Marshall SV20C with extension speaker impedance hookup to PS-2A

Stage & Studio Power Station PS-2
1

First post here, hello to all.
I have a Marshall SV20C which I’ve replaced the internal speaker which originally had an 16ohm impedance to a 8 ohm impedance. The reason being is that I also have an extension cabinet which runs an 8 ohm impedance. I want to use both of these speakers and want to verify my hookup to a PS2-A. On the back of the SV20, I usually connect to the 1X4 ohm/2X8 ohm jack.

  1. Do I still connect to this output jack?
  2. If I do I set the input on the PS2 to 2/4 switch?
  3. Output for each speaker switched to 2/4?

If not correct can you please suggest correct hookup? Thank you!

2

Hi @MarvoxPC and welcome to the forum,

OK so normally there is a cable connected to a “1x16 Ohm” socket for the internal speaker.

Now that you changed that to an 8 Ohm you are using the “1x8 Ohm” socket with the internal - sounds good too.

Now you want two 8 Ohms in parallel just use the 2 x 8 Ohm socket as you would expect, that is a 4 Ohm load. So here is what I would do:

  1. PS-2A AMPLIFIER IMPEDANCE 4 Ohms
  2. PS-2A SPEAKER IMPEDANCE 4 Ohms
  3. Marshall “1x4 Ohm” to PS-2A AMP IN
  4. PS-2A SPKR ONE to Internal Cab
  5. PS-2A SPKR TWO to External Cab

This is the back panel to give a bit of context:

image
image2008×1068 203 KB

I am assuming here there is no internal connection from amp to combo speaker, that the factory has the speaker connected to 1x16 Ohm?

1 Like
3

Hi Dan,
Thanks for the quick response and setup instructions!
There is no internal connection from amp to the combo speaker.

4

Ok then, that makes it normal, just like hooking up cabs. Good news.