Real Basic Question about watts..

[ping23]

If each cab is rated at 8 and my head is 4 I should be fine.

[Vince Klortho]

If the cabinet you add can handle 150W then, yes, you should be fine. Just be sure to let your ears be the judge.

[Cadfael]

Originally Posted by BassmanPaul

this is a complete myth. The size of the cone is irrelevant to the lows it will produce.

Adding a 2x10 could work BUT it MUST be twice the impedance of the 4x10. This will balance out the power to each driver. So 8Ω 4x10 needs a 16Ω 2x10. 4Ω 4x10 needs an 8Ω 2x10 and your amp will have to be 2Ω stable.

I agree with the first statement!

But a 210 which works together with a 410 can have both - 8 or 16 Ohms. Okay; in an 8 Ohms cab the 210 speakers have to work "twice as hard" as the 410 speakers (or the 210 in a 16 Ohms cab). But that's no problem. Remember that the Backline 600 "only" gives 150 watts per cab.

For a 16 Ohms cab ...
The total impedance of a 8 Ohms 410 plus 16 Ohms 210 is 5.333 Ohms.
A 300w @ 4 Ohms would give about 270 watts max. (to make it easy) ...

This means that the 8 Ohms gets 2/3 and the 16 Ohms 1/3 (because of the higher impedance).
So, the 410 gets 180 watts, the 210 gets 90 watts - each 10" speaker 45 watts.

That's nice - but not neccessary ...

[RickenBoogie]

Of course a 410 and 210 can work, it's the problem that now your entire rig is limited by the output of the 210, rather than the combination of the 2 cabs. This makes the 410 alot of "dead weight", since it will never be pushed very hard, and all the while, the 210 is getting slammed.

[Bass_Pounder]

Originally Posted by Cadfael

I agree with the first statement!

But a 210 which works together with a 410 can have both - 8 or 16 Ohms. Okay; in an 8 Ohms cab the 210 speakers have to work "twice as hard" as the 410 speakers (or the 210 in a 16 Ohms cab). But that's no problem. Remember that the Backline 600 "only" gives 150 watts per cab.

For a 16 Ohms cab ...
The total impedance of a 8 Ohms 410 plus 16 Ohms 210 is 5.333 Ohms.
A 300w @ 4 Ohms would give about 270 watts max. (to make it easy) ...

This means that the 8 Ohms gets 2/3 and the 16 Ohms 1/3 (because of the higher impedance).
So, the 410 gets 180 watts, the 210 gets 90 watts - each 10" speaker 45 watts.

That's nice - but not neccessary ...

Maybe now it's not necessary because of the amp he has. How about when he wants to upgrade to a more powerful amp ?

Instead of just getting a new head, he would then also have to replace cabs.

[ping23]

Well i got a 300w 4ohm head with two 4x10 400w 8ohm/each cab. I play pop punk/alt rock/Emo music and use a peavey grind bxp 4nt.