Adding a Passive Radiator to a Passive Canton Subwoofer Plus C ??

[Hi-Fi Luggage]

Hi all, I have a Canton Plus C passive subwoofer that I plan to make turn into an active sub using a 200 watt rms plate amplifier. The subwoofer will be used mostly for music in a 2.1 desktop computer setup in a medium sized room. I am looking for feedback if it would be wise to add (2) 12" passive radiators, or keep it sealed and lose some internal volume from the plate amplifier? The enclosure measures: Width 13.4 in, Depth 13.8 in, Height 14.2 in, wood thickness 3/4". The Canton subwoofer is DVC and rated at 70 watts continuous.

Here is the passive radiator I was planning to use: https://www.parts-express.com/dayton-audio-sd315-pr-12-designer-series-passive-radiator--295-496

 

[Verdinut]

Hi all, I have a Canton Plus C passive subwoofer that I plan to make turn into an active sub using a 200 watt rms plate amplifier. The subwoofer will be used mostly for music in a 2.1 desktop computer setup in a medium sized room. I am looking for feedback if it would be wise to add (2) 12" passive radiators, or keep it sealed and lose some internal volume from the plate amplifier? The enclosure measures: Width 13.4 in, Depth 13.8 in, Height 14.2 in, wood thickness 3/4". The Canton subwoofer is DVC and rated at 70 watts continuous.

Here is the passive radiator I was planning to use: https://www.parts-express.com/dayton-audio-sd315-pr-12-designer-series-passive-radiator--295-496

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Welcome to AH,

The use of passive radiators requires a bigger internal box volume nearly as big as that required with a vented box. In your case, you may as well forget that option for a desk top computer sub.
I wouldn't recommend installing a plate amp to your cabinet. This would reduce the internal volume of the box and also change the frequency response and performance of your sub. In addition, you could have some heat buildup in the cabinet which could shut off your amp if it has a thermal sensor protection.

Any woofer or subwoofer needs to be matched with a specific enclosure type and size for an optimum performance. This Canton sub was designed for use in a sealed box. I doubt it would perform well in a box with a passive radiator which operates similarly to a vented box.

 

[lovinthehd]

Just add an external amp then you don't need to mess with the box. You could get creative about placing the amp if desktop space is not available. Or is this an amp you already have and want to put to use or something?

 

[highfigh]

You would be far better off buying a driver, building a box and testing your ideas- why would you cannibalize this woofer, which isn't a cheap one?

You can't just take any woofer and slap a couple of passive radiators on the box and expect it to sound like anything but crap. It doesn't work that way.