Amplifier channel balance test

[SansuiRav]

Just wanted to see what people thought of this bloke on YouTube I am following
Was going to give it a try on my Marantz 2238 old receiver and a couple of Sansui amps
Is your Amplifier & Speakers Balanced Correctly, Stereo Channel Tune Up using Audacity, Hifi Vintage - YouTube

Rav.

 

[wrankin]

An interesting experiment. I like it from the aspect of demonstrating actual measured differences in components. Just for giggles I pulled out a 100k ALPS pot I have and it showed similar variation.

Now I didn't have the time to go through the entire 30 minute video but did I miss the part where he indicates that any of these differences are actually audible? I mean it's probably a good thing, especially in the DIY community, to make sure that the output levels on different channels are equal and tweak things where they need it but I suspect that you can really go off into the weeds on this.

If nothing else I know that my hearing sensitivity is different on my right and left sides. This probably nullifies any difference I would hear from slight differences in channel volume.

Your milage may vary.

-bill

 

[ejp]

Nothing new here. It's been known for decades that stereo volume pots track poorly at the bottom end. That's why we went to stepped attenuators. And we didn't need a 27 minute video to show something that follows directly from the equations.

 

[SansuiRav]

Thanks for the responses,

I did end up given this ago, I used a mp3 player for a 1khz tone I found.
Did test with just mp3 player connected to Audacity then with all 3 amps and 2 were low on one channel, Marantz was the worse as I suspected and confirmed by test
Will now look to see if I can get the receiver serviced

Rav

 

[ejp]

What you need is not a service but a better quality volume pot.

 

[SansuiRav]

What you need is not a service but a better quality volume pot.

Ok I will try and sort this out when getting it looked at

Thanks
Rav