Using Series Resistors for Audio Sources: Is Jumpering Channels Safe?

In summary, a passive summing mixer uses series resistors to limit voltage from multiple sources in order to prevent overdriving the destination. Jumping left and right channels from two audio sources can have serious repercussions for the destination. This has been a common practice in the AV industry to create a mono signal, but it is now being advised against. Not using a mixer can result in distortion due to impedance mismatch, though the extent of this will vary depending on the source material.
  • #1
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My understanding of a passive summing mixer is to use series resistors to limit the voltage from multiple sources so as to not over drive the destination? If you are combining two audio channels say from a VCR and jumper the left and right channel will this have serious reprocutions for the destination? For years in the AV business, I and many others, have been jumpering left and right channels on singal source to make a mono signal without using a summing mixer. I am being told this should never be done?? Anyone prove or disporve this?
 
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  • #2
Not using a mixer will cause distortion due to impedence mismatch.

How much you will notice this depends on the source material.
 
  • #3


Jumpering channels in audio sources can be a useful technique in certain situations, but it is important to understand the potential risks and limitations. In a passive summing mixer, series resistors are used to limit the voltage from multiple sources to prevent overdriving the destination. This can be a helpful way to combine audio signals and create a balanced mix.

However, when it comes to jumpering channels, it is important to consider the potential consequences for the destination. Jumpering left and right channels to create a mono signal may work in some cases, but it is not a foolproof solution. This technique can potentially cause phase cancellation and other issues in the audio signal, resulting in a less than desirable sound quality.

Furthermore, it is always recommended to use a proper summing mixer for combining audio signals, rather than relying on jumpering channels. Summing mixers are designed specifically for this purpose and will provide a cleaner and more accurate mix.

In the end, whether or not jumpering channels is safe depends on the specific equipment and circumstances. While it may have worked in the past, it is always best to use the proper tools and techniques for the best audio quality. I would recommend consulting with a professional audio engineer or doing further research to determine the best approach for your specific needs.
 

1. What is the purpose of using series resistors for audio sources?

The purpose of using series resistors for audio sources is to match the impedance of the audio source with the load impedance of the amplifier. This helps to prevent distortion and improve overall sound quality.

2. How do series resistors affect the sound quality of audio sources?

Series resistors can affect the sound quality of audio sources by reducing the voltage and current levels, which can help to prevent clipping and distortion. Additionally, series resistors can help to balance the output levels of different audio channels.

3. Is it safe to jumper channels using series resistors?

Yes, it is generally safe to jumper channels using series resistors. However, it is important to ensure that the resistors are of the correct value and rated for the appropriate power levels to prevent damage to the audio equipment.

4. Can series resistors be used with all types of audio sources?

Series resistors can be used with most audio sources, including CD players, turntables, and media players. However, it is important to check the impedance of the audio source and the recommended load impedance of the amplifier before using series resistors.

5. Are series resistors necessary for all audio setups?

No, series resistors are not necessary for all audio setups. They may be more beneficial for setups with multiple audio sources and amplifiers, or for setups with mismatched impedance between the audio source and amplifier. It is always best to consult with a professional or do thorough research before implementing series resistors into an audio setup.

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