4th order bandpass has higher tuning, probably what confused me.
If your looking for compact enclosure, I think isobaric loading / push pull is they way to do it.
Bandpass needs a additional chamber so they tend to be larger boxes.
I believe the first issue was large vent not fitting.
You can just do a normal reflex box and use isobaric, then the additional space the bandpass would have needed.
can be used for vent area.
Only way to lower tuning with passive radiator is to add mass.
excluding the additional cost of using 2x radiators, also taking into account
the radiators displace volume, so the the chamber has to be even larger to make up for displacement.
Keep in mind with normal vented enclosure tuned around 30 Hz.
In model you only apply enough power to reach Xmax around 30 hz.
Then also use subsonic filter.
If you apply filter and apply realistic power.
You will find your expected vent velocity is much lower than expected.
And overall port area is much smaller than expected and easy to fit in box.
I could try and do simulation, but cannot find specific TS parameters
for drivers being used.
If your looking for compact enclosure, I think isobaric loading / push pull is they way to do it.
Bandpass needs a additional chamber so they tend to be larger boxes.
I believe the first issue was large vent not fitting.
You can just do a normal reflex box and use isobaric, then the additional space the bandpass would have needed.
can be used for vent area.
Only way to lower tuning with passive radiator is to add mass.
excluding the additional cost of using 2x radiators, also taking into account
the radiators displace volume, so the the chamber has to be even larger to make up for displacement.
Keep in mind with normal vented enclosure tuned around 30 Hz.
In model you only apply enough power to reach Xmax around 30 hz.
Then also use subsonic filter.
If you apply filter and apply realistic power.
You will find your expected vent velocity is much lower than expected.
And overall port area is much smaller than expected and easy to fit in box.
I could try and do simulation, but cannot find specific TS parameters
for drivers being used.
Manufacture doesn't even list
But it seems to be older legacy product from " Hi Energy Line"
I found a link with pair for sale and the seller listed TS parameters
all I could find......
This is 12" driver.....also assuming the 300 meaning " 300mm" or 12"
Xmax: 8mm
Fs: 29.92 Hz
Re: 3 (ohm)
Le: 2.89 mH / 1kHz
Mms: 119.6 gr.
Vas: 96.02 L
Cms: 0.24 mm / N
Qts: 0.23
Qes: 0.27
Qms: 1.55
Bxl: 15.81 Wb / m
But it seems to be older legacy product from " Hi Energy Line"
I found a link with pair for sale and the seller listed TS parameters
all I could find......
This is 12" driver.....also assuming the 300 meaning " 300mm" or 12"
Xmax: 8mm
Fs: 29.92 Hz
Re: 3 (ohm)
Le: 2.89 mH / 1kHz
Mms: 119.6 gr.
Vas: 96.02 L
Cms: 0.24 mm / N
Qts: 0.23
Qes: 0.27
Qms: 1.55
Bxl: 15.81 Wb / m
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If I remember correctly, WinIsd wont calculate cone excursion without SD
you can still simulate driver, but no cone excursion.
Taking wild guess you are looking at " 700" watts of vent velocity at max power.
when its likely this is mechanically limited to around 200 watts.
I will check, in order to get cone excursion to work you would have to enter feasible
SD size for 12" subwoofer.
around 506 to 540 cm2
you can still simulate driver, but no cone excursion.
Taking wild guess you are looking at " 700" watts of vent velocity at max power.
when its likely this is mechanically limited to around 200 watts.
I will check, in order to get cone excursion to work you would have to enter feasible
SD size for 12" subwoofer.
around 506 to 540 cm2
Can cross calculate since we know BL = 15.8
BL = 15.808 Tm
Cms= .2365 mm/N
Rms = 14.511
Sd = 535 cm^2
BL = 15.808 Tm
Cms= .2365 mm/N
Rms = 14.511
Sd = 535 cm^2
Well what a design challenge!!
Now that I see it in simulation.
Ok, this would be a double folded slot port.
its easy to double fold using material thickness/ and then driver height.
tall and narrow port basically.
Since you know the box will at least be as big as the woofer itself.
19mm port which is thickness of plywood/mdf used and 300mm height of woofer
so 19mm x 300mm port folded once will be 600mm length.
Your original design is about right. trick is to slightly enlarge the second chamber and slightly raise tune , which helps shorten the length of port
So 14 liter main chamber 6 liter second, and can tune around 65 Hz
Slot port actually appears longer than it really is, and WinIsd you cant change correction factor.
@ full 700 watts I believe velocity was around 22m/s rule of thumb is 18m/s
but you wont be running full power all the time at home.
Now that I see it in simulation.
Ok, this would be a double folded slot port.
its easy to double fold using material thickness/ and then driver height.
tall and narrow port basically.
Since you know the box will at least be as big as the woofer itself.
19mm port which is thickness of plywood/mdf used and 300mm height of woofer
so 19mm x 300mm port folded once will be 600mm length.
Your original design is about right. trick is to slightly enlarge the second chamber and slightly raise tune , which helps shorten the length of port
So 14 liter main chamber 6 liter second, and can tune around 65 Hz
Slot port actually appears longer than it really is, and WinIsd you cant change correction factor.
@ full 700 watts I believe velocity was around 22m/s rule of thumb is 18m/s
but you wont be running full power all the time at home.
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Thanks!
Right, appears to be a 12" from their original lineup, but for all the info I scanned through including (old) sales got only it being a traditional spec'd 12", which 'your' specs confirm.