kiwifi
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I like push-pull subs, but I was unaware that Sony had made any, until I noticed one for sale on a local auction site.




In fact Sony has made two models that I know of. A dual 10" 250W sub (SA-WX700) and the one that I found, which is a dual 12" sub with a 1000W B&O IcePower 1000A amplifier inside! It appears that Sony produced these subs for a few years in the early 2000's, and although they were basically ignored by the hifi press, the user reviews that I found were largely positive. The only problem that I read about, was that the smaller SA-WX700 had a tendency to fry its power supply after a year or so.
Unusually, the lower (inverted) driver is pushed up inside the cabinet using a cast housing. This eats up a lot of the internal volume.






What amazed me was the components that make up the SA-WX900.
The Nichicon made power supply has a 12A line input fuse which at 240VAC implies 2880W of capacity




The regulated SMPS feeds 120V to an IcePower 1000A module rated at 1000W RMS @ 4 ohms 0.04% THD+N

All of which make me wonder why Sony chose to label the power consumption at 220W. Did they leave off a zero?

The two drivers have cast aluminium baskets and huge magnets, weighing in at 21lbs (9.54kg) each. The cones are made of Rohacell






Here are the measured TS parameters for the Sony drivers (Part # 1-825-374-11)


As you can see, their measurements are very close to each other

Where Sony appears to have dropped the ball is in the construction of the cabinet. Apart from the MDF front baffle and the lower board that connects the four feet, the cabinet is made of 25mm chipboard without any internal bracing or sound deadening material. The only concession are the small pieces of rubber, stapled and glued to the middle of three of the sides.







In fact Sony has made two models that I know of. A dual 10" 250W sub (SA-WX700) and the one that I found, which is a dual 12" sub with a 1000W B&O IcePower 1000A amplifier inside! It appears that Sony produced these subs for a few years in the early 2000's, and although they were basically ignored by the hifi press, the user reviews that I found were largely positive. The only problem that I read about, was that the smaller SA-WX700 had a tendency to fry its power supply after a year or so.
Unusually, the lower (inverted) driver is pushed up inside the cabinet using a cast housing. This eats up a lot of the internal volume.






What amazed me was the components that make up the SA-WX900.
The Nichicon made power supply has a 12A line input fuse which at 240VAC implies 2880W of capacity




The regulated SMPS feeds 120V to an IcePower 1000A module rated at 1000W RMS @ 4 ohms 0.04% THD+N

All of which make me wonder why Sony chose to label the power consumption at 220W. Did they leave off a zero?

The two drivers have cast aluminium baskets and huge magnets, weighing in at 21lbs (9.54kg) each. The cones are made of Rohacell






Here are the measured TS parameters for the Sony drivers (Part # 1-825-374-11)


As you can see, their measurements are very close to each other

Where Sony appears to have dropped the ball is in the construction of the cabinet. Apart from the MDF front baffle and the lower board that connects the four feet, the cabinet is made of 25mm chipboard without any internal bracing or sound deadening material. The only concession are the small pieces of rubber, stapled and glued to the middle of three of the sides.


