RTiA9 Enclosure volume?

teamjhertz

I ran across a freight damaged RTia9 speaker and salvaged all the parts except for the cabinet. I am looking at making my own enclosure. I was able to find out the enclosure volume for the small sealed section of the enclosure that houses the mids and tweeter.
However i cannot find or calculate the volume for the balance of the enclosure due to the curved design. I want to maintain the same tuning as the stock enclosure. Does anyone know what the volume is for the air space the three woofer utilize?

Upstatemax

Have you spoken to Polk about purchasing a new cabinet? I'm pretty sure they sell them.

teamjhertz

I am actually going to attempt to rearrange the drivers to make a custom center channel. I did get a quote for a new cabinet before i found a good deal on a third RtiA9. Thanks for the response

teamjhertz

Do you think it would be safe to use the volume from a RTi12? This would be easier to calculate since there is no curve.

[Deleted User]

Hello,
I honestly don't believe the moderate curvature of the RTiA9 is going to effect the internal volume enough to change the loading characteristics. Take the outside dimensions, reduce them by the thickness of all the cabinet sides, top, bottom, front and back subtract the already known area of the sub-enclosure (add the thickness of the material used on the sub-enclosure) and you will be fine.
Since this to be a center channel speaker whatever slight detuning due to enclosure volume differences will effect the resonant frequency which won't be a problem with the frequency ranges covered by the center channel. Also, are you using the power port from the RTi12?
Regards, Ken

teamjhertz

Ken,

That makes a lot of sense. All parts that will be used are from the RTiA9.

Jack