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2/6/21. Article/link cleanup. Removed cMoy as it’s no longer in production from JDS Labs. Removed Magni 2 because it’s a crappy outdated Amp. The article still needs an additional overhaul. For now, check out The Best Headphone Amp For The Money
2,775-word post, approx. 7-8 min read.
Hey there friend, and Welcome aboard!!
Before we get into the Best Headphone Amp Under $100, grab a snack, sit back and relax because…
You’ve come to the right place!!
Image coming soon!
What I will bring you in this article
How to determine if you need an Amp
How to determine if you need a DAC
Now without further ado, let’s get rolling!!
There is an abundance of headphone amps out there for under $100, but not all of them are even worth your attention.
My philosophy is that generally speaking, anything with under 4 stars on Amazon is poop. I have personally never bought a product with that rating, and I don’t plan on doing it any time soon. It has worked for me, and because of that, I’ve never returned a piece of gear because it broke down.
The other issue is that a lot of websites tend to list out every single option (or most) for under $100, even the bad ones. This only ends up causing a lot of confusion, and today we will try to avoid that at all costs (no pun intended).
It’s easy to get caught up in the sea of amps available, but most of the time they are completely unnecessary. In my opinion, there’s too much of an influx of gear out there that it really just ends up overwhelming folks to the point of “analysis paralysis.” This is a term used in the fitness industry a lot due to the sheer amount of “experts”, all telling you to buy their products and do their methods because “this is what works,” not that.
The same sort of thing goes on with the music production side of things because every company that sells an amp is going to tell you what you want to hear, rather than the reality.
What is the reality?
That all products are flawed no matter how you slice them. It becomes a matter of making trade-offs and sacrifices and accepting that you’re never going to be completely 100% satisfied with anything you buy.
A prime example is the Sony MDR V6. This is my go-to headphone 99% of the time, and I will likely never sell it because it’s so valuable and has an incredible price to performance ratio.
That said, there are a few things that really annoy me about it:
Its ear pads are infamous for breaking down, flaking, and peeling to a startling degree. Luckily they are replaceable.
The coiled cord is annoying and is prone to tangling pretty badly after a year or two of heavy studio use.
It doesn’t have a replaceable cable or an option for a straight cable without a DIY project.
Other than that, the headphone is the easiest recommendation I could ever make.
Another example is something like an Audeze LCD series headphone. Sound-wise, they are some of the best on the planet. Perfect bass response, balanced/flat mid-range, and a semi-dark treble that sounds heavenly and never too bright. Here’s a good graph of my favorite, the LCD-X. It’s liquid and smooth baby!
When you put them on, it feels like you’re literally wearing a size 8 bowling ball. No joke.
But what about Amps?
Amps suffer from this same sort of phenomenon but in a different way. The problem is that there are simply too many to choose from in this category, and most will break down over time because of how cheap they are sold for.
This is why I like to recommend the high end of the price range, i.e. just a hair under $100. I personally would never buy one for like $25 unless it was for strictly testing purposes and it had at least a 4-star rating with plenty of reviews.
The FiiO E6 dances around these parameters, but I still don’t see the point in buying it when you could save some more money and get something much better.
Please keep in mind these are my personal opinions/experiences, and they’re not necessarily right or wrong. It’s just the way I prefer handling things. Like I said before, my methods haven’t failed me. I’ve been purchasing audio gear since around 2007. Not once have I returned a product using this protocol of:
The product must be over 4 stars, and preferably at least 4.4/4.5.
The product must be researched thoroughly from a bevy of websites and reviews.
It’s really that simple. There are some exceptions to this rule though. Sometimes reviewers have no idea what they are talking about. Sometimes they gave a poor review and didn’t specify why. Sometimes they gave a poor review and their claims turned out to be wrong. Often times there’s just not enough reviews for a good Consensus. I do my best to take all this and more into account. Generally speaking though, I won’t buy anything on Amazon if it’s not at least 4 stars.
But I digress…
How will you know if you need an Amp/DAC?
How to determine if you need an Amp
Power and Current
A simple way of looking at it is that lower sensitivity headphones need current to make the diaphragm inside the driver move (resulting in sound), but they also need more power from the amp to reach optimal loudness levels (around 110dB is the standard). A higher Sensitivity headphone doesn’t need as much. What is Sensitivity in Headphones?
As an example, a headphone like the 300 Ohm HD600 has a Sensitivity of 97dB and needs about 20mW of power from the amp to reach peak loudness. Something like the Oppo HA2 provides 30mW into 300 Ohm, so it just makes the cut. This is also why it’s important to know the power output of the Amp in question.
A headphone with a higher Sensitivity (something like 105dB) only needs 2.5mW of power from the amp to perform optimally. You can see the difference!
On the flip side of that, consider the FiiO E6.
It only outputs 16mW into 300 Ohm and is only good for low impedance headphones.
The Dragonfly Red outputs 2.1 Volts, and will effectively work with 99% of headphones. The Dragonfly Black outputs 1.2 Volts, and is a bit more limited but still tends to outperform an E6.
So the question is, why even bother with the E6? The answer is that you should just save some more money and go with something else.
So in the case of Impedance and Sensitivity, numbers do matter. A lot. They make all the difference in knowing just how much power you’re going to need for any headphone in question. It’s also important because it saves you money in the long run. If your headphone doesn’t need a lot of power, it makes no sense to buy an expensive amp that supplies a lot of it.
On the flip side, an Amp like Objective 2 is so valuable because its output impedance is close to zero, it’s dirt cheap, and it’s super powerful meaning it has enough to drive basically any headphone, completely free of distortion. This is why I recommend it all the time to people. It’s an investment that will serve you well for a long time. If you decide to upgrade headphones down the road to something with a Higher Impedance and Low Sensitivity, Objective 2 will still be there, ready to help.
A good analogy of current and voltage (power) would be the following:
Think of current as the volume of water in a bucket.
Think of voltage as the water pressure (PSI).
Think of impedance as the size of the hose nozzle.
A high impedance headphone = Tiny nozzle. They need a lot of voltage (pressure) or power to function properly.
A low impedance headphone = Is like filling a bucket with water. It requires more flow (current) but not a lot of pressure (voltage).
You can also go by an Amp’s output impedance, and use the 1/8th rule.
Some will say that because old school equipment/receivers have a higher output impedance but still work really well with headphones, the philosophy or methodology is thus false and the number 0 in this scenario doesn’t really matter.
For me, this wasn’t true with the HD600 out of my dad’s receiver. The sound was pretty bad and in no way ideal.
Professional grade headphones just won’t cut it because the higher output impedance from the source results in a drop in voltage to the headphones themselves. This manifests in lower impedance models especially, to the extent that a source with 50 Ohms of Output Impedance can’t even power a 32 Ohm headphone! That’s not ideal.
A lowoutput impedance (close to zero) means that the Amp in question will deliver the same amount of power regardless of the Impedance load from the headphones.
A higher output impedance might the power to the headphone will change and behave erratically which mirrors my experience with the HD600 out of a standard receiver. However, this isn’t always the case. The HD600’s do sound fantastic out of my old Panasonic SA AK403. I’m pretty sure the output impedance on that model is fairly high, but I’m not entirely sure.
NwAvGuy (Northwest Audio Visual Guy) who is responsible for the creation of the fantastic JDS Labs 02 Amplifier wrote a great article on this.
The calculation for this method is fairly straightforward:
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!
Your PC’s internal DAC (Soundcard) doesn’t produce a sound that’s loud enough.
The second was my major issue with my Lenovo T510. Even plugging in a headphone with high sensitivity gave me issues in the volume level not sufficing. What is Sensitivity in Headphones?
Back in 2014, my remedy was to buy an audio interface and hook it up to some Studio Monitors. The interface also acts as an Amp/DAC for your headphones and results in a much better sound than the one out of your standard PC or laptop. What does an audio interface do?
Even despite the fact that the Scarlett 2i2’s output impedance is about 10, it still works pretty well with lower impedance headphones. I did notice a difference in comparing the sound quality out of it vs. an amp proper like the Schiit Magni.
That said, I bought the Interface at that time specifically to plug in a condenser microphone and also to power my studio monitors. What are Studio Monitors?
The added benefit of plugging in headphones was simply the cherry on top.
Fortunately, most machines and phones nowadays have pretty good internal Soundcards, so you may not even need a DAC.
The good news is that adding one of these will only benefit you in the long run, especially if you decide to add more headphones and/or upgrade in the future.
The best way to find out is just to buy a set of headphones and evaluate the sound. If you’re not satisfied, an Amp/DAC combo is the best solution.
That segways perfectly into Amps & DACS below $100 that is worth the investment.
This beast was designed and built by NwAvGuy (Northwest Audio Video Guy) and has been praised the world over. It’s one of the most sought after amps around the internet and for good reason. I got a chance to demo one and the sound provided through the amp is incredibly clean, crisp, and neutral. With an output impedance of 0.54 Ohms, it will power nearly all headphones without issue. I do prefer this over a Magni 2, but the differences are ever so subtle and it may just be my imagination.
Please keep in mind that the Amps themselves are just under $100, but with an added DAC (required) the price goes up.
For under $100 this is my top recommendation easily. The sound quality is comparable to most everything I’ve heard, including a Schiit Magni, Audioengine D1, 02, and Dragonfly Red. It’s not quite as powerful as a Schiit stack, but for the majority of situations you’ll be fine and you may not even be able to tell a difference with a headphone like the Sennheiser HD600. Learn more:Sennheiser HD600 Review! I had no trouble powering my 600’s with it, and the overall character of the amp is very crisp, neutral, and clean. I had so much fun with it that I didn’t want to take my headphones off actually. Right now I have it paired with a MrSpeakers Aeon Flow and the sound is excellent. This baby is a lot more capable than people give it credit for. It should keep you satisfied and content for quite a while before you decide to upgrade.
This is a great #2 recommendation for under $100, as it’s portable, convenient, and roughly the size of a Tic-Tac. Well not that small, but you get the idea. It can go anywhere, much like a real Dragonfly! Learn more:Audioquest Dragonfly Red vs. Black.
The reason I put this at #1 is because of the almost impeccable sound quality, portability, versatility, and price to performance ratio. Also learn more about the Dragonfly Red:Audioquest Dragonfly Red Review! Use it with your phone or laptop/PC.
Stu is determined to help you make sound decisions, and strives to deliver the best and most in depth content on the internet! In his spare time, he likes to fish, paint, play guitar, pray, rap, make beats, take photos, record videos, graphic design, and more. His sense of humour, coupled with a knack for excellence and strict attention to detail are what allow him to stand out in an crowded industry.