bridged and dmm???

[Lets Get It 10+ year member]

Say you have an amp that does 50w x 4 @ 4 ohms. you would set the dmm to 14.14 (the square root of 50x4), rite?

but if you bridge the amp to 2 channels and say it does 120w x 2 @ 4 ohms, would you set the gains for the 120w or keep it at the 50w?

This is not a real amp just tryin to figure this out!!

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[ChedNompton 10+ year member]

Say you have an amp that does 50w x 4 @ 4 ohms. you would set the dmm to 14.14 (the square root of 50x4), rite?but if you bridge the amp to 2 channels and say it does 120w x 2 @ 4 ohms, would you set the gains for the 120w or keep it at the 50w?

This is not a real amp just tryin to figure this out!!

All you do to set the gains when bridged is the same as if is it wasn't. All bridging does is strap the 2 channels to make 1. Say you have a 4 ohm speaker plugged in, each channel is seeing a 2 ohm load. So pretty much set the gains for 11 volts (in this situation). Good luck.

Larson

 

[Lets Get It 10+ year member]

but wouldnt i do square root of (120 x 4) to get 21.9

 

[ChedNompton 10+ year member]

but wouldnt i do square root of (120 x 4) to get 21.9

The number you got: 11 + 11 = 22 (close enough to 21.9) all you did is just factor in both channels. I'd suggest going to http://www.bcae1.com and reading about bridgeable amplifiers, here is a little snippet:

Amplifier bridging is simply using 2 channels of an amplifier to drive a common load. For 2 channel amplifiers, one left signal and one right signal is used to drive a mono speaker load. Keep in mind that mono and bridging are not necessarily the same. Mono means that there's only one output signal. There could be more than one speaker but each speaker will have the same output. Bridging means that you are using more than one source of power to drive a load (speaker). The sources of power are one each output from either channel of the amplifier. A long time ago, amplifiers had signal on the positive output speaker terminals only. To bridge one of those amplifiers, you'd have to use some means to invert the signal on one channel (remember the old 'bridging modules' for Orion amplifiers?). Today's bridgeable amplifiers have an inverted channel as part of their design. For many amplifiers, the left positive and right negative are are the signal outputs. A few use the left negative and the right positive. Others still (mostly mono amplifiers that are to be used in bridged pairs) require that you choose 0° or 180° via a switch to invert the signal.

So that being said, just set the gains using the 2 ohm load. Good luck.

Larson

 

[Symon_say 10+ year member]

but wouldnt i do square root of (120 x 4) to get 21.9

you're right, that's the number you have to find. It's the same cause 1ch = 1ch, and 2 ch bri = 1ch.