MP3Car.com - View Single Post - On a 2 channel amp that I plan on bridging, do I need BOTH rca ins?

ZtH01 · 10-14-2006, 12:14 AM

Quote: Originally Posted by FyreDaug

I asked because I wanted to know if you NEEDED them, and then I posted what I was trying to do. I thought you read that, and asked again, then I re-explained and you read it again.

How would it be 1/4 of 220w, when it runs at 220w when its bridged at 4ohm. The other input is just a signal, if its not getting another signal it wont add it to the merged wave. All it does when you bridge is take the 2 signals, add the waves together and then send it to the speaker. If its only using 1 signal, it will be quieter, but its not gonan cut power. It should have about 5-6vrms from the line driver. Which is more than it was getting from the deck it was hooked up, when it was 2.5v per channel. Adding them together will increasre the chance of it distorting because its adding 2 things together. It will also be a cleaner sound instead of getting left/right and mixxing it.

I dont see how im missing something here, and you dont need to be a dick

I'm not being a dick. I'm being honest. If all other things are equal, the quieter setup has less power. It's that simple. You are not getting the full 220 watts from the amp, if you only have one input hooked up. I have my Rockford Fosgate P4002 bridged. Birthsheet says it does 175x2 at 4 ohms. This is about 700 watts or so @ 4ohm mono. When I unplug an RCA and it gets quieter, it is no longer putting out 700 watts. I reckon it drops it 25%. Maybe only 50%, but it gets very quiet.

The second input is not just added to the wave. If properly bridged, the other channel is actually 180 degrees out of phase. This channel becomes the new ground, or negative output. This allows twice the voltage to swing, or 4 times the power output, assuming the amps power supply isn't crap.

10-14-2006, 12:14 AM	#49
ZtH01 Constant Bitrate Join Date: Jan 2006 Location: Mankato, MN Posts: 116	Quote: Originally Posted by FyreDaug I asked because I wanted to know if you NEEDED them, and then I posted what I was trying to do. I thought you read that, and asked again, then I re-explained and you read it again. How would it be 1/4 of 220w, when it runs at 220w when its bridged at 4ohm. The other input is just a signal, if its not getting another signal it wont add it to the merged wave. All it does when you bridge is take the 2 signals, add the waves together and then send it to the speaker. If its only using 1 signal, it will be quieter, but its not gonan cut power. It should have about 5-6vrms from the line driver. Which is more than it was getting from the deck it was hooked up, when it was 2.5v per channel. Adding them together will increasre the chance of it distorting because its adding 2 things together. It will also be a cleaner sound instead of getting left/right and mixxing it. I dont see how im missing something here, and you dont need to be a dick I'm not being a dick. I'm being honest. If all other things are equal, the quieter setup has less power. It's that simple. You are not getting the full 220 watts from the amp, if you only have one input hooked up. I have my Rockford Fosgate P4002 bridged. Birthsheet says it does 175x2 at 4 ohms. This is about 700 watts or so @ 4ohm mono. When I unplug an RCA and it gets quieter, it is no longer putting out 700 watts. I reckon it drops it 25%. Maybe only 50%, but it gets very quiet. The second input is not just added to the wave. If properly bridged, the other channel is actually 180 degrees out of phase. This channel becomes the new ground, or negative output. This allows twice the voltage to swing, or 4 times the power output, assuming the amps power supply isn't crap. __________________ -ZtH01 "It's my belief that my big balls should be held every night"