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The speakers are 8 ohm (three 2 ohm in series in each cabinet).
You can connect them in parallel with others HOWEVER you cannot go below 4 ohms a side with your amp. This means you could use ONE other 8 ohm speaker in parallel with one of the passport speakers PER side.
Since the amp can vastly exceed the passport speaker rating you need to be careful to not overpower the passport speakers. One way to HELP regulate the level to the passport speakers is to use a LONG small gauge speaker cable on the passport speakers. Use a 50 foot 16 gauge speaker cable while using heavier, shorter cables on your mains.
With your Samson I would use mains rated at 300 Watts CONTINUOUS power, or at least maintain discipline in volume level to [revent speaker damage.
ALWAYS loop your speaker cables through handles of the enclosure to prevent them being pulled out during use which will destroy your amp... VERIFY the plugs are seated before pwering the system.
1st connect the digitech vogalist
(Line Out L/R) output to one (line input) from boss br 900 and the boss (line output) to the passport (stereo input) use a high quality cables, to supress noise efect, on output.
If there is a 120hz buzz then there is a ground loop between the computer and the passport. You need to get a ground isolator to go between the two. If the buzz is deeper the may be a audio ground off or the hum is comming from the power supply
The manual is here if you don't have one:http://www.fender.com/support/manuals/pdfs/manuals_elec/fenderaudio/PassportP250.pdf Have a look at page 9 and read the VIP Channel 1 only section. It will explain the solution to your problem and the settings to overcome it. Please let me know if this helps.
There are screws running down the sides of the front panel which you will have to remove. The circuit board is secured to the front panel by the nuts, washers etc. that the controls and jacks are fastened with. Once you get the panel; loose gently move it forward so you can see any connections to the circuit board. Make careful note of all of these and draw diagrams. You will have to completely remove the panel from the enclosure and then the circuit board from the panel. The jack in question will be mounted on the circuit board and soldered to it on the reverse side. You will need to unsolder it, obtain an exact replacement, solder in the replacement and replace the board on the panel and the panel back in the enclosure. Make sure everything is connected exactly the way it was originally. Hope this helps.
I have one that is doing the exact same thing. It's at a Fender Authorized Service Center now. Hopefully dude can find the problem. Fender says there is a 5 year warranty on it, so I expect them to make good on their promise. Did you get yours fixed?
Sorry about the delayed response, I just noticed this posting.
The protect indicates a problem with the output section of the amplifier. Effectively the amp has been shutdown to prevent further damage. Although the unit should not have been working (at least not well) at 30V, unless they htried to run it at full volume, there should not have been damage. The outputs are blown and this unit requires repair. If I remember these units correctly, there are 8 output transistors, most of which may require changing. WIthout seeing the unit and taking some measurements, I can not say for sure, but expect $40-$70 in parts.