# Question about daisy chaining cabs...

Discussion in 'Amps and Cabs [BG]' started by McHack, Jan 3, 2006.

1. ### McHack

Jul 29, 2003
Central Ohio!
This is a stupid question, & I should already know the answer... But, i'm I cant remember the net effect on impedence, when adding cabs to a given line.

I ask, because I've got a Crown XLS 402... For those not familiar with the model, here's the basic power output specs...

2ohm (per channel) 570W
4ohm (per channel) 400W
8ohm (per channel) 260W

8ohm (mono bridged) 800W
4ohm (mono bridged) 1140W

I bought this power amp, w/ the mindset, that I'd simply run 2 4ohm cabs, one per channel.

But, I am wonder what happens to impedence, if you daisy chain two 4 ohm cabs, running in bridged mode...

2. ### cheezewizSupporting Member

Mar 27, 2002
Ohio

I could very well be wrong, but I believe running two 4 ohm cabs chained together would give you a 2 ohm load, which apparently your amp won't do bridged, so that's a no no.

3. ### ThorModeratorStaff MemberGold Supporting Member

Seconded.

based on the specs is 4 ohms.

Code:
```
1
----
(1/R1 + 1/R2 + ... 1/Rn)

or in this example

1                 1
----         =  ---- = 2 Ohms
(1/4+1/4)        1/2

```

4. ### Jeff A

Oct 22, 2005
CT
Thirded

In other words, it is the reciprocal of the sum of the reciprocals. This applies to parallel circuits only.
1/R(total) = 1/R1 + 1/R2 + 1/R3

In a series circuit, resistance is simply additive.
R(total) = R1 + R2 + R3 + ...

So yes, you will need to run it in the two channel mode and settle for just 400 watts per side.