That is pretty typical for an Otari 5050 deck with a high quality tape.
The ATR MasterTape shows a flat frequency response +/- 2db from about 60Hz to 20Khz at 7 ½ IPS, and about 40Hz to 22Khz at 15 IPS. The scale used for our images below show clearly what each frequency response is. While 10db per vertical division seems to be a very coarse scale, keep in mind that typical tape deck measurements are done 20-20Khz at +/-3db, for a total allowable variation of 6db between the lowest amplitude frequency and the highest amplitude frequency. Each vertical division is 10db, with the frequency plot going from 20Hz at the far left to 20Khz at the far right. All frequency response measurements were made at -20db.Īs a refresher, the picture to the right shows how to read our Soundtech 1510A tape analyzer. We then ran frequency response tests of the more popular brands of tape that we had on our test bench. We set the recording and playback to be as flat as possible at both speeds with ATR MasterTape, tweaking the bias and eq controls as required. The tape deck is running at 7 ½ and 15 IPS, and is a ½ track machine, using the full width of the tape in one direction.
Our test setup is a good working Otari 5050 Mk 1 with good heads, and a Soundtech 1510A tape deck analyzer.
Disclaimer: This is by no means a definitive test between tape brands and models, however it does show some of the basic differences between the various formulations.
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