When Hupfeld offered the DEA Reproduction System from 1907, Hupfeld could already fall back on the Phonoliszt or Phonola artist recordings, which had been recorded at least since 1905. Although it is still unclear what the recording equipment was like, the result, the DEA reel, is an excellent reproduction reel. Analysis clearly shows that the Phonola reels and the DEA reels contain exactly the same hand play. We have the assumption that Hupfeld had a DEA recorder from the very beginning, i.e. around 1904 - just not a marketable reproduction piano. This was a dilemma, as it meant that Welte, as the market leader, could never again be caught up in the field of reproduction pianos.
The DEA music rolls are unusually wide at 40.5 cm - the widest reproduction roll. These original music rolls are very rarely found - especially since there are very few playable DEA instruments left. Paper (with horn field watermark), spool and sides are very similar to the Phonola music rolls. The mostly wine-red boxes have the label on the front with the roll number, the title and the name of the pianist. The same label can also be found on the roll - often next to a photo of the pianist. This roll also runs from bottom to top. At the beginning of the roll, the date of manufacture is usually also written on the back. There is a hook at the beginning of the roll to hang it on the recording reel.