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Autosound 2000 Disc Four

Amplifier Optimizer Test CD

Item # 503CD104

Autosound 2000 has created this series of test CDs for the professional and the serious hobbyist.

Autosound 2000 has created this series of test CDs for the professional and the serious hobbyist.

Discontinued item

Item # 503CD104

About the Autosound 2000 Disc Four

Autosound 2000 has created this series of test CDs for the professional and the serious hobbyist. Each disc is designed to test a specific performance parameter of your vehicle's audio system.

Autosound 2000 has created this series of test CDs for the professional and the serious hobbyist. Each disc is designed to test a specific performance parameter of your vehicle's audio system.

Disc Four is billed as the Ultimate Amplifier Level Setting Disc. The name says it all.

Please call a Sales Advisor for a complete track listing. You save about $10 when you buy the 5-disc set.

What's in the box:

  • CD 4: Setting Amplifier Levels
  • How-to-use information booklet
MFR #CD104

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More details on the Autosound 2000 Disc Four

Mark G.

Product Research

Disc 4: Setting Amplifier Levels

  • Track 1: Sample from Sheffield lab's "Sonic Detour" by Freeway Philharmonic, serves as an audio reference

Tracks 2-6 demonstrate the subjective increase in loudness that can be obtained by providing a specified amount of "gain overlap" at the power amp of an audio system. Although gain overlap can increase the usable loudness of a system, it is a compromise. For every dB of increased loudness, there is an equal decrease in the signal-to-noise ratio at lower listening levels. There is also an increase in peak distortion at high listening levels. Good system performance is a result of optimizing the trade-offs:

  • Track 2: Demonstrates 0 dB of gain overlap
  • Track 3: Demonstrates 5 dB of gain overlap
  • Track 4: Demonstrates 10 dB of gain overlap
  • Track 5: Demonstrates 15 dB of gain overlap
  • Track 6: Demonstrates 20 dB of gain overlap

Tracks 7-12 are used for setting the max level (clipping threshold) of electronic components:

  • Track 7: 40 Hz @ 0dBFS useful for adjusting subwoofer crossover)
  • Track 8: 100Hz @ 0dBFS useful for setting midbass of an electronic crossover
  • Track 9: 400Hz @ 0dBFS useful for x-over setting at this frequency
  • Track 10: 1kHz @ 0dBFS used to set x-over midrange output
  • Track 11: 4kHz @ 0dBFS useful to set tweeter output of an electronic crossover
  • Track 12: 8kHz @ 0dBFS useful to set tweeter output of an electronic crossover

Tracks 13-18 are used to obtain 5 dB of gain overlap:

  • Track 13: 40 Hz @ -5 dBFS
  • Track 14: 100 Hz @ -5 dBFS
  • Track 15: 400 Hz @ -5 dBFS
  • Track 16: 1 kHz @ -5 dBFS
  • Track 17: 4 kHz @ -5 dBFS
  • Track 18: 8 kHz @ -5 dBFS

Tracks 19-24 are used to obtain 10 dB of gain overlap:

  • Track 19: 40 Hz @ -10 dBFS
  • Track 20: 100 Hz @ -10 dBFS
  • Track 21: 400 Hz @ -10 dBFS
  • Track 22: 1 kHz @ -10 dBFS
  • Track 23: 4 kHz @ -10 dBFS
  • Track 24: 8 kHz @ -10 dBFS

Tracks 25-30 are used to obtain 15 dB of gain overlap:

  • Track 25: 40 Hz @ -15 dBFS
  • Track 26: 100 Hz @ -15 dBFS
  • Track 27: 400 Hz @ -15 dBFS
  • Track 28: 1 kHz @ -15 dBFS
  • Track 29: 4 kHz @ -15 dBFS
  • Track 30: 8 kHz @ -15 dBFS

Tracks 31-35 are the same as tracks 2-6. However, the levels of these tracks have been adjusted to compensate for the loudness increase:

  • Track 31: Reference track with 0 dB gain overlap
  • Track 32: 5 dB of gain overlap w/recording level lowered 4.9dB
  • Track 33: 10 dB of gain overlap w/recording level lowered 9.4 dB
  • Track 34: 15 dB of gain overlap w/recording level lowered 13.3 dB
  • Track 35: 20 dB of gain overlap w/recording level lowered 16.2 dB

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