stupid power amp question...

[khedspeth]

Looking at a power amp that has the following ratings...

200W/channel @8 ohms
830W @ 4 ohm bridged

If I have 8 ohm speakers, couldn't I just run the amp in bridged mode into my two 8 ohm cabs in parrell to get 415W/cabinet? Am I missing something?

Thanks for the enlightenment.

 

[BassmanPaul]

If the amp has the ratings you specify you would be safe to do as you suggest. The amp should also have a rating of 415W/channel into 2Ω.

Paul

 

[khedspeth]

Paul,

Thanks for the confirmation and you are correct on the 2 ohm rating.

Kevin

 

[Zooberwerx]

If you run your amp in bridged mono (830 watts @ 4 ohm) and daisy chain your two 8 ohm speaker cabs together, you'll be seeing a 4 ohm total speaker load and the full 830 watts from the power amp.

Riis

 

[khedspeth]

ok, sounds like i'm good to go. Here is the question that now comes up. The amp (QSC RMX850) is spec'd at 830W bridged into 4 ohms. However, on the back of the amp is says minimum load for bridged mono is 8 ohm. If I run inputs into both channels (stereo) but run the output bridged, will I be ok with a 4 ohm load?

 

[Zooberwerx]

ok, sounds like i'm good to go. Here is the question that now comes up. The amp (QSC RMX850) is spec'd at 830W bridged into 4 ohms. However, on the back of the amp is says minimum load for bridged mono is 8 ohm. If I run inputs into both channels (stereo) but run the output bridged, will I be ok with a 4 ohm load?

Hold on until we take a look at the manual.

Riis

 

[Zooberwerx]

Here's the manual. Print and read before continuing.

Link Removed

In bridged mono, you use only one input and one output (channel 1 Speakon or the two center binding posts). Can't find a reference on the min. 8 ohm bit but I just skimmed the text. You might want to ask Bob Lee here on TB for a quick, informative, and friendly answer.

BTW, this was not a stupid question. I'm using the RMX 1450 in bridged mono to drive two small subwoofer cabs (8 ohm each).

Riis

 

[khedspeth]

Riis,

Thanks for spending time on this and helping. I did read the manual and it clears things up alot. Love the support on TB.

Thanks,

Kevin

 

[Bob Lee (QSC)]

The RMX850 is okay bridged into a 4Ω load, as long as you are careful to avoid clipping, keep the cooling air flow unobstructed, etc.

 

[Zooberwerx]

The RMX850 is okay bridged into a 4Ω load, as long as you are careful to avoid clipping, keep the cooling air flow unobstructed, etc.

Thanks, Bob!

I'll take it one step further: the RMX850 will work but I would opt for something with a little more oooomph, given the stated application. I just snagged a PLX 3102 and have been more than satisfied.

Riis