hi!
i have aquired 4 eminence ps18-6008 speakers, so im right now struggling with a design for them.
my goal is to have them as compact enclosures as i can get,
used some online calculator and winisd, they suggest 3 types of enclosures.
77L tuned 42Hz for power handling
82L tuned 35Hz as "HIFI" most flattest
136L 44Hz for most bass extension.They are all manageble sizes that suits me.
BUT! im wondering is out there some other designs, that would be more effective on a output than reflex enclosure.
i happened to build a set of cubo subs for a rcf l18p300 and listened them side by side with a BR enclosure with the same driver, didnt hear the BR 😀unfortunally im not allowed to own/build near 300L enclosures, so am i stuck with the BR designs or is there something else out there.
they will be used 70% outdoor family/frend/foe deafening/silencing barbeques and the rest of time they will be indoors playing quietly.
all opinions are welcome.
Ps! i wont sell them.
i have aquired 4 eminence ps18-6008 speakers, so im right now struggling with a design for them.
my goal is to have them as compact enclosures as i can get,
used some online calculator and winisd, they suggest 3 types of enclosures.
77L tuned 42Hz for power handling
82L tuned 35Hz as "HIFI" most flattest
136L 44Hz for most bass extension.They are all manageble sizes that suits me.
BUT! im wondering is out there some other designs, that would be more effective on a output than reflex enclosure.
i happened to build a set of cubo subs for a rcf l18p300 and listened them side by side with a BR enclosure with the same driver, didnt hear the BR 😀unfortunally im not allowed to own/build near 300L enclosures, so am i stuck with the BR designs or is there something else out there.
they will be used 70% outdoor family/frend/foe deafening/silencing barbeques and the rest of time they will be indoors playing quietly.
all opinions are welcome.
Ps! i wont sell them.
i think the problem lies with me, but seriously, 50cm*55cm*30cm gives me 82,5litres already`? (- speaker and port displacement) and im good ?
darn, the paraflex build ruined my perpective of sizes. In the weekend i just have to build one out of the scrap furniture wood, to see that it really plays in that small enclosure.
darn, the paraflex build ruined my perpective of sizes. In the weekend i just have to build one out of the scrap furniture wood, to see that it really plays in that small enclosure.
140 litres is pretty big. X 2.
If it is a small room, you might actually consider sealed, where a/ the slower roll-off might better match the room and sealed allows for EQing. It takes more power & more excursion, but given 4 BIG woofers in a small room, you should have lots of latitude to take it as low as you want (within reason). You will be able to go lower than in a reflex since they will unload below their tuning.
Outside, a totally different application. You won’t have room gain, and you will be playing LOUD. 100 litres for 2 drivers can be made to work (a puchy alignment, what you want for a party). Use a slot vent and have a suitable size piece of foam to stuff into it, making it (at least sort of) aperiodic. Closed cel will get it close to sealed. Sealed boxes have significant size latitude if you are not too big or too small, so the size could be increased for a bit more extention at the sacrifice of punch.
Smaller box is also easier to hold together.
One of the pro subwoofers i have seen only used the woofer in its roll-off region with EQ.
You can deguise them, or use tham as part of shelf if they are too big.
dave
If it is a small room, you might actually consider sealed, where a/ the slower roll-off might better match the room and sealed allows for EQing. It takes more power & more excursion, but given 4 BIG woofers in a small room, you should have lots of latitude to take it as low as you want (within reason). You will be able to go lower than in a reflex since they will unload below their tuning.
Outside, a totally different application. You won’t have room gain, and you will be playing LOUD. 100 litres for 2 drivers can be made to work (a puchy alignment, what you want for a party). Use a slot vent and have a suitable size piece of foam to stuff into it, making it (at least sort of) aperiodic. Closed cel will get it close to sealed. Sealed boxes have significant size latitude if you are not too big or too small, so the size could be increased for a bit more extention at the sacrifice of punch.
Smaller box is also easier to hold together.
One of the pro subwoofers i have seen only used the woofer in its roll-off region with EQ.
You can deguise them, or use tham as part of shelf if they are too big.
dave
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Yes and no in that outdoors the speakers may/will be heated up enough to lose a significant amount of SPL, linearity due to thermal power compression and why the pioneers concluded that a Vb = [measured] Vas/1.44, Fb = [measured] Fs*1.56 was best overall for such apps and when 'shrinking' it their minimum acceptable alignment was quartering it = [measured] Vas/1.44^4 = ~82.45 L/43.8 Hz, which per HR yields a minimum ~115 dB/m/2pi/300 W/Xmax from Fb - up with a [recommended] 224 cm^2 x 28.5 cm long shelf vent = ~88.44 L net + driver, any bracing with four square on the ground outdoors = ~127.5 dB/m/2pi/300 W/Xmax from Fb - up.
I didnt think “that” compact enclosures. Im good about 100l per driver. They will be separate enclosures anyway, so i could transport them alone if needed.
OK, my calcs are for a single driver. Regardless, when 'working' with such a huge Vas, low Qts' spec driver, the acoustically tiny extra net Vb, +/- a peaking dB or two isn't worth the extra cost, but if you choose to then the vent's length 'shrinks' to 25 cm.
Hmm, just noticed I let two thoughts sum to one to create a misleading conclusion 🙁, i.e. the vent lengths are for typical round tubes or square ones of the same area, but recommend a shelf vent that would be quite a bit shorter and much more tedious to tune for most DIYers, though if wanting to try one: K = 2.227
Hmm, just noticed I let two thoughts sum to one to create a misleading conclusion 🙁, i.e. the vent lengths are for typical round tubes or square ones of the same area, but recommend a shelf vent that would be quite a bit shorter and much more tedious to tune for most DIYers, though if wanting to try one: K = 2.227
ok. besides reflex enclosures, is there any other designs that will outperform reflex enclosure, like cubo series. Unfortionally cant make them this time since they are almoust 300l and that wont pass waf.
i can do max 50*50*70 enclosure each. (well for one man transportation)
i can do max 50*50*70 enclosure each. (well for one man transportation)
Don't know, haven't followed the various small horn cab threads, though a 'quickie' simple one segment horn sim in ~170 L winds up with a ~107.7 Hz flare frequency/0.69 flare factor, ~91 Hz Fc/50 Hz F-24.
A good sealed designs are often what I seek. Mostly 8 inch subs, sealed with and without passive radiators. had so many over time. As long as the amp EQ sub itself (not all sound good sealed even though they claim it so), it has ideal parameters. You can create some hard hitting dynamic lows that punch hard and sound great.
I'll settle a curiosity or two tomorrow when I get chance to hook up a sealed 8" with a later Crown PA amp, drive core2. I don't quite know what to think about an amp that only weighs 10 lbs and running sub duty.
My a/b out weighs it by 40 lbs easily yet the crown has 100 more wpc going in to 4 ohms x 2. And can bridge 1100 x 1.
I started working on a box to house a single sealed 8 with 1.25 wall thickness. It shouldn't budge and should slam loud and clear.
I'll settle a curiosity or two tomorrow when I get chance to hook up a sealed 8" with a later Crown PA amp, drive core2. I don't quite know what to think about an amp that only weighs 10 lbs and running sub duty.
My a/b out weighs it by 40 lbs easily yet the crown has 100 more wpc going in to 4 ohms x 2. And can bridge 1100 x 1.
I started working on a box to house a single sealed 8 with 1.25 wall thickness. It shouldn't budge and should slam loud and clear.
Perch a heavy potted plant or other weight that's > ~2x heavier on top to mass load it for a bit more.
Thats funny ;p.
I just used a bag of sand instead 😉. while coupled to hardwood. Nicely achored for better which to slam.
I got my xls1002 Crown, powering one sub, no sweat at all. I'm not even starting to work the thing and its shaking dishes up in the kitchen. I wasn't sure what to think until trying it. Seriously good valued subwoofer power. https://www.audiosciencereview.com/forum/index.php?threads/crown-xls1002-pro-amplifier-review.16211/
It seems that nothing would outdo good ported box in power density, and nothing will outdo a hybrid horn in speaker utilisation. You pick your poison. 🙂
Iwould gladly use hybrid enclosure if it would just fit besides my other furniture. 50cm deep.
I was going to say horn 🙂.
I always wanted to build a "compact" horn. Not exactly compact but smaller then most. Most of you probably heard of the anarchy horn?
It incorporates a 6" subwoofer driver. And then there are those (including myself) that believe if your going to go big go big properly. I seen a guy put a 10" sub folded horn in every corner, just about reaching his ceiling. Hes on his own. I couldn't get away with that.
I had my fair share of proof of concepting small tapped horns:
🙂
It was a 6$ driver and not that much effort. I was happy with the outcome. It is certainy doable. Yet the power density is on the side of bassreflex box, if you can use biggest strongest driver for the volume available.
🙂
It was a 6$ driver and not that much effort. I was happy with the outcome. It is certainy doable. Yet the power density is on the side of bassreflex box, if you can use biggest strongest driver for the volume available.