I dunno? It’s all very interesting!
Briefly Simulating both of these kind of points out the similarities between the two . Creating an offset driver is kind of pointless or redundant on the same box volume (?) That extra panel might as well be a brace instead as it changes very little and might even create a little hiccup at that second pipe resonance it creates ?
Briefly Simulating both of these kind of points out the similarities between the two . Creating an offset driver is kind of pointless or redundant on the same box volume (?) That extra panel might as well be a brace instead as it changes very little and might even create a little hiccup at that second pipe resonance it creates ?
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FWIW it's what me n' others concluded way back when; among other accolades, mine have been referred to as 'smooth as a baby's bottom', though admittedly with dual vintage Altec 515B, their ~14 - 5 k+Hz BW @ 112+ dB/4 ft eff. corner loaded pretty much defines 'life-like', 'is it live or is it Memorex', 'heart attack', 'fast' with only a full size horn in theory besting them and even then its HF BW will be more rolled off, so for typical HIF/HT my two dual 20 ft^3 cabs even in 2pi space is easily the ''hands down' winner, yet few have ever followed.
edit: seems like camplo was one that opted for something else. Found it.........
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Yet here I am still researching vented designs lol.
This design is still missing the top and bottom baffle.
You
Me
I didn't purposely match those dimensions, or did I.....weird huh, somehow your influence is still in the design =)
I think the non parallel walls are a good thing. I think it helps to tame the harmonic cancellation in the resulting FR
https://aafradio.org/audio/Jensen_T...N4n4NSK6M-jL-96G0mRjpPKDomZkUDb0NCKZH6GS38fqo
here’s a great article on the simple version
here’s a great article on the simple version
@camplo , I noticed that in the simulation when there’s a taper, the cancellation notch gets partially filled in. I wasn’t sure if that was just a math artifact or something real that we could actually notice by measuring. Everything is pretty spot on and obvious if using straight rectangular geometries it seems
If I follow, then maybe my latest response will be a sufficiently extreme example as to which is best overall. 😉
Hey, so i compared the POC3 vs the PAL12 with the same SKAR DDX12
and POC3 is hands down best suited for the DDX12
so, i know is a sacrilege to even mention to build one with 15mm ply instead of 18mm ply
but, can it be done ?
is it realistically possible or the extra bracing will ruin the weight drop from 18mm to 15mm ply
in the other hand i want to make one POC3
hope Brian chime in and comment if there is anything that need to be changed like a dimension or 2 on his POC3 plans
this is what i copied from his webpage for the POC3
and i simmed a skars DDX12
And tweaking the Horn Length to 334cm we get 30hz response
even we hit 18mm xmax on the driver but somebody here pointed that you can go +/- 20% of xmax ?
Altough with the filters engaged we are within limits for 800watts
and POC3 is hands down best suited for the DDX12
so, i know is a sacrilege to even mention to build one with 15mm ply instead of 18mm ply
but, can it be done ?
is it realistically possible or the extra bracing will ruin the weight drop from 18mm to 15mm ply
in the other hand i want to make one POC3
hope Brian chime in and comment if there is anything that need to be changed like a dimension or 2 on his POC3 plans
this is what i copied from his webpage for the POC3
and i simmed a skars DDX12
And tweaking the Horn Length to 334cm we get 30hz response
even we hit 18mm xmax on the driver but somebody here pointed that you can go +/- 20% of xmax ?
Altough with the filters engaged we are within limits for 800watts
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make one out of scrap wood/mdf to test?
Dont try to tune it below the mid 30s, it sucks, fs 38-40hz, Qes in the 0.35 ish range … It had no deep extension/low note authority in the ‘paraflex’ designs we built, maybe this tapped horn will be more ‘underdamped’ at Fb And liven it up?
Dont try to tune it below the mid 30s, it sucks, fs 38-40hz, Qes in the 0.35 ish range … It had no deep extension/low note authority in the ‘paraflex’ designs we built, maybe this tapped horn will be more ‘underdamped’ at Fb And liven it up?
Paging DR. Brian... Paging DR. Brian... CODE BLUE!! CODE BLUE!!!
What you Think Brian, do i dare to tune the thing at 30Hz or leave it untouched for the DDX12 ?
What you Think Brian, do i dare to tune the thing at 30Hz or leave it untouched for the DDX12 ?
With the Ciare 12.00SW-8 @1250watts we have the below
it is rated at 14mm XMAX so 16.8 qualify within the +/- range ?
the ciares are 399 in USA.... so maybe dual SKAR's cabinet ? thing is if you add another SKAR the freq response change a lot
well... not that much !!! so with 4 DUAL loaded POC3's with DDX12's we have... lets see.....
Not Bad!! at All !!!! Weeeee !!!!
https://www.skaraudio.com/products/ddx-12-inch-car-subwoofer?variant=DDX-12 D4
right now they are at 157 so 314 per cabinet... times 4 ? 1256 !! not bad a QSC KS118 is 1999
and will not hit 140db ( yeah 1256 plus the amps and processing and the plywood )
but you get the idea.
it is rated at 14mm XMAX so 16.8 qualify within the +/- range ?
the ciares are 399 in USA.... so maybe dual SKAR's cabinet ? thing is if you add another SKAR the freq response change a lot
well... not that much !!! so with 4 DUAL loaded POC3's with DDX12's we have... lets see.....
Not Bad!! at All !!!! Weeeee !!!!
https://www.skaraudio.com/products/ddx-12-inch-car-subwoofer?variant=DDX-12 D4
right now they are at 157 so 314 per cabinet... times 4 ? 1256 !! not bad a QSC KS118 is 1999
and will not hit 140db ( yeah 1256 plus the amps and processing and the plywood )
but you get the idea.
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a friend replaced the ddx12 with those in a 4 x 12 parallel resonator design and it sounded much ‘WarMer’