I have a 110v power input Paradigm PDR10 and would like to convert it to 220/240. I'm sure it's a case of change the series connection to parallel on the transfomrer but I'm not sure the exact functions of the board connection, wiring diagram needed

Here's the Owner's manual -> https://docs.google.com/viewer?url=https%3A%2F%2Fwww.paradigm.com%2Fdownloads%2FOM-100.pdf.
There are many ways to connect the system depending on your receiver's outputs and the speakers. Usually, the TV L/R output connects to one of the receiver's inputs. The receiver's preamp sub output goes to the powered subwoofer. The receiver's FL/C/FR/SL/SR/RL/RR speaker outputs go to the respective speakers.

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PS-1200 Specifications
Design
Single driver, DCBS™ system with high velocity resistive ports and built-in amplifier Amplifier High current, hybrid output, 130 watts RMS
Amplifier Features Powersaver auto-on/off, soft clipping, thermal protection Low Pass Filter Frequency Variable 50Hz-150Hz Low Frequency Driver 310 mm, carbon-fiber-reinforced composite cone, Apical™ former Low Frequency Extension 23 Hz (DIN) Sub / Sat Phase Alignment 0 - 180 Finishes Black Ash Inputs From A/V receiver/processor or Paradigm X-Series Control Unit or preamp left/right output; From receiver/amplifier speaker terminals or main/satellite speaker terminals Weight 68 lbs. (31 kg) Dimensions HxWxD 19.75" × 17" × 21"
(50cm × 43cm × 53cm)
Specifications are subject to change without notice.

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PDR-8 Specifications
Design
Single driver, bass reflex system with critically tuned resistive port and built-in amplifier Amplifier High-current, discrete output, 90 watts RMS
Amplifier Features Soft clipping, thermal protection Frequency Response On-Axis 29Hz - 150Hz Low Frequency Driver 210mm (8 in) extended travel with 38mm (1-1/2 in) voice-coil, aluminum former Low Frequency Extension 29 Hz (DIN) Finishes Black Ash, Light Cherry, Dark Cherry Inputs From A/V receiver/processor or Paradigm X-Series Subwoofer Control Unit mono-sub out or preamp left/right output;From receiver/amplifier speaker terminals or main/satellite speaker terminals Weight 25 lbs. (11 kg) Dimensions HxWxD 13.25" × 9.75" × 15"
(34cm × 25cm × 38cm)
Specifications are subject to change without notice.

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It is not feasible to convert it internally.

What you may need is a

Voltage converter ' Voltage Transformer ' step up and step down ...

Connect the 220V line output to EP2500

And the 110V input to your 110V convenient outlet

hi,
You have to check the working voltage of the adapter of you device. If it purchased from US then it will be 110V. I think the Line voltage in Australia is 220V.Also You have to check is there is any input voltage selector in the in its adaptor . If it there you have to change it to 220V. If there is no such selector then you have to buy a 220v to 110v converter .Then connect the out put of that converter to to your device. You can by this converter at any electronic spare part shope near to you. Or you have to by a new 9V 1.3Amps AC adaptor. When you going to by the converter or a new adaptor take the device. If so they will explain you how to connect the converter or adaptor . By changing a fuse you can't change the operating voltage. If The adapter is designed to use in 110V then the fuse will blow. If you change the fuse and make more experiment with it it will make the full system useless.
ok

Specs for this router says it draws 15 amps .
15 amps X 110v =1650 watts

I doubt that converter would last very long before going up in smoke

i guess ur talking about four nos of  4ohms 10" speakers. two speakers of four ohms connected in series gives 8 ohms, but if u use parallel connection u will get half of individual ohms i.e 2 ohms. so connect two speakers in series and another two speakers in series. parallel the two serial speakers and voila... u get a 4ohms speaker with double the wattage.
parallel connection - connect +ve to +ve and -ve to -ve.
series connection - connect -ve of one speaker to +ve of another speaker so that u have +ve input to one speaker and ground(-ve) on the second speaker.
So, two separate series speaker then parallel the two series speakers.

Don't bother. A subwoofer will only reproduce the rumble (deep bass) end of the spectrum. You would still need other (full range) speakers for the rest of the frequencies.

But, if you must - get an adapter to convert the Ipod's headphone output to an RCA pair and jack it into the sub's inputs.

Many manufacturers design equipment with varying voltages in mind, and may list an ability to handle input ranging from 110-240 volts, indicating that it will work in Europe and the United States. In addition, the equipment is usually rated at 50/60 hertz, and will function on either cycle. However, some devices, especially hair dryers, are designed to function at either 110/60 or 220/50. If this is the case, a voltage converter is necessary.
If this is the case, look at the wattage requirement of the device, which should also be listed. When buying a voltage converter, be certain to get one with a wattage which has a higher rating than the device you are plugging in, to prevent electrical malfunction. Some electronics also require more energy at start up than in a running or standby mode, and if this is the case the wattage rating of the voltage converter should account for 120% or more of the listed wattage need of the device....Setanta