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Old 16th February 2003, 07:22 PM   #1
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Default Experts needed: Crazy phase issue with Inverted Gainclone

I have having major phase issues with my bass. I wired everything correctly. With my speakers and my old amp, bass sounded great with the speakers in phase with each other. Now I have it wired up in phase and the low bass is really bad. Then when I wire them out of phase with each other, the bass is better, but not what it should be. I have verified this by connecting just one speaker, and then seeing how much better the bass was after connecting the second. With the speakers wired in phase, the bass completely vanishes. With the speakers out of phase, the bass gets better but seems weird, and definitely not to the point that my previous am was. Up until now, I had only run single channel gainclones when I was expiramenting, and I was incredibly impressed with the bass.

To sum it up, and this has been verified time and time again, the bass is gone when the speakers are in phase, the soundstange is in front of me, but is not well defined.
When I wire one out of phase with the other, the bass is marginaly improved, but the soundstage is crazy like it is when you reverse polarity

I have checked and re-checked everything, please let me know if you have any ideas that could help me out.

Thanks,
Paul Hilgeman
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Old 16th February 2003, 07:31 PM   #2
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Lightbulb Phase

Hi paul,
Check the phase of the bass speakers or that they are equally connected with a 1.5V battery. Convention is that the speakercone moves forwards when the "hot" or red terminal is connected to the plusside of the battery. Hope this helps.
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Old 16th February 2003, 07:42 PM   #3
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Yes, they are correct, like I said, I have had these speakers for a while, and had them connected to another amp before, and they sounded great.

Thanks for the idea though,
Paul Hilgeman
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Old 16th February 2003, 08:39 PM   #4
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Can you post shematic of the gainclone that you are using?
What speakers are those?
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Old 16th February 2003, 08:51 PM   #5
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Here is the exact image of what I am using. one for each channel.

-Paul
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File Type: gif invertedlm3875.gif (6.5 KB, 427 views)
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Old 16th February 2003, 08:53 PM   #6
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Oh yeah, and the speakers are the Dayton III's. They are DEFINITELY not bass shy.

Here is a picture:
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Old 16th February 2003, 09:10 PM   #7
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What is the reason for 15K resistor to ground right after the pot?
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Old 16th February 2003, 09:13 PM   #8
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I got that from the ESP "Better Volume Control"

http://sound.westhost.com/project01.htm

I have used it both ways, I still have the phase issue with or without it.

-Paul
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Old 16th February 2003, 09:18 PM   #9
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Did you tried coupling cap after the pot?
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Old 16th February 2003, 09:22 PM   #10
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No, I have not tried that, but I dont see how that would affect the phase, do you?

-Paul
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