Recording - October 2017 - 56

Ehrlund
EHR-M

When we say we're reviewing
a new angle on mic capsule
design, we mean it!
REVIEW BY PAUL VNUK JR.

O

nce upon a time, in the village of Siljansnäs, in the
Dalarna province of Sweden, lived a man named
Göran Ehrlund who had a rather unusual idea for
a mic. Together with Sven Åke Eriksson, he launched the
Ehrlund Microphone company in 2005.
The first Ehrlund product was a contact mic/pickup system
with a triangular membrane now known as The Ehrlund Acoustic
Pickup (EAP). This product came about when Göran
discovered that a triangular membrane was more
transparent and accurate than a circular one. In
2007 he applied this idea to the traditional condenser
microphone, and with the help of Sven's electronics
expertise, the EHR microphone series was born.
As an aside, it's interesting that the two other
major Swedish microphone companies, Pearl
and Milab, both make mics with unusually
shaped capsules.

The EHR-M

Currently there are five models in the EHR line
in various enclosures, all built around the same
triangular-membrane capsule: the instrument
focused EHR-E, the drum focused EHR-D, and
the compact EHR-M1 (the Mini-M). The one noncardioid Ehrlund is the EHR-T, with the ability to
split its dual capsule (front and back) into two
separate outputs so the polar pattern can be adjusted
in the mix-another idea born in Sweden!
The EHR-M, on review today, is arguably Ehrlund's
flagship. It's futuristic, minimalist and classy in its design.
The lightweight aluminum body measures 2.36" in
diameter and 6.10" in height-at only 13.4 oz. in
weight, this is one of the lightest high-end largediaphragm condenser mics I have used.
The body takes up half of the mic, including the removable
aluminum mounting ring. The top half of the mic is the capsule
housing, surrounded by an open, single layer nickel-plated
steel mesh.
56

RECORDING October 2017

The EHR-M comes with a foam-lined wooden slide-top box with
a snug red velvet protection sock/bag. Beyond the aluminum
mount, Ehrlund does not currently offer shock mounts for it, but
I had no trouble using the mic with a third-party Rycote mount.

Why a triangle?

Behind the mesh is the patented triangular capsule assembly,
which at a distance looks circular. That's because the capsule
starts with a circular aluminum dual membrane, but the stainless
steel capsule ring is cut to expose only a perfectly tensioned
triangular surface area.
The "point" of a triangular capsule is all about speed, accuracy
and a highly linear frequency response. On the Ehrlund web
page, this concept is illustrated brilliantly in two videos. First they
strike a circular metal bell; its ringing has a long decay. Then
they strike a triangular bell of the same size and material, resulting
in a super-fast ping. This illustrates the shorter time it takes for a
rectangular capsule to stop resonating vs. a circular one.
The second video demonstrates why a fast-decaying triangle is
better than the slow decay of a circle by dripping water drops into
standing water in a bucket. Just like ripples on a pond, the waves
from the drop not only radiate out from the center to the edges,
they also fold back in. They are never fully dissipated before
another drop falls, resulting in constant motion, which in a mic
could result in constant resonance that could smear the sound. This
is also a great example of why smaller-diaphragm mics typically
have better transient response than large ones.
When water is dripped into a triangular
pan of water, the ripples dissipate almost
instantly before another drop falls, barely
having time to fold back in on themselves.
Sonically this means that the triangular Ehrlund mic is always only reacting to fresh
sound waves hitting it, and not getting muddied
up with previous resonant information.
Sven's circuit design is also all about extreme linearity. The EHR-M sports a noise level
lower than 7 dBA, a maximum SPL of 105 dB,
and a frighteningly broad frequency range of
7 Hz to 87 kHz... and no, that's not a typo.
Frequencywise the mic is fairly flat
and even subdued from the low
end up through about 2 kHz,
where the mic then has a 4-5
dB rise from about 5 to 18 kHz.

Sounds like

As advertised, the EHR-M is
one of the clearest and most natural
large-diaphragm mics I have ever
used. Yes, it does have a very open,
clear top end, but it is a wide top end
presence vs. a peaky and forceful one. In fact,
nothing about this mic is forceful in any way.
I initially worried about this mic being bright,
especially based on its specs, but rather than bright,
it's just really, really, really open. More impressive



Table of Contents for the Digital Edition of Recording - October 2017

Contents
Recording - October 2017 - Intro
Recording - October 2017 - Cover1
Recording - October 2017 - Cover2
Recording - October 2017 - 1
Recording - October 2017 - 2
Recording - October 2017 - 3
Recording - October 2017 - 4
Recording - October 2017 - 5
Recording - October 2017 - Contents
Recording - October 2017 - 7
Recording - October 2017 - 8
Recording - October 2017 - 9
Recording - October 2017 - 10
Recording - October 2017 - 11
Recording - October 2017 - 12
Recording - October 2017 - 13
Recording - October 2017 - 14
Recording - October 2017 - 15
Recording - October 2017 - 16
Recording - October 2017 - 17
Recording - October 2017 - 18
Recording - October 2017 - 19
Recording - October 2017 - 20
Recording - October 2017 - 21
Recording - October 2017 - 22
Recording - October 2017 - 23
Recording - October 2017 - 24
Recording - October 2017 - 25
Recording - October 2017 - 26
Recording - October 2017 - 27
Recording - October 2017 - 28
Recording - October 2017 - 29
Recording - October 2017 - 30
Recording - October 2017 - 31
Recording - October 2017 - 32
Recording - October 2017 - 33
Recording - October 2017 - 34
Recording - October 2017 - 35
Recording - October 2017 - 36
Recording - October 2017 - 37
Recording - October 2017 - 38
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Recording - October 2017 - 41
Recording - October 2017 - 42
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Recording - October 2017 - Cover3
Recording - October 2017 - Cover4
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