qlogored.jpg (8515 bytes) 472 Studio Audio Cassette IEC Type II

472 High Bias Analog Cassette for the Most Demanding Applications



  • Full Range of Cassette Lengths
  • Improved Electrical Performance
  • New Polycarbonate Shell for Maximum Product Protection
  • Packaging That Makes Sense

Quantegy 472 Studio Audio Cassette products are available in 10, 20, 30, 45, 60 and 90 minute configurations to give the user the option to precisely match the cassettes to the program requirements.

The tape utilized in Quantegy 472 cassettes is a special High Bias formulation that meets the IEC Type II requirements for High Performance cassette products.

Our 472 cassettes utilize a packaging scheme that is more user and environmentally friendly. Master cartons contain forty individually wrapped units. This packing system eliminates the inner carton and reduces the amount of packaging waste. The extended J-card provides plenty of room for notes about the recording. The J-card also features a number of check boxes to speed the identification and documentation of each cassette.

472 Studio Audio Cassettes offer superior performance, unsurpassed reliability, and outstanding audio quality. Each component of 472 has been carefully designed to meet the exacting standards of the most discriminating cassette user.

472 binder enhances the particle performance to ensure that both the high and the low frequency sounds are reproduced accurately.

Quantegy 472 cassettes utilize a precision five screw cassette shell made of a high-performance polycarbonate material. The polycarbonate material also increases the stiffness and the impact resistance of the shell. The high-impact resistance of the shell material makes Quantegy 472 cassettes less vulnerable to damage from rough handling. The shell also features a new smaller window that further adds to the rigidity of the shell itself.

472 Studio Audio Cassette IEC Type II

Technical Data

Unit Typical Value Test

I. Physical Properties

Base Material Polyester
Oxide Coating Thickness mils (m m) 0.18 (4.6)
Total Tape Thickness
C10 through C60 Tapes mils (m m) 0.63 (16.0)
C90 Tape mils (m m) 0.44 (11.2)
Shell Type Precision 5-screw with floating bridge
Shell Material Advanced polycatonate
Pressure Pads Oversized wool felt pad suspended on a bronze spring
Slip Sheet Double twin-ribbed design
Window Sonic welded
Roller Guides Oversized rollers with silicone-lubricated steel pin inserts

II. Magnetic Properties
Coercivity (Hc) Oe (kA/M) 675 (54) 1
Retentivity (Br) Gs (mT) 1700 (170) 2

III. Electro-Magnetic Properties
Recommended Bias dB 1.5 2
Maximum Output Level for 3% Third Harmonic Distortion @ 31 5Hz dB 4.4 3
Maximum Output Level for Tape Saturation @ 10 kHz dB -4.5 4
Relative Sensitivity (dB) 5
@ 315 Hz dB -0.4
@ 3150 Hz dB -1.1
@ 10 kHz dB 0.0
@ 12.5 kHz dB 0.8
Distortion @ 31 5 Hz % 0.9 6
Signal-to-Noise Ratio @ 315 Hz dB -64.4 7
Reference Level to Bias Ratio, Weighted @ 315 Hz dB -60.0 8
Reference Level to Print Ratio @ 500 Hz dB 55.0 9

IV. Measurement Conditions
Reference Level nWb/m 250 10
Tape Speed ips (CM/8) 1.875 (4.76)
Track Width mils (mm) 24 (0.61)
Record Head Gap Length mils (um) 0.16 / 4
Reproduce Equalization m sec 70 + 3180
Operating Conditions 20° C/68° F & 45% RH

Test Notes

  1. Coercivity is the magnetic field required to reduce the magnetization of a saturated magnetic specimen to zero. The Coercivity is a direct measure of the bias current requirement of a tape.

    Retentivity is the maximum remanent magnetization possible in a magnetic material. The long wavelength saturated output is directly proportional to the retentivity.

    Coercivity and retentivity values are obtained from a 60 Hz B-H loop tester with 1000 Oersted field calibrated to that maintained by the National Bureau of Standards.
  2. Recommended bias is determined by the alternate method specified under JEC 94 Pan S. The optimum bias is obtained by adjusting the bias current to obtain the maximum output at 6.3 kHz at -20 dB input level. Bias is then increased until the output decreases by 2 dB.
  3. Maximum output level for 3% third harmonic distortion is the output level at 315 Hz where a 3% third harmonic distortion is observed. The measurement is given relative to the reference level when recording at the recommended bias setting.
  4. Maximum output level for tape saturation is that value of the output level at 10 kHz when the tape has reached saturation (an increase in record level will not give an increase in output level). The measurement is given relative to the reference level when recording at the recommended bias setting.
  5. Relative sensitivity is the difference in output level between the IEC reference tape and the tape being measured. The record level is set to give an output level 20 dB below the reference level. The recording is made at a constant record level at the specified frequencies while recording at the recommended bias setting.
  6. Third harmonic distortion is the ratio between the level of the third order harmonic and the fundamental frequency (315 Hz) expressed as a percent when recorded at the reference level and recommended bias settings.
  7. Signal-to-noise ratio is the sum of the relative weighted noise with bias and the relative output with a 3% distortion at 315 Hz.
  8. Reference level to bias noise ratio is made with no input. Recorded tape is played through an NAB "A" weighted filter, and level is measured relative to the reference level with an RMS meter.
  9. Reference level to print ratio compares the contact-induced signal transfer to an adjacent layer of tape of a recorded signal. This phenomenon is temperature dependent. A 500 Hz print signal is recorded onto one layer of tape at the IEC reference level and bias then conditioned for 24 hours at 70° F (22° C) before measured.
  10. Reference level corresponds to the tape flux at 250 nWb/m recorded on the IEC reference tape.

Specifications are subject to change without notice.

472 Configurations


Tape Length
Feet / Meters

Carton Wt.
Lbs. / Kgs.


472-ClOPB0H 10 Minutes






472-C20PB0H 20 Minutes






472-C30PB0H 30 Minutes






472-C45PB0H 45 Minutes






472-C60PB0H 60 Minutes






472-C90PB0H 90 Minutes