Carver Sunfire True Subwoofer MK1 250V Modification

[Max Headroom]

A Carver Sunfire True Subwoofer MK1 came my way the other day, but is 110VAC rated and my local supply is typically 250VAC.
The Sunfire True Subwoofer Signature Owners Manual is the nearest that I can find (I don't know what the 'Signature' version difference is) and states 230VAC version.
Quick inspection reveals one small transformer (easy to replace) supplying 18VAC for the derived 13VDC supplies, and 200V rated main caps (easy to replace) for the HV supplies.

AFAIK the below schematic is representative.


Does anybody know the 120VAC vs 230VAC versions schematic differences please ?.

Dan.

 

[Max Headroom]

Bump....

 

[weltersys]

Bump....

MMMMax,

Can't offer you much circuit help, so I won't.

Rather than trying to modify the unit, I'd suggest a step down transformer.
The manual states it only uses "approximately 380 watts for most music on the loudest passages" so a 500 or 1000 watt unit for $39 or $74 should do.

I only heard a Starfire once last century (in a repair shop after repairs...), the LF output per size and weight was amazeballs at the time!

Cheers,
Art

 

[Max Headroom]

Thanks, but I prefer to avoid (purchasing) stepdown transformer.....I have suitable caps and 18V transformer in stock for free.
Evidently there are existing factory 230V versions, anybody have one ?.

Dan.

 

[Lunchietey]

I saw that sub for sale a while back. Avoided it for this very reason.

You'd need to find a suitable transformer etc to output the required voltages for the amp board.

Unless you know exactly what you are doing, it's a great way to burn your house down to save a few bucks