Duke, my understanding of an isobaric woofer is that BOTH woofers receive the same signal. In this case, the outer woofer is receiving a signal from the crossover, and the inner woofer is receiving a full range signal from the amplifier. All crossovers introduce phase issues, particularly a crossover as complex as this one. If there were ANY phase differences between the two drivers (in the same enclosure!) they would interact and produce peaks and dips in the frequency response.
I think that Acapella themselves have realized this, which is why there are notch filters built-in in the crossover.
If you want to see pictures of the dissected speaker, take a look here:
http://www.pbase.com/amfibius/things
One of the pictures shows the back of the woofer (notice the flimsy looking spider?) with what appears to be a model number - SEAS CA25ACA. There is also a picture of the front of the woofer. A google search fails to bring up the driver. A pity, I was hoping to find the T-S parameters.
Brian, thank you for your suggestion however I do not believe a replacement amplifier will solve the problem. A solid state amp will only improve the damping factor, and it looks as if Acapella have "set in wood" the problem with the bass.
Having said that, I can easily borrow some amps from my dealer and see whether 600W of solid state Class A/B would be enough to drive the speaker. I realize that an amp like this will probably ruin the top end, but it should immediately answer the question of whether it can make the woofers move.
In another thread, I asked you if the updates to the Mk.IV version of the Violon can be retrofitted to mine (Violon 2001). The answer you gave was "no". My option at present is to sell the speaker or to modify it.
I think that Acapella themselves have realized this, which is why there are notch filters built-in in the crossover.
If you want to see pictures of the dissected speaker, take a look here:
http://www.pbase.com/amfibius/things
One of the pictures shows the back of the woofer (notice the flimsy looking spider?) with what appears to be a model number - SEAS CA25ACA. There is also a picture of the front of the woofer. A google search fails to bring up the driver. A pity, I was hoping to find the T-S parameters.
Brian, thank you for your suggestion however I do not believe a replacement amplifier will solve the problem. A solid state amp will only improve the damping factor, and it looks as if Acapella have "set in wood" the problem with the bass.
Having said that, I can easily borrow some amps from my dealer and see whether 600W of solid state Class A/B would be enough to drive the speaker. I realize that an amp like this will probably ruin the top end, but it should immediately answer the question of whether it can make the woofers move.
In another thread, I asked you if the updates to the Mk.IV version of the Violon can be retrofitted to mine (Violon 2001). The answer you gave was "no". My option at present is to sell the speaker or to modify it.