L4780 bridged or parallel into 8Ω sub, use L + R signals? - diyAudio
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Old 20th April 2012, 07:37 AM   #1
ZLyzen is offline ZLyzen  United States
diyAudio Member
Join Date: Dec 2011
Location: Ann Arbor
Default L4780 bridged or parallel into 8Ω sub, use L + R signals?

I've done some reading about this but nothing really matched up to my situation

I will be running a l4780 in either a bridged or parallel configuration for a 8Ω sub. It takes 80wrms/160wpeak

Anyways, if my toroid is good on voltage should I be running this bridged to benefit from the current? wouldn't this then treat my 8Ω like a 4Ω?

also, can the inputs (since there are 2) be the left and the right so they are summed for the mono subwoofer? Is this common practice?
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Old 20th April 2012, 08:02 AM   #2
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Join Date: Feb 2008
Location: Jackson,michigan
If you run it bridged each amp section will see a 4ohm load.
If you run it in a paralleled configuration then each amp section effectively see it as a16 ohm load.
Depending on what your power supply voltage is will determine which configuration will work best for and what power levels you are trying to reach.

So more information is required to determine as to what you need, namely what is the power supply voltage that you are planning on using.
And the type configuration that you are planning.

It is sometims practiced to sum the two channels together for sub signals, But should only be done in the preamp stage if you are using a bridged configuration as would be done if using a single amp.


Last edited by geraldfryjr; 20th April 2012 at 08:08 AM.
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