Thawach , what is that animated gif file (ImageShack® - Online Photo and Video Hosting) supposed to be telling me?
"preferrably 30-35 for a good DJ bin"
My measurements have shown me the peak output in commercial recorded dance music is around 55hz, with less than 1% of popular dance music having any real energy below 40hz. Never the less, I haul around (big) cabinets that are -3dB at 29hz.
http://i56.photobucket.com/albums/g196/dkleitsch/CoePA-2009.jpg
http://i56.photobucket.com/albums/g196/dkleitsch/Eminence151269.gif
"preferrably 30-35 for a good DJ bin"
My measurements have shown me the peak output in commercial recorded dance music is around 55hz, with less than 1% of popular dance music having any real energy below 40hz. Never the less, I haul around (big) cabinets that are -3dB at 29hz.
http://i56.photobucket.com/albums/g196/dkleitsch/CoePA-2009.jpg
http://i56.photobucket.com/albums/g196/dkleitsch/Eminence151269.gif
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djk i only try to simulation with the HR. my friends still never build now. when i saw the pics from n audio and technasound in thailand built it and sold many years ago. they told that it's very loud when outdoor .i thought that it's possible that i would do it with HR. here are the pics that they built and used the outdoor. djk if u have any advice please tell me.Technasound
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and these the turbo i think i'll use the HR to simulate when i have a free time.
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Do you have a parametric EQ or HPF?
It's not quite like you think, with mutual coupling the tuning is lower and driver excursion is at the limit. Running EQ @ 40 Hz would get him into trouble. The origional is at 40Hz and should be just fine.
What are the dimensions of your manifold and width of port?
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Until you learn to draw I think you will have difficulty with simulation due to lack of accurate information, I recommend you watch the Google SketchUp training videos to learn SketchUp. Also see http://forums.sketchucation.com/ forums.
I trust BassBox Pro v6.0 for sealed, reflex, and BP4 enclosures. I'm not sure about BP6, it's very different than v5.0
I'm estimating 150hz cavity resonance bassed on known speakers.
"Running EQ @ 40 Hz would get him into trouble. "
how much boost do you think a Q=1 is anyway? Boost at Fb does not eat up x-max at Fb.
"What are the dimensions of your manifold and width of port? "
Details are in the BB6 screen capture, showing Vb, Fb, Faux, port size, the whole ball of wax.
I'm estimating 150hz cavity resonance bassed on known speakers.
"Running EQ @ 40 Hz would get him into trouble. "
how much boost do you think a Q=1 is anyway? Boost at Fb does not eat up x-max at Fb.
"What are the dimensions of your manifold and width of port? "
Details are in the BB6 screen capture, showing Vb, Fb, Faux, port size, the whole ball of wax.
Hey yea that's great I too have been using BB since it came on floppys. Obviously this is an HR model I'm working on here.
So the model indicates a lower tuning and you want to run a slight boost say ~1.25db, no big deal if He has the MIC2200 but He does not and ye old GEQ will be a little wider Q than optimun and touchy to boot. Ever ask anyone to boost just ~1dB with a GEQ - LOL right
Besides the whole lower tuning just nets a loss above 40Hz anyhow so why bother?I've had your box drawn up since yesterday and I see no manifold dimensions in your BB screen capture. The port width did reverse calc at 2.75" wide, but the pics look wider than that. Also the drivers in the pic are clearly not the Martin 1844's. Is this all made up?
How about those manifold dimensions???Also note since His manifold tapers to a point the peak won't be nearly as pronounced as yours.
Do you Sketchup? I'll send you the finished model if so.
HPF=Crossover, so yes you can crossover at ~40Hz and be OK.
Yes the sketch. If you put all the cabinets together they will couple and the tuning shows it @40Hz, it should work very well.
"Also note since His manifold tapers to a point the peak won't be nearly as pronounced as yours."
Mine have no peak.
"I've had your box drawn up since yesterday and I see no manifold dimensions in your BB screen capture. The port width did reverse calc at 2.75" wide, but the pics look wider than that. Also the drivers in the pic are clearly not the Martin 1844's. Is this all made up? How about those manifold dimensions???"
I would have to take a tape measure to them to get all the dimensions, and they're buried in the truck and it's cold. The drivers in the photos are Eminence 15711 which were custom made for my company circa 1988, the Martinsound were just something inexpensive that jammed into my box design, worked, and were available for purchase for others (I don't have any of my drivers for sale anymore). The driver mounting slot is 7" wide, 22.5" tall, and I would have to measure the depth. I make ports with as much area as I can and still have the depth fit in the box and have the correct tuning, I can't remember the depth offhand. The port is huge, doesn't 'chuff', and has no power compression.
This guy should just be able to turn on a 40hz filter in his EQ, crossover, or (whatever) and add a touch of EQ if he wants to. I used to build my crossovers from scratch and the filters are built in. I have also changed filters in crossovers like the Rane AC23 or DBX models, it's easy if you know how. I have added the filter circut to amplifier inputs as well, again, it's easy if you know how.
"Also note since His manifold tapers to a point the peak won't be nearly as pronounced as yours."
Actually, it has been my experience that that style will be worse, but it can be equalized.
Mine have no peak.
"I've had your box drawn up since yesterday and I see no manifold dimensions in your BB screen capture. The port width did reverse calc at 2.75" wide, but the pics look wider than that. Also the drivers in the pic are clearly not the Martin 1844's. Is this all made up? How about those manifold dimensions???"
I would have to take a tape measure to them to get all the dimensions, and they're buried in the truck and it's cold. The drivers in the photos are Eminence 15711 which were custom made for my company circa 1988, the Martinsound were just something inexpensive that jammed into my box design, worked, and were available for purchase for others (I don't have any of my drivers for sale anymore). The driver mounting slot is 7" wide, 22.5" tall, and I would have to measure the depth. I make ports with as much area as I can and still have the depth fit in the box and have the correct tuning, I can't remember the depth offhand. The port is huge, doesn't 'chuff', and has no power compression.
This guy should just be able to turn on a 40hz filter in his EQ, crossover, or (whatever) and add a touch of EQ if he wants to. I used to build my crossovers from scratch and the filters are built in. I have also changed filters in crossovers like the Rane AC23 or DBX models, it's easy if you know how. I have added the filter circut to amplifier inputs as well, again, it's easy if you know how.
"Also note since His manifold tapers to a point the peak won't be nearly as pronounced as yours."
Actually, it has been my experience that that style will be worse, but it can be equalized.
dan,thanks 4 the link. i think it's difficult to learn but i'll try with the video for the beginners.
I was thinking about the box and I noticed the space was tight, too tight. So you will need to find some metal 5qt kitchen mixing bowls ~11-12" id for motor clearance. I also realised that the enclosure needs to have the rear chamber joined or the port tuning will be impossible to get right. Unfourtunately I will have to alter your design somewhat to make it work out. See what you can find for bowls and get me some measurements and pics. What is your time frame to have the boxes completed?
OOPS
Bowls link
OOPS
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Bowls link
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Well,the initial idea was to have the drivers rear loaded ,there should be enough space in the rear chamber to fit them.Don't know if these type of designs MUST work like yours .
If the chambers must be joined I'm thinking the size of the box will become larger?Unless the V is made smaller ,seems odd.
Would have like to have them juiced up by month's end but no big rush.Working on some power meanwhile.$$
Thanks a lot guys for your time and effort!
If the chambers must be joined I'm thinking the size of the box will become larger?Unless the V is made smaller ,seems odd.
Would have like to have them juiced up by month's end but no big rush.Working on some power meanwhile.$$
Thanks a lot guys for your time and effort!
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I was figuring a 3" space at the back, widening to 11" in front (like the original pencil sketch). The 3" was a guess, it may need to be changed.
One could also adopt the format of my PPSL and make the width of the slot the depth of the driver plus the thickness of the frame. Four PPSL 36x30x24 can be made out of six 4x8 sheets of plywood with minimum scrap.
One could also adopt the format of my PPSL and make the width of the slot the depth of the driver plus the thickness of the frame. Four PPSL 36x30x24 can be made out of six 4x8 sheets of plywood with minimum scrap.
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