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Comparison Tests
various components used in the remanufacture of Ampex ATR-100‘s MDIprecision vs. ATR Service Co. Contents
1. Pictures and Prices
2. 1/3 Octave Swept Response - Record/Play - Flux Magnetics heads vs. EMC-Electromag (1/2“) 3. THD @ 1 kHz - Record/Play - Flux Magnetics heads vs. EMC-Electromag (1/2“) 4. 1/3 Octave Swept Response - Input-to-Output - ATR Service Co.‘s Transformerless I/O vs. MDI Precision’s Xiron™ __Transformerless I/O 5. THD @ 100 Hz - Input-to-Output - ATR Service Co.‘s Transformerless I/O vs. MDI Precision’s Xiron™ Transformerless I/O 6. THD @ 1 kHz - Input-to-Output - ATR Service Co.‘s Transformerless I/O vs. MDI Precision’s Xiron™ Transformerless I/O 7. Noise Floor - I/O - ATR Service Co.‘s Transformerless I/O vs. MDI Precision’s Xiron™ Transformerless I/O (broadband __unweighted) 8. I/O square wave response - 100 Hz (Xiron vs. Ampex OEM I/O) and 20 Hz (ATR Service (SSI) vs. Ampex OEM I/O) 9. THD+Noise vs. Frequency and THD+Noise vs. Amplitude - Input-to-Output Xiron vs. Ampex OEM I/O - by Ap System __One dual domain 10. Customer Feedback
The data collected by way of our SoundTechnology (STI) system is not represented as absolute. The STI system is PC based and has some bandwidth limitation (96 kHz sampling) and slight self distortion. Although close, we do not represent distortion or swept response values as absolute. It is true, however, that given identical tests, if Product A exhibits .006% THD and Product B, .011% THD, the conclusion is clear. Furthermore, since the reponse of the test system is "flat" unto itself, deviations from flat response are, infact, the result of equipment under test.
This comparative data was initially gathered for our own reference and so, for the record, all testing was performed numerous times and conducted in a fair, accurate and scientific manner with the intention of demonstrating the best case performance of each and every tested component. For control, the same set-up was used for all similar tests. i.e. magnetic heads were compared on the same machine using the same electronics. Electrical adjustments, such as bias and EQ, were made so as to optimize the performance of the recorder in each and every case. We find the STI system particularly useful for the very detailed FFT Spectrum displays and it is the SoundTechnology system which we use daily in our work. From time to time, we rent an Ap system to validate the accuracy of our own hardware and software; hence, the inclusion of some Ap data. This presentation is for comparison sake and since all tested components were given identical treatment - the included data is absolutely valid to that end. These tests do by no means represent the entire picture and we make no claims here as to “the sound” of a component or a piece of equipment. The reader/listener is left to make that determination. All that said, the time has come to set the record straight! The following is what our competition fears most -- Some undeniable proof that he has no lead in the race to build the best analog recorder!
Copyright 2001. MDI PrecisionMotorWorks __241 White Pond Rd. Hudson MA 01749 USA
The following may not be reproduced for distribution or used in any publication without the express written consent of MDI PrecisionMotorWorks. |
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