides 100mW into 300 Ohm and the HD600 only needs 30. The amp also has an output impedance of less than 1 which means it will work with the vast majority of headphones. Sounds like a great product! Please let me know how you like the amp and if you would be willing to lend it to me someday down the road when you’ve gotten “amp”le time with it. Haha! Have you heard about the Chord Mojo? Best Amp/DAC combo I’ve heard so far.
Best regards,
-Stu