Duke, the woofers are NOT in isobaric configuration. Isobaric (as I understand it) means: two woofers, fed the same signal and wired in parallel, located very close together. At bass frequencies, the distance between the two woofers is much less than a bass wavelength - meaning no standing waves.
The woofers are about 50cm apart, with the lower woofer firing into an enclosure which is stuffed full of ... umm, stuffing. My friend (who is a speaker engineer) commented that placing them 50cm apart and running up to 450Hz between them would surely cause standing waves. I mean - the wavelength of a 450Hz wave is 76cm. You only need 1/2 a wavelength to set up a standing wave. I calculate that standing waves between 343Hz to the crossover point could potentially be supported.
He also commented that the intention of the stuffing (for want of a better word) may be for acoustic filtering. The High Suboktav is marketed as having an additional woofer allowing for deeper extension. Perhaps this was the intention.
I was unable to find the SEAS CA25ACA by google search, so I can not tell you what the T-S parameters are. However, there are some other SEAS drivers which are almost similar so the T-S parameters are probably very close.
My friend noted that the cone suspension is not very rigid, and it is very easy to make it reach maximum excursion (Xmax).
I am starting to wonder if the non-Suboktav version of the Violon may have cleaner bass. What do you think, Brian? Thank you for your suggestion of trying different amplifiers, but like I said - if the problem has been "set in wood" then it won't go away no matter how many Watts I feed it.
And BTW I am not too worried about resale value. I am a very slow upgrader and I tend to hang on to my goodies until they die. I have NO INTENTION of selling this speaker, because the mids and the top end are sensational. If I could fix the weakness, I would be very happy.
The woofers are about 50cm apart, with the lower woofer firing into an enclosure which is stuffed full of ... umm, stuffing. My friend (who is a speaker engineer) commented that placing them 50cm apart and running up to 450Hz between them would surely cause standing waves. I mean - the wavelength of a 450Hz wave is 76cm. You only need 1/2 a wavelength to set up a standing wave. I calculate that standing waves between 343Hz to the crossover point could potentially be supported.
He also commented that the intention of the stuffing (for want of a better word) may be for acoustic filtering. The High Suboktav is marketed as having an additional woofer allowing for deeper extension. Perhaps this was the intention.
I was unable to find the SEAS CA25ACA by google search, so I can not tell you what the T-S parameters are. However, there are some other SEAS drivers which are almost similar so the T-S parameters are probably very close.
My friend noted that the cone suspension is not very rigid, and it is very easy to make it reach maximum excursion (Xmax).
I am starting to wonder if the non-Suboktav version of the Violon may have cleaner bass. What do you think, Brian? Thank you for your suggestion of trying different amplifiers, but like I said - if the problem has been "set in wood" then it won't go away no matter how many Watts I feed it.
And BTW I am not too worried about resale value. I am a very slow upgrader and I tend to hang on to my goodies until they die. I have NO INTENTION of selling this speaker, because the mids and the top end are sensational. If I could fix the weakness, I would be very happy.