I just got lost with all that 3way 4way big ball small ball discussion. Seems pretty high for near field.
I whould prefer less then 200Hz too but there is a serious baffle step and loss of level in the lower reaches of the midrange.
I was gonna say something earlier about step loss from mounting your mid in a "low diffraction" baffle but I figured you'd considered that already. That's one reason I figured a TL alignment could help. Realistically, you're going to lose a fair amount of sensitivity unless you cross over higher and beef up the lower end with a high sensitivity woofer or combination of woofers. Asking your mid to deal with heavy step loss might be a bit much, no?
Well, i have build one bass cabinet but because of the erthquacke in Japan ( i have a lot of friends there ) and my family lying down with the flue i have not asembled it yet.
Looks good though, very compact and rigid. I will send some pictures soon.
Looks good though, very compact and rigid. I will send some pictures soon.
I also have an idea how to solve the baffle step. Two midranges can be used and one of them crossed over low so that in the fundamental tone area both work and one gets decoupled higher up.
What i will use is an oversized 6 Liter sphere. It baffles the tweeter optimally. Doing that i will get a very low Q on the midrange what will create a loss of deeper frequencies also.
Could be compensated with the crossover so this is a balancing act. i whould prefer only one midrange too.
Could be compensated with the crossover so this is a balancing act. i whould prefer only one midrange too.
Hello Joachim,
The seismic event in Japan is of epic proportion, the destruction to lives and property is devastating. My day job is designing and inspecting mechanical systems for California hospitals and other public buildings. 9.0 is beyond my comprehension. My heart goes out to the people of Japan.
No hurry for the photographs
DT
All just for fun!
The seismic event in Japan is of epic proportion, the destruction to lives and property is devastating. My day job is designing and inspecting mechanical systems for California hospitals and other public buildings. 9.0 is beyond my comprehension. My heart goes out to the people of Japan.
No hurry for the photographs
DT
All just for fun!
My friends in Tokio are safe at the moment. It´s hard to get reliable information from other parts of the country. Anyway i think there was a lounge opened at DIY audio where this issue can be discussed.
I'd be interested in seeing measurements of the midrange alone vs. measured when positioned above the woofer and box.
Dave
I will do that of cause. I hope it effects only the deeper regions where it does not do much harm.
Hello,
The fishing floats could hang from the ceiling in fish nets. Kind of a nautical theme.
Or the balls could also serve as lamp bases sitting on woofer boxes that are also coffee tables.
DT
All just for fun!
Today i finished one Isobaric Woofer. I am happy to report that i did not run into unexpected problems. No combfiltering, no wrincles in the impedance curve even without any obstacles or damping material between the woofers. I made sure that the cabinet is airtight. I used butyl rubber strips from Mundorf. The cabinet has a stiffening cross and the internal woofer is pressed against this cross with a piece of chipboard and stiff paper.
The frequency response is rather flat untill 1kHz, much more then i need. Even a two way whould be posible with a tweeter that goes down deep enough. Ots is a bit high at 0.9 but the woofers have not being run in. I do that over night and measure again tomorrow. In room i can hear decent ouput from 32 Hz on and that is fine considering the rather small cabinet. I did a sweep from 12 to 300Hz and could not hear any rattling or such that comes directly from the Isobaric. The room resonance of my lab at 79Hz and some stuff rattling in the room was much louder then what comes from the woofer so i expect a rather clean sound.
The frequency response is rather flat untill 1kHz, much more then i need. Even a two way whould be posible with a tweeter that goes down deep enough. Ots is a bit high at 0.9 but the woofers have not being run in. I do that over night and measure again tomorrow. In room i can hear decent ouput from 32 Hz on and that is fine considering the rather small cabinet. I did a sweep from 12 to 300Hz and could not hear any rattling or such that comes directly from the Isobaric. The room resonance of my lab at 79Hz and some stuff rattling in the room was much louder then what comes from the woofer so i expect a rather clean sound.
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