TS115A - what is cabinet volume, woofer impedance, and woofer sensitivity?

I'd like to replace my TS115A woofers with some woofers I have on hand which are much more expensive -- the JBL 2226H (there are others as well that might work nicely, but the JBL has smooth midrange response). Can anyone tell me what the cabinet internal volume is, so I can tune the ports appropriately? Also, just to make sure this will match up, what impedance is the TS115A's woofer? How about its sensitivity at 1 W/1m? I have technical skills and much experience with loudspeaker design, but it would be great to have more info.

Has anyone replaced/upgraded the TS115A woofer? What did you use and how did it work out?

I am sure Alto will not condone such shenanigans, but to me the TS115A is a good platform for tinkering...they don't sound too bad stock and the amp has good power.

Thanks for any help.
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  • Hello,

    Thanks for posting. 

    I'm afraid I don't have any information on the internal specifics of the TS115A, nor do we recommend modifying your speakers in any way, as this will void your warranty.
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  • Um, thanks...Not sure how cabinet volume would be any secret that might give competitors an advantage. It would help me design better and the fun I have would even contribute to brand loyalty. Also, these are long out of warranty, no risk there. I see that a guy named Phil has posted on upgrading the woofer (thanks for that!), and there are youtube videos also on this model. Of course, more money buys higher performance, which is what I want to explore, because I like the overall design very much, particularly the cabinet and amps. Also, if people hear the upgraded speaker at performances they might want an Alto. As a physicist and electrical engineer, it really irks me that lawyers write all the user manuals these days and fill them with nothing but irrelevant garbage. What paranoia... I can remember when audio equipment actually came with schematics! Why not follow JBL's successful example? They publish all kinds of detailed specs and design guides. For a professional use product, that is very helpful and it really gives the impression of a quality product that has nothing to fear. Anyway, I will be doing this anyway, albeit with whatever measurements I have to make, since I own the speakers now...regards
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