Which is louder Bi-amped 205watts or [email protected]?

A watt is a watt . . . . the impedance (ohm rating) simply determines how much an amp can give a cabinet, but does not have any effect on volume. IE 200 watts into a 2 ohm load, a 4 ohm load or an 8 ohm load will have the same exact output, assuming identical cabinets and drivers with the same efficiency.
But remember, that doubling the power will only give you 3db more. so while the the biiger head may give more level, you will also be exceeding the ratings of your cabs if you push it, and may well get into power compression, and see no noticeable gain in level. (I am assuming that you would run the B4r bridged into 4 ohms for 1000 watts out, vs, the 450 of the B2re.)

- Tim

 

205 @ 8 x 2 is 410 @8 and would be perhaps 2dB louder than [email protected] That 2dB would be about the equivalent of turning up the volume from 7 to 8. But by running a 1x15 and a 2x10 off the same amp channel you're wasting half the power going to the 1x15 with highs it can't use and half the power going to the 2x10 with lows they can't use. Get the dual channel amp but only if it has a crossover so that each of your cab can be efficiently driven.

 

I had that setup at one time. It sounded great! My 50 year old back just couldn't handle it anymore. If you run the B4r bridged into both cabs. 500 watts into each cab, you will never again feel like you are lacking headroom. IMO the better rig was the B4r bridged into a 610hlf. But since you already have the 410/15 setup, I'd say go for it.

 

No. If you do so you're only a bit over 3db better off than now. You're wasting at least that much by running both cabs together. You'll get at least 6dB more if each power amp drives its own speaker and a crossover is employed so that each speaker is actually able to use all the power going into it.

 

There you go. The B4r is capable of doing both since it has a built in crossover. That way you can try it out both ways and see which you like best. I did when I owned mine and decided on bridged full range through both cabs.
You may decide differently as billfitzmaurice did.

 

If that's the case you can't lose, you've got the option of going either way.