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Old 28th October 2010, 04:24 AM   #1
Shike is offline Shike  United States
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Join Date: Jun 2007
Default LM1875 & phase angle, is it enough?

Greetings everyone,

I have a question about phase angle of speakers in impedance measurements and specifically, how does it impact the load on amplifiers? I currently have a LM1875 gainclone, and want to know generally how angle determines whether the load will be too hard for it or not. For example, 5.5ohms at a -45 degree phase.

tldr: The speakers have an 85dB @ 1w/1m sensitivity, and I listen from 2m away. How loud can I go before the amp clips, and does phase impact whether it clips earlier? If so how do I figure this.

Thanks.

Last edited by Shike; 28th October 2010 at 04:26 AM.
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Old 28th October 2010, 10:58 AM   #2
AndrewT is offline AndrewT  Scotland
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read ESP on this topic.
There are other Websites that look at reactive speaker loadings and the effect it has on the amplifier.

This is not a minor problem. It is complex and serious. It can blow up amplifiers.
It will activate the Spike protection in a 3886. What protection/limiting is built into the 1875?
It can ruin the sound quality if you try to play inappropriate sound levels from an amp that is severely current limiteHow loud can I go before the amp clips, and does phase impact whether it clips earlier? If so how do I figure this.d by design.
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How loud can I go before the amp clips, and does phase impact whether it clips earlier? If so how do I figure this.
when it starts to sound horrible as you turn up the volume, then turn it back down again.
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regards Andrew T.

Last edited by AndrewT; 28th October 2010 at 11:01 AM.
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