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DMM copper disc sitting on the turntable of a Neumann AM32 lacquer cutting lathe, built in the 1930s

Direct metal mastering (DMM) is an analog audio disc mastering technique jointly developed by two German companies, Telefunken-Decca (Teldec) and Georg Neumann GmbH, toward the end of the 20th century after having seen the same technology used by RCA Princeton Labs for its SelectaVision videodiscs in the late 1970s.

Records manufactured with this technology are often marked by a "DMM" logo on the outer record sleeve. Many current production high quality pressings, as well as standard production LPs from the 1990s, only indicate its use by inscribing "DMM" in the lead-out groove area of the disc.

Neumann was responsible for manufacturing the actual DMM cutting equipment as part of its VMS80 series lathes.

Overview

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The advantages of DMM (hard surface material) over acetate lacquer cutting (soft surface material) are both sonic and practical: because of the rigidity of the master disc medium, no groove wall bounce-back effects take place after the cutting has been completed. This preserves the original modulation details in the groove walls much better, especially those involved with sudden fast attacks (transients). The improved transient response, as well as the more linear phase response of DMM improve the overall stability and depth-of-field in the stereo image. In addition, disturbing adjacent groove print-through sounds (groove echoes) are reduced in DMM. Also, there is no need to rush the finalized master disc directly into a refrigerator for groove preservation, as in conventional lacquer disc cutting, before processing the master disc to produce matrices for the pressing of the records. Finally, only one electroplating generation is required to produce stampers, as opposed to three for conventional lacquer masters.

The cutting lathe for DMM engraves the audio signal directly onto a copper-plated master disc, instead of engraving the groove into a lacquer-coated aluminum disc. Examination of early DMM discs revealed what appeared to be a high frequency modulation in the groove, thought to be caused by the use of an ultrasonic carrier tone. In fact, there was no carrier tone and the modulation was simply caused by the vibration (squeal) of the cutter head as it was dragged through the copper disc.

Unlike conventional disc mastering, where the mechanical audio modulation is cut onto a lacquer-coated aluminum disc, DMM cuts straight into metal (copper), utilizing a high frequency carrier system and specialized diamond styli, vibrating at 60 kHz[1] to facilitate the cutting.[citation needed]

The DMM copper master disc can be plated to produce the required number of stampers using the one-step plating process. Rather than having to electroform a master (or "father"), mother and then stampers (the traditional "three-step process"), the DMM copper disc serves as the 'mother". Bypassing the silvering process and two electroforming stages reduces the risk of introducing noise that can be generated in the electroforming (galvanic) process. In cases where hundreds of stampers may be required, the DMM disc is often used as a mandrel to electroform a master and mother, from which many stampers are then made. Chemical passivation of the metal surface of each part precludes "plating," so the parts can be mechanically separated from each other upon removal from the tank.

Since the sale of Neumann to German microphone manufacturer Sennheiser, Neumann no longer produces lathes or supplies parts. Since DMM was introduced at the very end of the vinyl age, only about 30 DMM lathes were ever made, compared to hundreds of lacquer lathes from various manufacturers, and about 10 of them were later converted to be used for conventional lacquer cutting. The lathes in use today are kept operational by independent service consultants, as well as cutting room personnel themselves, often by buying incomplete lathes and stripping them for parts.

The DMM specification also includes a profile for the pressing of 12-inch records. To the naked eye, this profile has no obvious contour on the face of the record giving the appearance of a totally flat-faced record. For the purpose of compression moulding, which is the process by which records are pressed, the face of the record does indeed have a contour and a cross-sectional view of a 12-inch record will reveal that it is wedge shaped from the centre to the edge. The lack of obvious contour in the groove area on the face of the record closely replicates the original disc surface and reduces playback errors. Pressing records with this profile was mandatory for a record to bear the "DMM" logo. DMM licensees that did not use this profile were unable to use the DMM logo on its products, but were of course free to use terms such as "Mastered on Copper" as did EMI Australia when not using the DMM-profiled moulds or when cutting a DMM master for another record manufacturer. The best example of a DMM pressing can usually be found on the Teldec (Germany) or EMI (UK) labels from the early 1980s.

The decline of vinyl records in favour of the compact disc, saw many Neumann VMS82 DMM lathes converted for cutting lacquer discs as few plants were able to process DMM masters and so many disc cutting facilities conformed to the industry standard – cutting on lacquer.

As of 2009 there are seven publicly-usable DMM cutting facilities left in the world, all located in Germany, Netherlands, or Czech Republic.[2] The US lost its last DMM cutting facility in 2005 with the demise of New York City-based record manufacturer Europadisk LLC. Europadisk's DMM lathe was sold at auction to the Church of Scientology for US $72,500.[citation needed]

The DMM concept was a spin-off of RCA's SelectaVision development of CED videodisc recording equipment both in Indianapolis as well as the David Sarnoff Research Facility in Princeton, New Jersey, who traded it to Teldec for other research it used in other capacities. After further development, Teldec attempted to sell its DMM technology back to RCA, however RCA was not interested. Therefore, as a result, all DMM titles from RCA and subsidiary labels were all mastered elsewhere.

Although Neumann produced, demonstrated and promoted a successful prototype CD Mastering unit for DMM, it never went into commercial production. Most of the remaining original spare parts were purchased from Neumann by the UK disc cutting consultant Sean Davies, who carried on repair maintenance of existing systems since Neumann stopped production.[3]

Advantages and disadvantages

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The direct metal mastering technology addresses the lacquer mastering technology's issue of pre-echoes during record play, caused by the cutting stylus unintentionally transferring some of the subsequent groove wall's impulse signal into the previous groove wall. In particular, a quiet passage followed by a loud sound often clearly revealed a faint pre-echo of the loud sound occurring 1.8 seconds ahead of time (the duration of one revolution at 33 rpm). This problem could also appear as post-echo, 1.8 seconds after a peak in volume.

Another improvement is noise reduction. The lacquer mastering method bears a higher risk of adding unwanted random noise to the recording, caused by the enclosure of small dust particles when spraying the silvering on the lacquer master, which is the necessary first step of the electroplating process for reproduction of the master disc. As the DMM master disc is already made of metal (copper), this step is not required, and its faults are avoided.

With the groove being cut straight into a metal foil, DMM therefore reduces the number of plating stages in the manufacturing process.

DMM is not without potential disadvantages as well. DMM LP pressings are sometimes described as having a harshness or forwardness in the high frequencies. The fact the groove is cut to copper, a hard metal, and not to soft lacquer, nitrocellulose, supposedly endows DMM vinyl LP with a very different tonality to traditionally manufactured vinyl LP pressings. Direct metal mastering requires a radically different cutting angle than traditional (lacquer) cutting, almost 0 degrees.[1] However the playback cartridges will always have the standard playback angle of 15–22.5°. Thus, the DMM process includes electronic audio processing [4] so the records can be played with a standard cartridge despite having been cut at a substantially different angle. This electronic processing might account for the supposedly different high frequency "signature sound" of DMM records.

Digital recordings

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A similar technique, developed by Teldec is used for digital records on CDs and DVDs.

See also

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References

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General Reading

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Revisions and contributorsEdit on WikipediaRead on Wikipedia

Direct metal mastering

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from Grokipedia
Direct metal mastering (DMM) is an analog audio mastering technique primarily used in vinyl record production, in which the audio signal is directly engraved into a copper-coated stainless steel disc using a specialized diamond stylus to create V-shaped grooves, eliminating the need for a traditional lacquer-coated master.[1] This method allows for the production of durable metal masters that can be electroformed into multiple stampers in a single step, streamlining the manufacturing process compared to conventional lacquer-based approaches.[2] Developed in the 1980s by the German companies Teldec (Telefunken-Decca) and Georg Neumann GmbH as an advancement over earlier metal mastering technologies like the TeD system, DMM was introduced during the declining years of vinyl as a dominant medium to improve efficiency and sound fidelity.[1][2] The technique gained adoption among major pressing plants, with facilities like GZ Media implementing it as early as 1985 and continuing to operate multiple DMM lathes today.[1] Although originally analog, DMM has been adapted for digital sources, enabling precise transfer of high-resolution audio to vinyl with minimal distortion.[3] Key advantages of DMM include superior high-frequency response, reduced surface noise and pre-echo effects, and the ability to achieve longer playing times through more efficient groove spacing, resulting in cleaner and more detailed playback.[1] The direct cutting into metal also produces masters that yield more robust stampers, capable of pressing thousands of records without degradation, which is particularly beneficial for high-volume runs.[2] However, DMM requires specialized equipment, limiting its availability to a handful of facilities worldwide, primarily in Europe, and it can sometimes result in shallower grooves that may affect low-end dynamics compared to lacquer cuts.[4] Despite these constraints, DMM remains a preferred method for audiophile releases and reissues seeking optimal sonic quality in the vinyl revival era.[1]

Introduction

Definition

Direct metal mastering (DMM) is a technique for producing phonograph record masters by cutting audio grooves directly into a copper-plated stainless steel disc, bypassing the traditional lacquer-coated aluminum base used in conventional mastering processes.[5][6] The core components of this method involve a stabilized copper layer electro-deposited over a stainless steel substrate to form the master disc, which allows for direct groove modulation without intermediate materials.[5][6] The term was coined in the late 1970s by TELDEC (Telefunken-Decca Schallplatten GmbH), in collaboration with Georg Neumann GmbH, to highlight its distinction from earlier lacquer-based approaches.[6][5] Its fundamental purpose is to generate a more durable and precise master for vinyl pressing, reducing surface noise and enabling extended playing durations compared to standard methods.[5][6]

Historical development

Direct metal mastering (DMM) emerged in the late 1970s as an innovative response to the durability limitations of traditional lacquer-based record production, where lacquer discs were prone to instability, spring-back during playback, ticks, pops, and low manufacturing yields from electroforming. Developed by TELDEC (Telefunken-Decca Schallplatten GmbH), a joint venture between Telefunken and Decca Records, in Hamburg, Germany, the technique involved cutting the audio groove directly into a thin copper layer coated on a stainless steel substrate, allowing the master to serve immediately as a durable metal mother for stamping. This approach built on earlier concepts of cutting grooves into metal dating back to a 1891 German patent but was revitalized through TELDEC's research into videodisc technology in the 1970s, including the TeD (Television Electronic Disc) system introduced commercially in 1976. DMM was patented in 1982 (U.S. Patent 4484320).[5][6][2] The invention stemmed from a long-standing partnership between TELDEC and Georg Neumann GmbH, a leading manufacturer of recording equipment, which provided essential components like the SX-80 stereo cutterhead adapted for DMM. Key advancements included the integration of ultrasonic vibrations (60-80 kHz) to overcome the higher cutting resistance and viscous drag of copper, preventing the stylus from sticking during the process—a challenge not present in softer lacquer cutting. Building upon research into metal mastering for videodisc technology in the 1970s, including the TeD system introduced in 1976, the full audio application was refined under TELDEC's direction, with Neumann handling lathe production under license. The first commercial audio implementation arrived in 1981, with TELDEC releasing DMM lathes to the public in 1982, marking the technique's debut for LP records.[5][6][2] Early adoption faced significant hurdles, including the substantial cost of specialized lathes like the Neumann VMS-82 and the need for precise engineering to address issues such as high-frequency "sizzle" or edge noise during playback. These factors restricted initial use to a handful of high-end studios, primarily in Europe, limiting widespread application until technical refinements in the late 1970s. By the early 1980s, major labels such as EMI had begun integrating DMM for high-fidelity jazz releases, with over 40 producers worldwide adopting the technology by the mid-1980s and more than 100 million DMM-pressed records sold globally by 1987. This milestone reflected DMM's commercial emergence, offering improved noise reduction (up to 6 dB) and 10-15% longer playing times compared to lacquer masters.[6][7][2]

Technical aspects

Preparation and equipment

The preparation for direct metal mastering begins with the substrate, a polished, non-magnetic stainless steel disc approximately 0.8 mm thick, which serves as the base for the recording surface. This disc undergoes thorough cleaning to remove any contaminants, followed by electroplating in a galvanic bath to deposit a high-purity, amorphous copper layer typically 100 micrometers thick. The copper coating provides the necessary hardness and conductivity for precise groove cutting with a diamond stylus, while resisting deformation and enabling direct plating afterward.[5][8] Essential equipment includes specialized cutting lathes adapted for metal substrates, such as the Neumann VMS-82 or earlier SX-80 CM models developed in collaboration with Teldec. These lathes feature a stereo cutterhead with diamond stylus designed for DMM, often incorporating ultrasonic vibration at around 60 kHz to minimize cutting resistance and friction on the copper surface. A vacuum system integrated into the lathe removes metal chips and debris immediately behind the stylus during cutting, preventing groove contamination and ensuring clean modulation. Unlike lacquer-based systems, the DMM stylus operates without heating, relying instead on the metal's rigidity for stable engraving.[5][2][9] Audio signal preprocessing for DMM involves standard RIAA equalization to optimize dynamic range and reduce noise, with adjustments for the copper substrate's enhanced rigidity that supports higher groove velocities—up to 5 cm/s peak—without deformation or increased distortion. This allows for greater level settings compared to lacquer masters, improving signal-to-noise ratio while maintaining compatibility with playback systems. An electronic compensation network may also correct for vertical tracking angle errors inherent in the cutting geometry, typically using a 0° vertical modulation angle with delay equalization to align with standard 20° playback styli.[5][6]

Cutting and electroforming process

The cutting phase of direct metal mastering begins with the audio signal being engraved directly into a copper-coated stainless steel disc using a precision lathe equipped with a diamond stylus. The stylus, typically a sharpened diamond tip without burnishing facets and excited at ultrasonic frequencies, traces V-shaped grooves into the soft copper layer without the need for heating, avoiding issues like material adhesion or distortion seen in lacquer-based methods.[5] This process occurs at linear velocities reaching up to 500 mm/s near the outer edge of the disc, with metal shavings generated during engraving continuously removed via a vacuum system to maintain groove integrity.[3] The resulting grooves in direct metal mastering are finer and deeper than those in traditional lacquer discs, typically V-shaped with widths of 20-50 micrometers, benefiting from the metal substrate's rigidity that prevents spring-back and allows for tighter spacing. This stability enables 10-15% more music per side by supporting narrower land areas between grooves while preserving signal fidelity and reducing high-frequency noise by as much as 6 dB.[3][5] Following cutting, the electroforming step involves immersing the engraved disc in a nickel sulfate bath, where an electric current deposits a uniform nickel layer onto the copper surface. This process, lasting 4-6 hours, builds a durable 0.3 mm thick "father" stamper directly from the master, bypassing intermediate silvering and separation stages required in lacquer workflows.[10][11] Quality control during both cutting and electroforming is maintained through real-time monitoring of groove modulation, often employing laser interferometry to verify depth, width, and signal accuracy, ensuring minimal distortion and high reproducibility.[12] Waste management in the process addresses the copper shavings from cutting, which are collected via vacuum and fully recyclable, alongside chemical byproducts from the nickel plating bath that are treated according to environmental protocols to minimize hazardous discharge.[3]

Advantages and limitations

Key benefits

Direct metal mastering (DMM) provides enhanced durability compared to traditional lacquer-based methods, as the metal substrate withstands repeated handling and quality control play tests with less wear, enabling multiple playbacks before significant degradation occurs.[13] This robustness reduces the risk of damage during the stamper production phase, where multiple electroformed copies are derived directly from the master.[3] In terms of precision, DMM minimizes groove distortion due to the stable copper surface, resulting in a higher frequency response that extends effectively to 20-22 kHz and a lower noise floor, often improved by 2-4 dB relative to lacquer cuts.[14] The process allows for 20% narrower groove spacing without compromising playback stability, preserving fine audio details and reducing issues like inner-groove distortion.[3] Efficiency gains in replication are a core advantage, as DMM bypasses the intermediate lacquer-to-metal transfer step, shortening overall production timelines by approximately 1-2 days and permitting the creation of 10-20% more stampers per master cycle through direct electroforming.[15] This streamlined workflow lowers chemical usage and energy demands while maintaining high fidelity in the pressed records.[3] The stable metal medium supports tighter groove packing, extending playable side length by 10-20%, for example, achieving up to 22-24 minutes on a standard 12-inch LP at 33 rpm compared to shorter times with lacquer.[3][13] Archival longevity is bolstered by the copper composition of DMM masters, which resists environmental degradation such as oxidation and humidity-induced warping far better than organic lacquers, making it suitable for long-term preservation of audio archives.[13] This material stability ensures consistent performance over decades, with minimal loss in signal integrity.[15]

Potential drawbacks

Direct metal mastering requires substantial investment in specialized equipment, such as precision lathes and electroforming plating baths, with costs often exceeding $500,000, which restricts its use primarily to large-scale recording studios and pressing facilities capable of justifying the expense. This economic barrier has historically limited widespread adoption, particularly for independent or smaller operations seeking cost-effective vinyl production alternatives.[16] Furthermore, the scarcity of operational DMM lathes—fewer than 20 worldwide as of 2025—limits availability, with challenges from high maintenance costs and import tariffs affecting adoption.[17] Additionally, the chemical electroforming stage generates hazardous nickel-based waste from plating solutions, imposing strict compliance with environmental regulations such as the EU REACH framework implemented in 2007, which adds to disposal costs and regulatory burdens for facilities employing the technique.[8][18] While direct metal mastering enhances durability in final pressings, these operational and economic challenges underscore its suitability mainly for high-volume, professional applications rather than versatile or low-budget productions.[3]

Applications and evolution

Use in analog recordings

In analog recordings, direct metal mastering (DMM) facilitates a streamlined signal path from the source material, typically a 15 ips, 1/4-inch analog tape, through a preamplifier and equalization stage to the cutting lathe. The lathe employs a specialized stereo cutterhead, such as the Neumann SX-80, to incise grooves directly into a copper-coated stainless steel substrate, bypassing the traditional lacquer disc entirely. This analog-to-analog process preserves the tape's inherent warmth and transient response while enabling higher cutting levels and bias adjustments that enhance dynamic range, achieving up to 70 dB in the final disc.[5][19] DMM proves particularly suitable for genres like classical and jazz, where extended dynamic contrasts and precise low-frequency reproduction—down to 20 Hz at near-full amplitude—are essential for capturing orchestral depth or improvisational nuances without distortion. The technique's stability allows for deeper, more consistent grooves in the bass region, reducing inter-groove interactions that could otherwise compromise rumble and low-end clarity in tape-sourced masters.[20][5] During the 1970s and 1980s, DMM became a staple in premium LP production workflows, especially for limited-run audiophile releases, as pioneered by Teldec in collaboration with Georg Neumann GmbH. This method shortened production timelines to about two hours per master for stamper generation and was favored for reissues emphasizing fidelity, such as Teldec's classical catalog, where it reduced surface noise—including quiescent groove noise and impulse disturbances—by up to 6 dB compared to conventional lacquer-based processes.[5][1] In terms of output efficiency, DMM masters yield numerous stampers per plate—often several times more than the limited matrices derivable from a single lacquer—supporting 1,000 or more pressings per stamper with consistent quality, versus 500–800 from lacquer-derived ones before degradation sets in. A notable case is Teldec's 1980 DMM edition of Beethoven's Symphony No. 9, where the process notably improved bass clarity and overall signal-to-noise ratio in the analog mastering chain from original tapes.[5][21]

Integration with digital sources

The integration of direct metal mastering (DMM) with digital audio sources marked a significant adaptation during the 1980s, enabling the technique to bridge analog vinyl production with emerging PCM-based workflows. Early digital systems, such as the Sony PCM-1600 processor introduced in 1978, facilitated this transition by converting 16-bit/44.1 kHz digital signals back to analog for input into the cutting lathe, thereby preserving high-fidelity characteristics originally intended for compact discs in vinyl format.[22] This digital-to-analog conversion process allowed mastering engineers to leverage DMM's precision cutting on copper substrates while accommodating the cleaner, low-noise profiles of digital recordings, contrasting with traditional analog tape sources that often introduced tape hiss and saturation. A notable milestone occurred in the early 1980s, exemplified by Denon's release of digitally recorded LPs using DMM, such as the 1986 pressing of Anton Bruckner's Symphony No. 4, which was recorded in 1981 using digital techniques and mastered via DMM to maintain dynamic range and detail.[23] By the mid-1980s, this approach became common for hybrid releases, where digital precision enhanced analog warmth, as seen in audiophile reissues transferring CD masters to DMM vinyl for improved transient response and reduced surface noise compared to lacquer-based methods.[19] Technical adjustments were essential to optimize DMM for digital inputs, including refined cutting amplifiers and pitch/depth computers like the Neumann VMS-80 to handle the sharper transients inherent in PCM signals, minimizing issues like groove overload without excessive high-frequency roll-off.[24] Equipment evolution further supported this, with integration of digital recorders such as Soundstream's early 16-bit systems and Mitsubishi's X-80 (introduced in 1980), which provided stable digital playback for lathe feeding, enabling higher resolution mastering workflows by the decade's end.[25] These hybrid practices combined digital accuracy with DMM's mechanical advantages, resulting in vinyl pressings that offered extended playing times and superior high-frequency extension, appealing to audiophiles seeking the best of both domains.[19]

Contemporary practices

Since the vinyl resurgence in the 2010s, direct metal mastering (DMM) has experienced a notable revival, particularly in high-end and limited-edition productions. This renewed interest aligns with the broader growth in vinyl sales, which reached over 43 million units in the U.S. in 2023 and over 44 million units in 2024 per the RIAA, driven by demand for premium analog formats.[26] Studios such as Abbey Road have incorporated updated DMM techniques for select releases, including the 2015 reissue of Rush's Permanent Waves, cut directly from original analog tapes on a DMM lathe to achieve enhanced fidelity.[27] Similarly, boutique labels and pressing plants like Pirates Press utilize DMM to bridge digital masters with vinyl, minimizing sonic discrepancies in contemporary releases.[28] Technological advancements in DMM have focused on integrating digital tools for precision, with modern lathes employing computer analysis to simulate and optimize groove paths before cutting into copper plates. This allows for support of high-resolution sources up to 24-bit/96 kHz, reducing distortion and improving high-frequency response compared to traditional lacquer methods.[28] Facilities like GZ Media emphasize DMM's compatibility with current workflows, where the process eliminates intermediate lacquer steps, enabling more stable cuts for complex audio.[1] These updates have lowered production risks, making DMM viable for runs exceeding 5,000 units without the degradation issues of lacquer masters.[3] In niche markets, DMM dominates the audiophile sector, where its clarity and reduced noise floor appeal to collectors seeking superior playback quality.[29] It is also favored for archival remastering projects, preserving historical recordings with minimal alteration, as seen in reissues from labels prioritizing analog authenticity.[30] Sustainability initiatives have further boosted DMM's adoption, with its lower chemical usage—eliminating lacquer solvents—and reduced energy demands positioning it as an eco-friendlier alternative in the 2020s. Pressing plants like Disc Manufacturing Services highlight DMM's environmental benefits, including decreased material transport and waste, aligning with industry shifts toward greener practices.[31] As of 2025, DMM accounts for a growing portion of premium vinyl masters, reflecting its efficiency in boutique and high-fidelity production amid the ongoing vinyl boom.[32]

References

  1. DMM technology - GZ Vinyl
  2. Direct Metal Mastering - Stereo Lab from Pspatial Audio
  3. Guide: Direct Metal Mastering (DMM) - Precision Record Pressing
  4. What Is Direct Metal Mastering? Also Known As DMM
  5. [PDF] DIRECT METAL MASTERING Technology - English.pages - Qobuz
  6. Direct Metal Mastering-- A New Art In LP Records (April 1987)
  7. Blue Note Records: the EMI era, 1979 to present day (updated)
  8. DMM plates processing - GZ Vinyl
  9. http://www.lathetrolls.com/viewtopic.php?t=7134
  10. The Oxidation of Copper in Air at Temperatures up to 100 °C - MDPI
  11. handbook of recording engineering
  12. Lacquer vs DMM – what's the difference in vinyl pressing?
  13. Stereo Lab - Manufacture of gramophone records
  14. [PDF] Studio-Sound-1988-03.pdf - World Radio History
  15. DMM or lacquer cut? Vinyl Mastering Technologies Compared |
  16. Vinyl Mastering Basics | Green Lakes Pressing
  17. Vinyl Pressing and Direct Metal Mastering (DMM) - Solid Merch
  18. purchase a Cutting lathe - Vinyl Engine
  19. Direct Metal Mastering...good or bad? - Steve Hoffman Music Forums
  20. Nickel - Substances restricted under REACH - ECHA
  21. Masters of the Art of Mastering Part 2 - Analog Planet
  22. Lacquer Mastering & Direct Metal Mastering - 24mastering
  23. The Difference Between Lacquer and DMM - dunk!pressing
  24. The Excellent Sony PCM-1600 Digital Audio Processor
  25. Anton Bruckner, Staatskapelle Dresden, Herbert Blomstedt - Sinfonie Nr. 4 Es-dur »Romantische«
  26. TSM - DMM Studios - Total Sonic Media
  27. The Revolutionary Mitsubishi X-80 Digital Recorder - Vintage Digital
  28. Abbey Road Rooms: Mastering Suite 5 with Geoff Pesche
  29. Direct Metal Mastering - The Secret Behind Why Our Records Sound ...
  30. Direct Metal Mastering
  31. Direct Metal Mastering – AudioSoundMusic
  32. DMS Vinyl's Sustainability Policy - Disc Manufacturing Services
  33. [PDF] CONTENT - GZ Vinyl
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