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Old 8th June 2012, 07:00 PM   #751
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Quote:
Originally Posted by AndrewT View Post
I find that setting F-3dB to 5Hz, giving F-1dB ~ 10Hz, cuts sufficient of the low Bass frequencies of music reproduction to reduce the fidelity that reduces my satisfaction with what I prefer. I recommend you aim for F-3dB of between 1Hz and 2Hz for a truly wideband capable amplifier.
Really? This seems extreme because only very large, or extremely inefficient, speakers will be F-3db at 20hz, so the amplifier being F-3db at 5hz, or 10hz should be completely unnoticeable. By 10hz you are well outside the audible range. Are you sure any differences you perceived were not caused by other factors?
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Old 8th June 2012, 07:01 PM   #752
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I am sure.
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Old 8th June 2012, 07:09 PM   #753
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AndrewT: Thanks for the calculations for this amp. Is there a place where ALL the formulas are given so that these calculations could be done for any amp.

Are your calculations in post 751 based on the number of output devices, therefore their individual current handling specs?
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Old 9th June 2012, 01:54 AM   #754
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Originally Posted by Krisfr View Post
AndrewT: Thanks for the calculations for this amp. Is there a place where ALL the formulas are given so that these calculations could be done for any amp.

Are your calculations in post 751 based on the number of output devices, therefore their individual current handling specs?

I think those are best "guesstimates" for output power in terms of power supply. Andrew is not too far off though because it is true that power in is (often less) equal to power out.
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Old 9th June 2012, 10:57 AM   #755
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.........Are your calculations in post 751 based on the number of output devices, therefore their individual current handling specs?
these are based only on the 2pr output stage driven by a single pr driver stage. This amplifier does not have a pre-driver stage and so cannot drive high transient currents into low impedance and reactive loadings. It can drive low resistance loading. It can also drive reactive speakers. It cannot drive low impedance AND reactive speakers.

Now back to output stage design. You need to copy exactly what is given, or learn how to correctly design for reliable temperature de-rated SOAR for your proposed output stage.
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Old 9th June 2012, 10:58 AM   #756
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Originally Posted by JojoD818 View Post
I think those are best "guesstimates" for output power in terms of power supply. Andrew is not too far off though because it is true that power in is (often less) equal to power out.
Jojo,
how did you arrive at your conclusions?
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Old 9th June 2012, 03:24 PM   #757
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Quote:
Originally Posted by AndrewT View Post
these are based only on the 2pr output stage driven by a single pr driver stage. This amplifier does not have a pre-driver stage and so cannot drive high transient currents into low impedance and reactive loadings. It can drive low resistance loading. It can also drive reactive speakers. It cannot drive low impedance AND reactive speakers.

Now back to output stage design. You need to copy exactly what is given, or learn how to correctly design for reliable temperature de-rated SOAR for your proposed output stage.

So you are saying this can't drive a 4 ohms subwoofer?
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Old 9th June 2012, 03:25 PM   #758
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Did you forget to read my post?
Quote:
30+30Vac gives ~ +-42Vdc & ~ 70 to 80W into 8r0 and suits 4ohms speaker
35+35Vac gives ~ +-50Vdc & ~ 100 to 110W into 8r0 and suits 4ohm speaker
40+40Vac gives ~ +-59Vdc & ~ 140 to 160W into 8r0 and possibly suits 6ohms speaker
45+45Vac gives ~ +-68Vdc & ~ 190 to 210W into 8r0, does not suit lower impedance speaker.
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Old 9th June 2012, 03:29 PM   #759
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Jojo,
how did you arrive at your conclusions?

Same way as you did.
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Old 9th June 2012, 03:30 PM   #760
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Did you forget to read my post?

Then that and the other posts contradicts itself.
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