Bronze (Br) Collectors Series

The Bronze (Br) Collectors Series is offered to the most discerning audiophiles who desire the ultimate in sonic performance in tandem with a supreme finish. This series has the same specifications as the gold plated Bronze (Br) version except for the added external patina finish. Adding a patina to bronze helps to accelerate by thousands of years its corrosion so as to form a protective layer with the added benefit of adding a true captivating finish for all to see.

In the Collectors Series, each cartridge shell patina is an artwork, so every piece is unique. For the works, we have opted for six (6) distinct patina finishes. Among those, each individual shell part is manually done one by one by the artisan. At the end of the process, the artwork is finally protected with a trusted Museum micro-crystalline wax polish. The patinas age over the first years and get even better with time. Before handing our pieces to the artisan for the final touch, we carefully hand polish each shell part to a mirror finish so this later helps the patina have a deeper and more detailed visual impact. Last but not least, we devote a lot of time and energy in creations that represent our labor of love. Then, for the completion of the artworks, we needed to share together a synergy with the right artisan so he faithfully communicates the meaning of our dear product. The artworks were handed to a reputable smelter (Art foundry) here in Quebec.

Audio Musikraft Nitro2 Patinated Copper Nitrate Bronze Phono Cartridge
Bronze (Br) - Copper Nitrate Patina

Standard tonewood inserts may differ from the actual picture (shown: Beeswaxed cocobolo)

Each patina is an artwork, so each piece is unique and will slightly differ from this picture

Audio Musikraft Nitro2 Patinated Silver Nitrate Bronze Phono Cartridge
Bronze (Br) - Silver Nitrate Patina

Standard tonewood inserts may differ from the actual picture (shown: Beeswaxed cocobolo)

Each patina is an artwork, so each piece is unique and will slightly differ from this picture

Audio Musikraft Nitro2 Patinated Black Acid Bronze Phono Cartridge
Bronze (Br) - Black Acid Patina

Standard tonewood inserts may differ from the actual picture (shown: Beeswaxed cocobolo)

Each patina is an artwork, so each piece is unique and will slightly differ from this picture

Audio Musikraft Nitro2 Patinated Copper and Iron Nitrate on Bronze Phono Cartridge
Bronze (Br) - Copper and Iron Nitrate Patina

Standard tonewood inserts may differ from the actual picture (shown: Beeswaxed cocobolo)

Each patina is an artwork, so each piece is unique and will slightly differ from this picture

Audio Musikraft Nitro2 Patinated Silver Nitrate on Black Bronze Phono Cartridge
Bronze (Br) - Silver Nitrate on Black Patina

Standard tonewood inserts may differ from the actual picture (shown: Beeswaxed cocobolo)

Each patina is an artwork, so each piece is unique and will slightly differ from this picture

Audio Musikraft Nitro2 Patinated Iron Nitrate Bronze Phono Cartridge
Bronze (Br) - Iron Nitrate Patina

Standard tonewood inserts may differ from the actual picture (shown: Beeswaxed cocobolo)

Each patina is an artwork, so each piece is unique and will slightly differ from this picture

Bronze's sonic signature...

To best compliment the way the Audio MusiKraft Nitro motors are designed, our latest research showed that the ideal metal shell environment to work with was a bronze alloy.

As usual, our primary objective was to provide optimal musical playback. In general, we believe bronze is quite favorable for high-performing audio component construction when introduced in strategic places. Here are two key reasons why we have chosen this mythic alloy in search of specific sonics. One, for its heavier mass, to better control the arm resonances as well as stimulate the cartridge’s moving coil suspension, and secondly, by providing to the motor the best acoustically sound structure in reference to the proper alloy composition; i.e. copper, lead and tin which are low resonant materials. These supple materials dampen the ringing transmitted back to the generator usually associated with metals and which would translate into distortion. It turns out that bronze is regarded as a durable and ageless material which last millenniums which therefore represents in some way our strong and unique recyclable feature. There could not be a better match as this material is commonly used for commemorations so we spared no expense with its look.

In every aspect, our quest for ultimate performance has proven us right.

Requirements

The use of a Nitro cartridge requires at least three things:

  1. Medium to high mass tonearm to match these low compliance cartridges (i.e. 10g. and more).
  2. System ready for low output MC cartridges or either using a head amp or a step-up transformer (SUT).
  3. The Bronze (Br) Nitro cartridges require a tonearm able to counterbalance 21g.

Which Nitro Motor to Choose…

Audio MusiKraft offers two distinct cartridge motors: Nitro 1 and Nitro 2.

Mechanically, both motors closely resemble each other. To help distinguish them the external finish on the Nitro 2 is gold plated. The main difference stems from the Nitro 2 possessing a higher degree of copper wire purity resulting in a more faithful reproduction. Electrically; the Nitro 2  has a lower DC resistance so the recommended load is slightly different from each other and the Nitro 2  is slightly lower in output voltage than the Nitro 1.

Essentially the Nitro 1 is pleasing to listen to, it provides vivid sound which translates to a more «forefront» presentation. It offers more midrange bloom and it confers more presence than the Nitro 2.

The listener looking for a more neutral and precise reproduction will prefer the Nitro 2 version. Subjectively, this one has a flatter frequency response in its entire passband. It has slightly better and refined timbre than the Nitro 1, especially notable in the mid-range portion; thanks to the use of 6N pure copper wire. Its lower moving coil equipment mass ensures quicker transients.

The Cartridge Kit Includes

  1. Either one of the two (2) distinct motors: Nitro 1 or Nitro 2;
  2. Offered in six (6) patinated artwork finish;
  3. Three (3) pre-selected tonewoods. We have chosen clear lacquered maple, beeswax patinated torrefied pine, and eco-oiled ipe as the optimal woods for you to cover a large musical and sonic spectrum.
  4. One damping oil vial, a complete tool kit and various screws for a trouble-free installation.
  5. A red stained baltic plywood jewel box.
Audio MusiKraft three various phono cartridge wood inserts

Actual tonewoods included: Clear lacquered maple, beeswax patinated torrefied pine, and eco-oiled ipé.

Wood color and grain may differ from the actual picture.

Reviews

Awards

Granted: Class “A” / $$$

Technical Specifications

Series

Bronze (Br) Collectors

Motor model:

Nitro 1

Nitro 2

Shell Specifications

Alloy material:

bronze

Protective layer:

micro-crystaline wax

Finish:

authentic patinas

Color:

6 choices

Shell weight (nude):

13.1g

Headshell mount:

per EIA Standards, 1/2″

Shell cover threads:

10 – M2.5 x 0.45 (5 overhang positions)

Cover depth clearance:

2.2mm (max. screw length)

Tone wood inserts (3 species incl.):

Clear lacquered maple, beeswax patinated torrefied pine, and eco-oiled ipé

Cartridge Specifications

Generating system:

LOMC (low output moving coil)

Channel:

2, stereo

Cartridge size (LxWxH):

28.5 x 18.0 x 17.7mm

Cartridge weight (with wood inserts):

20.6g – 21.1g

Coil conductor:

copper

6N pure copper

Diamond

Stylus shape:

conical

Tracking tip size:

0.65 mil

Cantilever:

light alloy

Measurements

Playback frequency response:

20-45,000 Hz

Channel separation (1 kHz):

> 25 dB

Channel sensitivity difference (1 kHz):

< 1 dB

Output voltage (1 kHz, 50mm/sec.):

0.35 mV

0.30 mV

Stylus pressure (vertical tracking force):

2.5 ±0.3 g

Compliance (on disc):

5 x 10-6 cm/dyne

Electrical impedance (1 kHz):

40Ω ± 20 %

14Ω ± 20 %

Recommended load resistance:

100Ω min. (40 Ω min. SUT)

100Ω min. (14Ω min. SUT)

Warranty: One (1) year against manufacturer defect in materials and craftsmanship. The warranty does not cover any damage by the owner. For eligibility, the cartridge must return to the manufacturer for inspection and approval. Please handle your cartridge carefully. Refer to Terms and Conditions for additional pieces of information.

Refer to our complete download section. Among this page, you will find all our files such as manuals, technical datasheets, wood insert charts, voicing procedures, White Papers, etc.

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