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RECORDING THE MASTERS SM900 - 1/4 inch x 2500 feet on 10.5 inch Metal Reel

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Original price $ 139.99
Current price $ 96.00
SKU RTM-R34620

RTM SM900 is a premium high output audio tape, back-coated studio and archive tape, designed for use in music studios for multi-track and mastering recording. The SM900 formulation features uniform performance through even the highest frequencies.

Specifically designed for multi-track and mastering recording, the Studio Master 900 series offers high levels of uniformity up to the highest frequencies, as well as excellent DC noise and winding, even at high speeds.


  • Widths: 1/4″ 1/2″ 1″ 2″
  • Operating level up to +9dB
  • Backcoated
  • Multitrack formats
  • Mastering-grade quality
  • Low print-through
  • Excellent signal-to-noise ratio
  • Wide dynamic range

RTM owns the original formulas created by AGFA & BASF which have proved their high quality in the audio professional recording field for several decades. Product range has changed along years but the premium magnetic formulas have remained and are still manufactured : SM900 ; SM911 ; LPR35 ; LPR90.

RTM tapes are compatible with all machines and provide equivalent operating levels to traditional brands as BASF, EMTEC, RMGI, AMPEX, QUANTEGY and more to fit every usage and sound taste.

SM-900 is equivalent to the follow legacy tapes:


  • 499 Grand Master Gold Studio 
  • GP9 Grand Master Platinum Studio


Part Number


Reel Type or Pancake

Metal Reel

Hub Type


Box Type


Tape Width (in, mm)

.25 / 6.3

Tape Length (ft, mm)

2,500 / 762

Reel Diameter (in, mm)