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.
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:
Autosound 2000 Disc Four owner's manual
- CD 4: Setting Amplifier Levels
- How-to-use information booklet
Reviews
Customer reviews
Loading reviews...
Autosound 2000 Disc Four reviews
Average review:
Thanks for submitting your review
Customer photos
This review was collected as part of a promotion
Pros:
Cons:
More details on the Autosound 2000 Disc Four
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
Loading accessories...
Customer Q&A
Loading articles...
Very handy for setting amp gains with overlap. Examples tracks are useful in choosing a gain overlap level that suits your tastes. Instructions are included so usage should be clear.
TBSS from Monument, CO