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Old 17th November 2008, 07:55 AM   #1
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Question subwoofer amplifier

hi guys,
i have a problem - i would like to build a normal 50W amplifier...

i have normal "small" bookshelf speakers and an amplifier for them.... i would like to drive this subwoofer amplifier from the output of my main amplifier and not from the input of my main amplifier - so the question is - how you can make a normal amplifier tht can deal with the input signal level of the normal main amplifier .... if you know what i mean.......????

i do not know how o they do it usually.....



thanks in advance....
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Old 17th November 2008, 08:01 AM   #2
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Quote:
how you can make a normal amplifier tht can deal with the input signal level of the normal main amplifier .... if you know what i mean.......????
They do it on plate amps all the time , just a resistor network
to divide the first amps output down to input level for
the second amp..

Search for a generic plate amp schematic , look at input
section.
OS
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Old 17th November 2008, 08:16 AM   #3
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ohhh - i thought that they use something more clever than this.... if it is a resistor network only that it is o.k. - no problem - that is easy to do....
thanks for the tip....
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Old 17th November 2008, 08:23 AM   #4
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Also make values low enough to at least present a small load to
the first amp.
Click the image to open in full size.

that one is for a 50w amp, I would add a higher wattage
50ohm resistor at the input.
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Old 17th November 2008, 08:29 AM   #5
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i saw in one jbl amplifier few minutes ago values like 240k and 4k7......
anyway - your idea is sounding better to me .... bu i would like to go with higher values - at least to have 25kohm if possible.... not just 11kohm in total..... just a bit higher
what do you think - would that be still o.k.????? for example 22k and 2k2......
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Old 17th November 2008, 09:17 AM   #6
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Some amps get a little "squirrely" when they see no load at
all ,look at many designs before you make a determination.
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Old 17th November 2008, 06:22 PM   #7
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o.k. - thanks .... i know what to do now
best regards
sunny
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