Wunder Audio CM7-GS-M7 Suprema

Description

The
CM7 G (Glass Tube Switchable) Suprema is the latest evolution of the CM7-GTS.
This mic is true to a vintage U47 with a modern upgrade, we’ve engineered a
switchable cardioid mode relay on the inside of the mic instead of on the
outside of the grille. This mode produces a smoother more full-bodied sound.
The pattern switch is still on the PSU, but the actual switch point in the
circuit is directly below the capsule compartment. At the same time, it retains
the eight different polar patterns found in a vintage M49, so it is like having
two mics in one!

Grille Our
Wunder Audio CM7 GS Grille is true to vintage with three gauges of grill mesh
at the head grille: an outer large mesh, an inner medium mesh, and a fine mesh
that is sandwiched in between.

The
Wunder Audio Suprema Grille has acoustic interplay with the capsule, having the
electronic properties of a faraday cage.This proper vintage mesh gauge is not
the readily available metric gauge and is vastly important for the legendary
sound of a U47.

Capsule The
Wunder Audio CM7 GS Suprema Microphone can be ordered either with K47 or M7
Capsule.

Our
diaphragm is stretched and glued to the rim, akin to how a snare drum head is
stretched over a rim and never screwed to the backplate.

Our
backplate is brass and precision milled by hand in Switzerland to the original
rim height 15/10000th inch specification within one-micron tolerance. (1 Micron
= 0.0000393701 inch) A modern upgrade to the original M7’s which had up to
0002” tolerance and explains why some brand new U47’s back in the 1950’s
sounded better than others.

The
CM7 GS has three mounting isolation rims, true to the vintage Berlin M7 and a
modern upgrade to the Gefell M7 which has only two; having three rims provides
an improved isolation of the ground. Our capsules then sent to Germany, where
they have perfected the craft of skinning them in gold.

Tube The
CM7 G Suprema includes a new old stock Telefunken 800 series tube. This tube is
modern glass derivative of the VF14M used in the vintage U47. It uses the same
system construction but in a package that is less likely to get microphonic.

Transformer The
transformer inside the CM7 G Suprema is a historic recreation of the early
transformers used in the exceedingly rare early “Large Badge” U47s. It contains
the exact vintage Mu-Metal as these early Berlin U47 transformers and are wound
to the original Braunbuch specifications using NOS (new old stock) laminations.

The
most important difference in the first several hundred “Large Badge” U47’s was
that the transformer bobbin was a full 1/8” larger than the later version of
the U47 transformer. The CM7 G Suprema transformer incorporates these highly
desired larger bobbin specs.

We’ve
replaced the problematic PVC wire insulation of the original U47 in the CM7 GS,
upgrading it to Teflon to ensure 100% reliability Over the decades, the
original U47 transformers will begin to decay. The clear PVC coating that was
used as an insulation between the layers of the Mu-Metal laminations rubs off
by the transformer mounting screws and fuses the lamination layers together
causing changes in the lows and high frequencies.

Additionally
PVC was used as insulation on the hookup wire emanating from the bobbin and
this PVC eventually flakes off the wire causing irrevocable damage to the
bobbin windings.

Aging
and decay of the transformer and 30 other components in a 66-year-old vintage
U47 microphone is the reason for the undesirable sound in many of the older
mics.

Capacitor We’ve
optimized our passive components to achieve a true audiophile performance.
While audiophile equipment is usually referred to at the end of the chain in
recording, we feel that it is most important that the first link in the
recording chain, the microphone, be the best attainable. To be able to listen
to the best possible recording, you must be able to record the source with
minimal amounts of noise and distortion and be able to accurately capture every
nuance of the sound. We’ve enhanced our true to vintage microphones by
utilizing the Suprema Silver Gold Oil capacitor which is the highest quality
capacitor available today. More importantly, sonically the CM7 GS capacitor
stands out due to its wonderful natural singing and exceptional micro dynamic.
Capacitance: 1uF; Dielectric: Polypropylene Metallization 99.99% silver,
1% gold; Purity of silver: min. 99.97% typ. 99.99%; Purity of gold: min. 99.97%
typ. 99.99%”.

Sound:
At this level we are talking about a really serious capacitor, relative to
other exotic types. They are richer and better layered and they seem more open
and more spatial. Mundorf Silver Gold Oil really excels in image depth – call
it bowling alley depth! A slight hint of top-end air, this probably contributes
to the perceived spatiality and micro-detailing. These capacitors are so quiet
and really let you look very deep into the recording!

This
results in a modern-vintage sound where the spectrum opens up, adding emphasis
to the sound staging and creates a greater sense of air and transparency,
without the impression of a diminished mid and lower-end response. The outcome
is a less grainy and a much more fluid sound. The focus is tighter and sharper.

Power
Supply The
new generation tube Microphone PSU is proprietary to Wunder Audio and is an
upgrade from the vintage tube mic PSU’s used for the 1960’s era Neumann design.
Our upgrade gets a clean and stable DC voltage to the mic and shields the
influx of Wi-Fi and RF interference with 100 percent reliability. We’ve
engineered our PSU to the equivalent of the technology incorporated in top tier
audiophile systems, using a duel-pole neutral-fusing design. The PSU can be
plugged into any voltage in the world without having to jumper a voltage
setting switch.

Inside,
we’ve incorporated extremely accurate 30 turn trim pots so we are able to
fine-tune all of the voltages. Most other power supply designs either do not
have a voltage trim or use a single turn pot, which is susceptible to drifting.

For
the most reliable pattern switching, the CM7 GS PSU uses a military spec
Grayhill switch.

Box
and Carrying Case Your
Wunder Audio CM7 GS is nestled in velvet and softly secured in place in a
foam-lined quarter sawn oak box that is clasped and hinged. This box then is
safely incased in a precision velvet-lined thick foam tweed case that also
holds your PSU, your shock mount, and your cables. The tweed carrying case is a
work of art in itself; it uses the same Fender tweed found in a vintage fender
guitar case which amplifies the vintage period of the vintage-style CM7 GS
microphone, and it is trimmed with top grain leather and fine stitching. The
CM7 GS case has a strong leather handle and combination lock to keep your mic
secure. This case can be sold separately.

Upgrade
Your Mic All
previous versions of the Wunder Audio microphones can be upgraded to the
Surprema.

Additional information