Precision Test Signals

The frequency response sounds were useful. I found out that neither I nor my wife can hear anything above 8K. We could both hear 20Hz reasonably and 25 Hz well. The disc doesn't have everything for stereo setup, but is a good value. A sample of pink noise would have been interesting/useful.

It's exactly what I needed to check a sound system and also to check myself for high frequency hearing loss. I'd buy it again.

It seems natural to want to have a library of test tones to be able to individually select and play through the multi-channel audio system you pieced together from the finest components and speakers you could justify. Unless you evaluate your audio system using a non-subjective means such as this collection of primarily pure frequencies (and a dB meter), how will you ever know when its time to stop spending money? Or be able to prove scientifically beyond a shadow of a doubt that, yes, you actually did need to buy different speakers or invest $800 in Auralex acoustical room treatment? Not sure if your subwoofer is sub enough? I recommend cranking up track #7 for 10 glorious seconds of 5 Hz. Be careful-- you could fry something! I recommend this disc as a useful tool. I fault it a star because there is no printed track listing that comes with it. So I made my own-- see below. Track 01 Introduction 1:26 Track 02 (Track 03 Introduction) 0:11 Track 03 QUICK SWEEP 20 Hz - 20.480 kHz Quick Frequency Check 0:10 Track 04 SLOW SWEEP 40Hz - 20kHz Quick Frequency Check 2:32 Track 05 (Quick Frequency Check Complete) 0:04 Track 06 (Track 07 Introduction) 0:04 Track 07 5Hz Detailed Frequency Check 0:10 Track 08 (Track 09 Introduction) 0:04 Track 09 6Hz Detailed Frequency Check 0:10 Track 10 (Track 11 Introduction) 0:04 Track 11 8Hz Detailed Frequency Check 0:10 Track 12 (Track 13 Introduction) 0:04 Track 13 10Hz Detailed Frequency Check 0:10 Track 14 (Track 15 Introduction) 0:04 Track 15 13Hz Detailed Frequency Check 0:10 Track 16 (Track 17 Introduction) 0:04 Track 17 16Hz Detailed Frequency Check 0:10 Track 18 (Track 19 Introduction) 0:04 Track 19 20Hz Detailed Frequency Check 0:10 Track 20 (Track 21 Introduction) 0:04 Track 21 25Hz Detailed Frequency Check 0:10 Track 22 (Track 23 Introduction) 0:04 Track 23 32Hz Detailed Frequency Check 0:10 Track 24 (Track 25 Introduction) 0:04 Track 25 40Hz Detailed Frequency Check 0:10 Track 26 (Track 27 Introduction) 0:04 Track 27 50Hz Detailed Frequency Check 0:10 Track 28 (Track 29 Introduction) 0:04 Track 29 63Hz Detailed Frequency Check 0:10 Track 30 (Track 31 Introduction) 0:04 Track 31 80Hz Detailed Frequency Check 0:10 Track 32 (Track 33 Introduction) 0:04 Track 33 101Hz Detailed Frequency Check 0:10 Track 34 (Track 35 Introduction) 0:04 Track 35 127Hz Detailed Frequency Check 0:10 Track 36 (Track 37 Introduction) 0:04 Track 37 160Hz Detailed Frequency Check 0:10 Track 38 (Track 39 Introduction) 0:04 Track 39 202Hz Detailed Frequency Check 0:10 Track 40 (Track 41 Introduction) 0:04 Track 41 254Hz Detailed Frequency Check 0:10 Track 42 (Track 43 Introduction) 0:04 Track 43 320Hz Detailed Frequency Check 0:10 Track 44 (Track 45 Introduction) 0:04 Track 45 403Hz Detailed Frequency Check 0:10 Track 46 (Track 47 Introduction) 0:04 Track 47 508Hz Detailed Frequency Check 0:10 Track 48 (Track 49 Introduction) 0:04 Track 49 640Hz Detailed Frequency Check 0:10 Track 50 (Track 51 Introduction) 0:04 Track 51 806Hz Detailed Frequency Check 0:10 Track 52 (Track 53 Introduction) 0:04 Track 53 1.016kHz Detailed Frequency Check 0:10 Track 54 (Track 55 Introduction) 0:04 Track 55 1.280kHz Detailed Frequency Check 0:10 Track 56 (Track 57 Introduction) 0:04 Track 57 1.613kHz Detailed Frequency Check 0:10 Track 58 (Track 59 Introduction) 0:04 Track 59 2.032kHz Detailed Frequency Check 0:10 Track 60 (Track 61 Introduction) 0:04 Track 61 2.560kHz Detailed Frequency Check 0:10 Track 62 (Track 63 Introduction) 0:04 Track 63 3.225kHz Detailed Frequency Check 0:10 Track 64 (Track 65 Introduction) 0:04 Track 65 4.064kHz Detailed Frequency Check 0:10 Track 66 (Track 67 Introduction) 0:04 Track 67 5.120kHz Detailed Frequency Check 0:10 Track 68 (Track 69 Introduction) 0:04 Track 69 6.451kHz Detailed Frequency Check 0:10 Track 70 (Track 71 Introduction) 0:04 Track 71 8.128kHz Detailed Frequency Check 0:10 Track 72 (Track 73 Introduction) 0:04 Track 73 10.240kHz Detailed Frequency Check 0:10 Track 74 (Track 75 Introduction) 0:04 Track 75 12.902kHz Detailed Frequency Check 0:10 Track 76 (Track 77 Introduction) 0:04 Track 77 16.255kHz Detailed Frequency Check 0:10 Track 78 (Track 79 Introduction) 0:04 Track 79 20.480kHz Detailed Frequency Check 0:10 Track 80 (Track 81 Introduction) 0:12 Track 81 SLOW SWEEP 5Hz - 20.480kHz Detailed Frequency Check 1:00 Track 82 (Track 83 Introduction) 0:04 Track 83 FULL SPECTRUM WHITE NOISE Detailed Frequency Check 1:00 Track 84 (Detailed Frequency Check Suite Complete) 0:05 Track 85 (Track 86 Introduction) 0:04 Track 86 1Hz SQUARE WAVE Phase Response Suite 0:10 Track 87 (Track 88 Introduction) 0:04 Track 88 10Hz SQUARE WAVE Phase Response Suite 0:10 Track 89 (Track 90 Introduction) 0:04 Track 90 100Hz SQUARE WAVE Phase Response Suite 0:10 Track 91 (Track 92 Introduction) 0:04 Track 92 1.0kHz SQUARE WAVE Phase Response Suite 0:10 Track 93 (Track 94 Introduction) 0:04 Track 94 4.410kHz SQUARE WAVE Phase Response Suite 0:10 Track 95 (Phase Response Suite Complete) 0:04 Track 96 (Track 97 Introduction) 0:04 Track 97 1.0kHz SINUSOIDAL AT MAX LEVEL Saturated Distortion Suite 1:00 Track 98 (Track 99 Introduction) 0:08 Track 99 50Hz + 5kHz SINUSOIDAL Saturated Distortion Suite 1:00

The test tones were on par and helped tune a 5 amp system which normally would have taken forever!!! Anyway the best was the gap inbetween tones. It allowed plenty of time to change my oscilloscope connection.

I need more information about this product. While testing the frequency response using the series of precise sinusoids ranging from 5 Hz to 20,480 Hz, I noticed that the signal amplitude of the tones drops off by more than 50% as the spectrum approaches its upper limit. However, the measured frequencies themselves are accurate. For the test, I analyzed the output of the CD using both an oscilloscope and a spectrum analyzer. I find it hard to believe that my CD player could be performing this poorly. Is there something I might be overlooking or misunderstanding? Looking forward to your insights...

Great for setting up sound system

I was expecting more, something more professional to test and calibrate speakers and individual drivers. Many free ones like this online from Audio and DIY sites that I already have. I was hoping this would have recordings without the clicks between test, also the test signals are too short when using equipment to calibrate, doesn't give enough time. Only about 1/4 of the actual CD is used so it had plenty of space to add more time. I think it's overpriced for what you get. For basics it's fine but can be had for much less!

I would have liked more left end right sounds instead of both at same time. The pink noise was good to check that both channels were coming through well balanced, i.e. in the center as it is supposed to be.