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AudioKnow-how 1734

When and why you need headphone amplifiers

The better your headphones are, the more they need the right power supply. Headphone amplifiers can be just what you’re looking for. They deliver more powerful sound, which is beneficial for your ears in many ways.

Headphones can never be good enough; any ear specialist will confirm bad headphones harm your ears. And once the damage is done to the outer or inner part of your ear, you’ve pretty much had it.

For the most part, it’s not the volume itself that wreaks havoc with the sensitive cells in your inner ear. Unless, of course, you’re constantly subjected to hammer drill levels – in which case you’d expect significant and rapid damage. But in some situations, volume is a more complicated matter. Distortion is one of the main things that can make subjectively experienced volume unbearable. Meanwhile, distortion-free, clear sounds can still be pleasant at very high levels. As a rule of thumb, painful levels are more dangerous than pleasant ones.

Why do you need headphone amplifiers in the first place?

And that’s where headphone amplifiers come in. Whether you can see them or not, they’re in every device that has a headphone jack (3.5 or 6.3 mm). The bad news is that in most smartphones, tablets and computers, the amplifiers in the jacks are cheap and shoddy. They just use a thrifty operational amplifier that won’t have set the company back more than 30 centimes. Why? Because manufacturers want to cut costs and they want their mobile devices to use as little power as possible.

If you don’t listen to loud music, struggle to listen to loud music or don’t listen to loud music for long periods of time because swollen, imprecise bass; unintelligible voice audio and hissing or hollow treble quite simply get on your nerves you’re best to buy a good set of headphones. And then give immediate thought to headphone amplifiers – ones that are appropriate for their intended use.

Mobile entertainment

I hardly need to state the obvious: any extraneous wires or bits and bobs flapping about next to your smartphone just get on your nerves when you’re exercising. The prerequisite for listening outdoors is something called low impedance headphones. They don’t zap as much energy from supply batteries and rechargeable batteries. The packaging and description quotes values between 10 and 50 ohms.

I hardly need to state the obvious: any extraneous wires or bits and bobs flapping about next to your smartphone just get on your nerves when you’re exercising. The prerequisite for listening outdoors is something called low impedance headphones. They don’t zap as much energy from supply batteries and rechargeable batteries. The packaging and description quotes values between 10 and 50 ohms.

The downside is always having this extra «burden» and permanently needing to have another battery as fully charged as possible. Don’t expect earth-shattering advances in sound quality. But, let’s be honest, if you’re always on the move, you might not need the most high-fidelity playback as background noise for your huffing and puffing.

When you’re in the gym and spending more time pumping iron, tapping your feet or sitting rather than scampering around, you’ll definitely need a more powerful battery or rechargeable battery-operated headphone amplifier. You’ll obviously still want it to be small enough to slip into your sports bag or sneak under the sweaty towel you’re dragging from one exercise device to the next. This is another scenario where music serves purely as motivation. As with jogging headphones, the most important thing is creating a more gentle massage for the eardrums.

If, however, you’re someone who spends a lot of time on the tram or train, you may be able to to stow a slightly more bulky headphone amplifier in your briefcase or school bag. In this instance, it’s definitely worth opting for strong, high-quality amps, as you want any background noise to be drowned out completely distortion-free.

Maybe you’ve already snagged a pair of noise cancelling headphones. They’re handy things that block out the hubbub going on around you. And you’re free to turn up the quality even when you’re using headphone amplifiers.

Let me give you an example. The iDSD from iFi Audio features a high-quality D/A converter that also converts DSD signals. In addition, it comes with a 3.5 and 6.3 mm jack connector.

micro iDSD Black Label (USB-DAC)
CHF 679.–
iFi Audio micro iDSD Black Label (USB-DAC)

Availability

  • approx. 3–4 weeks
    Currently 3 piece(s) in stock at the supplier

If ordered immediately.
Information subject to change.

View details

Headphones for the computer

If you usually listen to music via tablet, notebook or mostly on the computer with headphones (whether from your hard drive or streaming service), you can upgrade the sound in two places in one fell swoop.

The sound in digital devices is saved and processed digitally, but humans can still only hear analogue. That’s why these devices need a digital analogue converter or DAC for short. In computers, these can be found on the audio card – and unfortunately, in most cases they’re pretty meagre.

Conveniently, many headphone amplifiers come with a DAC. If you budget about 200 Swiss francs, you’ll get better quality from your converter than you would normally from a computer. It all starts with the fact it has its own energy supply for the electronics. In a computer, on the other hand, the poor little chip has to share the juice with dozens of other parts. In other words, if you want the best possible sound from your computer, check out DAC/headphone amplifier combinations. There are plenty of them on the market.

An example of a tried and tested headphone amplifier-DAC at the higher end of the quality scale that’s still good value for money is the Oehlbach XXL DAC Ultra.

XXL DAC Ultra, Silber (USB-DAC)
CHF 335.–
Oehlbach XXL DAC Ultra, Silber (USB-DAC)
4

Availability

  • approx. 7 – 9 days
    Currently > 5 piece(s) in stock at the supplier

If ordered immediately.
Information subject to change.

View details

But you should always check beforehand that both sides have the right ports. If you stream in high resolution, you’ll also want to check whether the DAC can process the relevant high data rates. Having said that, most external converters can even cope with rates with a 24 bit word size and 192 kHz sampling frequency thanks to standard ICs that have been properly equipped for quite some time now. For non-techies out there, that means you’re getting about a thousand times as much data per second as with a CD.

Headphones and different systems

Are you still stuck on old fashioned CDs or even LPs? Perhaps you prefer to play high resolution files on a high-end HiFi. If that’s the case you probably use the headphone outlet on the central amplifier or CD player. But in the affordable segment, headphone outlets are considered the developer’s lowly invention, even when it comes to good (complete) amplifiers. Their controllers are more than happy to cut these outlets from the device. That’s why a run-of-the-mill operational amplifier often has to do the work behind the jack socket.

Once you have a really good set of headphones, you’ll obviously want the best power supply for it. We’ll leave out the the exception of electrostatic headphones that are popular at the high end of the scale, as they’ve been built with their own power supply. In terms of standard electrodynamic headphones, the HiFi market offers solutions starting at 150 Swiss francs all the way up to – wait for it – 10,000 Swiss francs.

What they all have in common is they can also easily deliver enough juice to high-impedance headphones (from 200 to 600 ohms and above). Many models even offer two jacks so you can listen along with someone else and both use your own headphones. Lehmann Audio’s Black Cube Linear is just one example of this.

Linear USB (Schwarz) (USB-DAC)
CHF 997.–
Lehmann Audio Linear USB (Schwarz) (USB-DAC)

Availability

Mail delivery

  • Unconfirmed delivery time of approx. 7 – 9 days

Collection

  • All locations: Unconfirmed delivery time of approx. 8 – 10 days

If ordered immediately.
Information subject to change.

View details

You can even get headphone amplifiers with individual volume controls for the second set of earphones. Here’s how it works in terms of jacks: to loop a separate headphone amplifier into a HiFi system properly, you need a fixed output at the (pre-)amplifier. That’s normally the tape out – in the past this would have meant connecting up the cassette recorder or tape machine.

It’s here you’ll find a fixed level that’s independent of the amplifier’s volume control and that in turn provides the input for the headphone amplifier. Incidentally, the cable length can be up to three metres without there being any problems. If you’re OK with the cabling, you can place the headphone amplifiers right next to where you want to listen. While there are wireless solutions, I’m yet to hear of any satisfactory options at the top end of the market.

You can then control the monitoring volume on the headphone amplifier. Some models still offer gems such as tone control, which can be really useful depending on your music taste and sound preferences. These days, a lot of high-end headphones are more «mild» and adapted for really low frequencies. If you prefer a peppering of high notes and a leaner bass, you can go ahead and adjust it.

Top of the range

Special circuit tricks such as Crossfeed are a real treat. The problem with headphones in general is that the division of left and right is particularly pronounced. When you’re using speakers and, of course, in real life, you hear sound from the left in your right ear with minimal time delay and vice versa.

Many consumers complain that when they use headphones they don’t get the feeling of having a stage in front of them. They feel like mixed signals in the middle are playing in the centre of their head. In pop music this is usually the vocal. Crossfeed delivers signals to the left and right channel and vice versa with minimal delay and dampened where necessary.

Depending on how well the circuit is designed, it can sound astonishingly good and spacious. The manufacturer McIntosh installed the effect in its first generation, even in its full amplifiers. But sure enough, these premium amps from the US cost an arm and a leg.

The McIntosh MHA150 combines a digital-analogue converter for the highest resolutions with a superb headphone amplifier. Even the price tag is high-end at around 7,000 Swiss francs.

But even «pure» headphone amplifiers can get really expensive. Whether a headphone amplifier uses transistors or tubes is not a quality criterion. Nevertheless, tubes can give a more pleasant headphone sound with their «indulgent» distortion characteristics in a higher price range.

When it comes to sheer performance yield, tubes are mostly inferior to semiconductors. However, headphones need much less voltage and current than loudspeakers. That being said, the circuit should tame the hissing of the receiver, which is particularly annoying over headphones.

It’s possible but it will cost you. A cheap Chinese tube doesn’t guarantee good sound. So beware of the supposedly cheap pseudo premium options. At the other end of the spectrum you’ve got the German high-quality manufacturer Octave. They build the V 16, which is considered one of the best headphone amplifiers in the world. In fact, it’s so good that it became a mainstream full amplifier while it was being developed, despite its low power. This bit of kit will set you back 10,000 Swiss francs – and it can’t even claim top spot for the best in the world.

Gehört zu den besten Kopfhörer- und Vollverstärkern der Welt: Octave V 16.

In top-of-the-range models, you have other connector options. I started out by describing the 3.5 and 6.3 mm connector or jack as standard. You’ll see a trisection on the connector shaft: one segment directs the + signal for the left; the second for the right and the third is for the total – mass, which also serves as a shield.

To ensure there is something for various needs, there are other alternatives for high-end headphones. There are some with two separate cables with headphone jacks; others with so-called XLR connectors or those with a cable that features a quadripole XLR connector. Symmetrical connection drives normal + down one wire and inverted, 180 degrees rotated signal down the other. When the signal comes together again at the headphone membrane, any interference cancels itself out.

Confusing? Yeah, I know. In plain terms it just means the signal remains flawless from start to finish.

Verdict

What’s more important and less expensive is simply knowing you can do your ears the world of good for relatively little money. For one thing, you can grab yourself some decent headphones. You can also combine them with a headphone amplifier – I promise your ears will thank you. Every centime you invest in this sensitive organ of perception will pay off for life.

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User
Ich tummle mich seit über 30 Jahren als Journalist in der Audio-Branche. Dort bin ich berüchtigt als begeisterter Musikliebhaber, hoffnungsloser Analog-Fan und sehr kritischer Lautsprecher-Beurteiler. Was wohl mit kläglichen Versuchen zusammenhängt, Geige und Schlagzeug besser als nur amateurhaft zu spielen. Eine Zeitlang lebte und arbeitete ich der Schweiz, meinem erklärten Lieblingsland. Dorthin kehre ich immer wieder gerne zurück.

17 comments

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User drive_five

Eher die 6- statt 1000-fache Datenmenge. Mit höherer Dynamik und der Möglichkeit, 96 kHz Töne darzustellen. Wenn diese im Quellmaterial überhaupt vorhanden sind. Und das ist so gut wie nie der Fall. Die meisten High-Res Musikdateien sind schlichtweg zu 75% leer. Wenige Ausnahmen bestätigen die Regel.

15.05.2018
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User Anonymous

Tolle Mischung aus Marketing und umstrittenem Hifi-Pseudowissen eingebettet in einen seriösen und gut geschriebenen Text über Kopfhörerverstärker und DAC's.
z.B.:
- XLR hat für so kurze Verbindungen keinerlei Vorteile gegenüber Single-ended-Kabeln.
- Vorteile von HighRes Files gegenüber Reebok-CD sind nicht im hörbaren Bereich ...

15.05.2018
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User Anonymous

Stimmt, aber es gilt zu beachten dass ein Audio System das komplett balanced (also mit XLR) aufgebaut ist klanglich besser ist als ein System das einen gemeinsamen Rückleiter verwendet.

15.05.2018
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User tagomago

Falls ihr löten und schrauben könnt, kann ich den Bottlehead Crack empfehlen. Muss man aber aus USA bestellen. Einfach googeln.

14.05.2018
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User Captcha

Ja davon habe ich auch schon gehört, da ich für meine Sennheiser HD 650 einen AMP gesucht habe. Und der Bottlehead sei eine super Kombi.

15.05.2018
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User Anonymous

Interessanter Artikel. Gibt es KHV mit Crossfeed auch in irdischen Preisregionen?

15.05.2018
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User Anonymous

Das erste in diesem Marketingartikel angepriesene Produkt, der iFi Audio micro iDSD, hat auch eine Art Crossfeed, schon lustig, dass es beim McIntosh als Feature erwähnt wird und dort nicht ...

15.05.2018
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User hegamer

Du brauchst keine Hardware für Crossfeed. Benutz einfach eine Abspielsoftware welche Crossfeed unterstützt.

15.05.2018
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User Anonymous

Der günstigste KHV mit Crossfeed war der FiiO Mont Blanc E12 (NP CHF 140.00; das Nachfolgemodell hat leider keinen Crossfeed); ich betreibe diesen mit einem Audio-Technica ATH-MSR7 was eine wirklich feine Kombi darstellt. Mit Glück findet man den gebraucht ...

Mein absoluter Favorit auch noch mit DSP (besonders zur Modellierung des Basses) und perfektem DAC ist der RME Audio ADI-2 DAC

RME Audio ADI-2 DAC

16.05.2018
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User Anonymous

guck meier audio an, hätte sonst noch einen usb dac/amp (corda aria) günstig abzugeben. alternativ würde ich dir mal woo-audio anschauen, die haben wirklich gute verstärker (z.t. mit dac combos)

19.06.2018
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User Anonymous

Schade gibt es bei Digitec keine Produkte von Schiit, kann die nur empfehlen.

15.05.2018
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User Anonymous

Meines Wissens vertreibt Schiit nur direkt, sprich schlechte Chancen darauf, die Produkte bei Digitec zu finden

15.05.2018
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User swatlord13

Ich suche das Gegenteil.
Kopfhörer, sei es In-Ear oder Over-Ear sind mir oft zu laut bzw. ich kann die Lautstärke nicht fein genug einstellen.
Bei meinem MP3 Player bin ich z.B. bei 5-9 von 30 und bei meinem Windows Laptop unter 20%. Wie nennt man so ein Gerät? Filter? :-)

16.05.2018
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User tookitogo

Also, auf deutsch "Lautstärkeregler". Digitec hat nix passendes im Sortiment, aber auf eBay findest du sie ab ca. $1.50 (inkl. Versand) unter dem Stichwort "inline volume control". Wird zu dem Preis nicht sehr strapazierfähig sein, aber zu dem Preis kann man sich ja einfach eindecken und wegwerfen wenn's kaputtgeht.

21.05.2018
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User manatee

Hi mein Name ist Pedro,
Ich habe folgendes Problem:
Vor einiger Zeit habe ich mir einen Kpfhörer der Marke Parrott Zik 3 gekauft.Das Teil klingt sehr gut,ich konnte aber bis heute keine Kabeloseverbindung herstellen obwohl ich ein Bluetooth von Asus installiert habe.WER kann mir helfen?

19.05.2018
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User tookitogo

Es sei mal erwähnt, dass jede Aufnahme durch viele solche ""Spar-Operationsverstärker zu 30 Rp." geflossen ist, ehe es aufgenommen wurde, denn zu dem Preis erhält man schon recht hochwertige Operationsverstärker ("Op-Amps"), besonders wenn man die Mengenrabatte bedenkt, die Elektronikhersteller bekommen.

Kurz: es gibt Gründe für KHV, aber dies gehört nicht dazu.

21.05.2018
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