A couple of months ago I was impressed by the entry-level headphones from US firm Blue Microphones,
the Blue Lola. Continuing the name theme, but at the top of its range, are the
Blue Ella headphones.
What are they?
Since the “low end” Blue Lola headphones (our review here) cost nearly $500, you won’t be surprised to read that the Blue Ella headphones are straying into high-end prices. Indeed, they sell in Australia for $1,299. In some ways, they are very similar to the Blue Lola models. In others, very different indeed.
How are they similar? They look quite similar with large, bulky earpieces that fully encompassed my ears without squashing them into unfortunate shapes. They have the same “Formula One race car inspired” mechanical arrangement for adjusting the height of the earpieces. I’m neither here nor there about that. It’s one of many effective solutions. But I would note that my wife does not approve of the styling.
Where they differ is primarily in the working parts. First,
rather than dynamic drivers, they use planar magnetic drivers. Dynamic drivers
are like regular loudspeakers. They use a cone, or something similar, with a
cylindrical cylinder at the back. Around the cylinder is a coil, and
surrounding the cylinder is a magnet. As the musical signal goes through the
coil, it creates a magnetic field which works against the magnets, moving the
coil. That, in turn, moves the cone backwards and forwards.
Planer magnetic headphones use a thin membrane with a
conductor attached to its surface. The magnets are on both sides of the
membrane. The conductor covers pretty much the whole membrane, so it moves
The drivers of the Blue Elle headphones are 50mm by 500 and
are only 50 microns thick. That’s 0.05 millimetres
or around half the thickness of a piece of standard 80gsm paper. Thin membranes
are light in weight, which means excellent responsiveness.
The planar magnetic drivers are
mounted in large sealed enclosures. Blue says that the Ella headphones
are “handmade in small quantities by expert craftsmen”.
Another way in which they differ from the Blue Lola
headphones is that they have an internal amplifier. Blue rates this at 250 milliwatts of output.
The amplifier is in turn powered by a 1,000mAh battery,
which you charge via a Micro-B USB socket on the left earcup, next to the audio
connection. It takes several hours to charge. I seemed to get something around
the claimed 12 hours of playback time. Should the battery run flat you can
still use the headphones in passive mode.
There is no volume control on the headphones. You use the volume control on the source device. There’s a three-position switch around the input socket. One position is “off”, one is “on”, and the third is “on” with bass boost. The regular “on” position doesn’t seem to apply any EQ to the sound.
The headphones detect how widely they are stretched. When
resting with the earcups together, they switch off. The come on again when you
open them up to put on your head. Power status can be seen from the gentle glow
at the back of each earcup. This cannot be switched off.
Cables and controls
The audio input is analogue only and uses a 3.5mm stereo
socket. But you won’t be able to use most third-party cables because the actual
connection is sunk quite a long way into the body. The plug on the supplied
cable has a very thin shaft which allows it to reach.
There are two cables provided, both with wound-cloth insulation.
One is 1.2 metres long, and is fitted with iOS-compatible remote controls:
volume up and down and play/pause. The other is 3 metres long and not so
adorned. Also included is a 3.5mm to 6.5mm plug adaptor.
Now, you might be thinking: headphones, built-in amplifier, so Bluetooth, right?
Wrong. These are purely analogue headphones. The amplifier is
there to power the drivers as part of the total audio design package. It isn’t
there so that they can work wirelessly.
The headphones are large and bulky. They weigh 482 grams
according to my scales. Included is a soft carry case made of some very
Let’s get technical for a moment. One of the very useful
things about having an amplifier built into the Blue Ella headphones has to do
with impedance. Impedance is related to the resistance any material offers to
the passage of electricity. Only superconductors allow electricity to pass
through perfectly. Everything else, even the finest gold and silver, impedes or
resists its passage. We measure impedance – to simplify things a little – in
Headphones normally impede the electrical signal by somewhere between 16 and 300 ohms. A lower impedance generally lets the playing device – your phone, for example – deliver more power to the headphones. But a lower impedance also means that more power is wasted in the wiring and in any internal impedance within the source device. Indeed, any weaknesses in the wiring become more obvious with a low impedance connection.
The cool thing is that an amplifier typically has a much
higher input impedance than headphones. In effect, it isolates the headphones
from some of the problems that might be downstream. All that is in addition to
making it independent of the power output of the source device.
That’s the theory. But I notice that Blue specifies the
input impedance of these headphones as 50 ohms in passive mode (that is, when
they’re switched off). And at a mere 10 ohms in active mode (when they’re
switched on). That’s the complete reverse of what I would have expected.
So I pulled out my multimeter and measured the resistance
with the Blue Ella headphones switched on and off. With them off, they measured
around the 50 ohms claimed by Blue. With them switched on, my multimeter
indicated a resistance beyond its scale. That would mean several million ohms.
AC vs DC
Ah, but a multimeter only measures DC resistance. All music
is alternating current. Might that not be different?
So I took a trip to Jaycar Electronics and purchased some 47
ohms resistors, a 3.5mm stereo plug and a 3.5mm stereo socket. I made a
measurement rig, plugged the headphones into a headphone amplifier, with the 47
ohms in series. Then I created a 1,000-hertz
sine wave in my computer and fed it to the rig. A little bit of arithmetic
later I had a result of 50.6 ohms for the headphones with them switched off,
and 4200 ohms with them switched on.
That latter figure is a little lower than I would have
expected, but it does mean that the cable and internal impedance of your music
player or phone will have virtually no effect on performance.
The only puzzle remaining is why Blue would put such an
unflattering figure on its website.
Listening to the Blue Ella headphones
Blue doesn’t specify a sensitivity for the headphones.
That’s the figure that gives you an idea how loud they’re going to go. There would
be two such figures for these headphones: powered on or not. So will they go
Well, powered off, it
will depend on your source device. I played a little of Beethoven’s First
Symphony (an original instruments version) on my Google 2 XL phone using the
included mini USB Type-C to analogue DAC. At maximum output the listening level
was comfortable, but that was it. Switching to something a little louder – Rage
Against the Machine’s debut album – the level was a little too low to be fully
But when I switched on the headphones so as to get the benefits of the internal
amplifier, there was plenty of level
available for both music types.
I’d note at this point is that the headphones seemed to sound, for any given decibel level, a little quieter than many. That’s because they seem to produce just about no audible distortion at all, even running loud. Noticeable levels of harmonic distortion make music seem louder. And, no, you don’t want this kind of artificial loudness. It’s wearing over time.
But even without being switched on, the headphones were
powerfully loud when fed by a high-resolution
audio player, or by my Oppo portable DAC/headphone amplifier. With power on,
the Blue Ella headphones are powerfully loud pretty much regardless of source.
Comparing them with some other headphones with known specifications, I’d estimate
the passive sensitivity at around 96dB for 1mW of input. Since the internal
amplifier has 250 milliwatts available, you’re looking at maximum levels pushing
120dB using the built-in amp.
Okay, that takes care of practical matters. How do these
headphones sound? Are they better than the Blue Lola headphones, for example?
Why, yes they are. Noticeably. Clearly. Markedly.
It has been a while since I’ve listened to headphones which
excited me as much as these ones. A long,
long while. Because all I can say is positives.
I’ve probably heard headphones able to provide as much
detail, but they’ve had other defects (for example, too much treble). I’ve
heard other headphones with more, and perhaps more extended, bass. But often
that was because the bass level was too high, and there were costs elsewhere.
Such as loss of detail.
Instead, what the Blue Ella headphones delivered was an exciting completeness in the music along
with a true high fidelity (that is,
highly accurate) balance in the sound. The bass was solid and full and exact.
The treble was detailed, and present regardless of what was going on.
And I just kept noticing things in the music that I hadn’t
It didn’t matter what genre I was using. “Killing in the
Name” by the aforementioned Rage opens
with a powerful bass riff, over which is played cymbals
of surprising delicacy, and cowbells which rang through the mix intact. But the
Beethoven was sweet and textured.
Some 1980s Eurythmic had me kind
of dancing in my seat. The original Broadway recording of Fiddler on the Roof took on new life. Glenn
Gould’s Steinway in his 1981 re-doing of Bach’s The Goldberg Variations was beautiful, bell-like, and marred as
always by Gould’s irritating humming.
The overall sense, though, was liveliness. Of life. The
music came to life in a way realised by few other headphones.
The Blue Ella headphones are for people who are really serious about high-quality sound. And for those who want their headphones to convey the true excitement of their music. You’ll be paying for that privilege, though. I think it’s a price that’s worth it. The Blue Ella website is here.
Value for money
Ease of use
Superb, lively sound
Amp makes them relatively independent of source wiring
Cope well with low output sources
Still sound very good when switched off