I just purchased TWELVE Adire Shiva drivers that were used at a very good price. I plan on building everyone in my family a sonosub for Christmas that can use one because I'm such a nice guy! This leaves me with roughly 8 Shivas left over.
Currently living in a townhouse and probably will be for another year or so 🙁 I had intentions on building 2 sonosubs for my modest theater room in the basement (guessing 20ft x 14 ft). I was thinking of keeping the other 6 to build an infinite baffle sub when I move into a house but was also thinking, "Why let 6 drivers do nothing for a year?". So, with that in mind, anyone have any ideas of what I could do with 8 Shivas? I'd like to keep whatever I build relatively simple because my tools are pretty crappy; $100 table saw, cheap circular saw, cheap router etc...I'd also like to not have to use 3 full sheets of MDF and have the sucker weigh over 200 pounds.
Is anything easy to build feasable or should I just stick with the dual ported sonosubs and wait for the house?
Thanks!
Currently living in a townhouse and probably will be for another year or so 🙁 I had intentions on building 2 sonosubs for my modest theater room in the basement (guessing 20ft x 14 ft). I was thinking of keeping the other 6 to build an infinite baffle sub when I move into a house but was also thinking, "Why let 6 drivers do nothing for a year?". So, with that in mind, anyone have any ideas of what I could do with 8 Shivas? I'd like to keep whatever I build relatively simple because my tools are pretty crappy; $100 table saw, cheap circular saw, cheap router etc...I'd also like to not have to use 3 full sheets of MDF and have the sucker weigh over 200 pounds.
Is anything easy to build feasable or should I just stick with the dual ported sonosubs and wait for the house?
Thanks!
Maybe 4 per side in an open baffle with active or passive equalization? Nice 8 ohm load, Easy to make a panel with short sides/braces
What do other DIY people think?
What do other DIY people think?
Some dipoles wouldnt be too hard to construct, basic H frames or W's would be easy to build. I'd say doing anything more than that would be a waste of time and money considering you're going to stick them all in an IB once you get the new crib. I agree with variac on this one... dipoles fo shizzle
Ahh I forgot something else, you could make a sealed or ported box of adequate size for 2 shivas, then put all 8 in there as 4 isobaric pairs. That might be reasonable to build...
Ahh I forgot something else, you could make a sealed or ported box of adequate size for 2 shivas, then put all 8 in there as 4 isobaric pairs. That might be reasonable to build...
OH OH OH -- Dual W-baffle dipoles a la linkwitz! What I've been waiting to do with 4 Shivas!!! 
Use the sonosubs for _really low_ and the dipoles for just kinda low. All that and two Shivas left over.😀
Use the sonosubs for _really low_ and the dipoles for just kinda low. All that and two Shivas left over.😀Just had an idea trying to get to sleep! Fiancee is about ready to kill me for waking her up running into the computer room to post this.
My theater is in the basement and 3 walls are concrete. The last wall is drywall and separates it from the rest of the basement. There is a doorway with no door (just an opening) that I've been meaning to fill with a cheap $30 door from Lowes or Home Depot. Remember, this is a small townhouse we're renting and the room is only 20 feet by 14 feet, estimating. Could I do this for an infinite baffle....
Get a cheap door and reinforce it with a piece of 3/4" MDF. Then mount 4-6 of the Shivas on the inside of the door (in the room) to create an infinite baffle? Talk about a cheap subwoofer solution! Maybe get some good dampening for the door jam so when it's closed it doesn't vibrate to death.
What do you guys think? Might go post this on the Infinitely Baffled forum as well.
Thanks!
My theater is in the basement and 3 walls are concrete. The last wall is drywall and separates it from the rest of the basement. There is a doorway with no door (just an opening) that I've been meaning to fill with a cheap $30 door from Lowes or Home Depot. Remember, this is a small townhouse we're renting and the room is only 20 feet by 14 feet, estimating. Could I do this for an infinite baffle....
Get a cheap door and reinforce it with a piece of 3/4" MDF. Then mount 4-6 of the Shivas on the inside of the door (in the room) to create an infinite baffle? Talk about a cheap subwoofer solution! Maybe get some good dampening for the door jam so when it's closed it doesn't vibrate to death.
What do you guys think? Might go post this on the Infinitely Baffled forum as well.
Thanks!
With lots of concrete you are going to have ugly room modes!!! Dipole might be a good idea ...
4 drivers in a W frame dipole operating down to 40 - 50 Hz
Mount the other 4 drivers push pull on the door and only use them below the lowest room mode
Seal the door well. Perhaps make the door as well rather than buy it. Put the drivers in a manifold so the cone travel is parallel rather than perpundicular to the plane of the door. Make the door fairly solid.
To really travel first class to bass heaven, make some diy bass traps and eq the bass with BFD or Ultracurve
4 drivers in a W frame dipole operating down to 40 - 50 Hz
Mount the other 4 drivers push pull on the door and only use them below the lowest room mode
Seal the door well. Perhaps make the door as well rather than buy it. Put the drivers in a manifold so the cone travel is parallel rather than perpundicular to the plane of the door. Make the door fairly solid.
To really travel first class to bass heaven, make some diy bass traps and eq the bass with BFD or Ultracurve
Make a pair of W frame dipoles using 4 shivas each with push/pull and pull/push config. If you still want IB, the work is already done. Just use the W baffle as your manifold, mount it, and cut a hole in the sheetrock. You could even try it in the townhouse, just leaving you 2 sheetrock holes to fix when you move, simple.
Raoul said:
That system is quite a model for the phrase, "Nothing exceeds like excess!". I'd like to see him put a sine wave generator into the system and float a large beachball above the woofer port in the floor!
😀
JohninCR's idea makes a lot of sense, but with mine you get to see 8 woofer cone fronts at once!!🙄
With subs, if possible, I always opt for cancelling out the mechanical motion. With 8 shivas that's exactly 1 kilo of moving mass whose vibration is likely to be felt in the floor even in a basement. Give me the sound and only the sound.
Unless they changed the design, the Shiva Pole vent is rather noisy, that is why Adire made the DPL12 for dipoles.
I'd probably put all 8 in two relatively small sealed boxes (perhaps 2 cubes net each - woofers on the four side faces) and do a variable linkwitz transform.....like the Marchand Bassis..
I'd probably put all 8 in two relatively small sealed boxes (perhaps 2 cubes net each - woofers on the four side faces) and do a variable linkwitz transform.....like the Marchand Bassis..
If the pole vent noise is true, then don't go with push/pull. You should check that first, because I don't remember noise breaking mine in running them free air at just below full excursion.
Linkwitz talks about this on his site. The XLS has more dipole output as you can use all its excursion, unlike the Shiva which whistles when you get to 0.7" excursion. I think you can only use about half the excursion of the shiva. However, with 8 of them, this is less of a problem.
Still, I think IB and dipole gives you the best of both world - use the dipoles in the midbass to tame room modes but avoid crazy excursion, then use the other half in IB to cover the low end below say 50 Hz. Put a highpass on the dipoles to keep their excursion down
Still, I think IB and dipole gives you the best of both world - use the dipoles in the midbass to tame room modes but avoid crazy excursion, then use the other half in IB to cover the low end below say 50 Hz. Put a highpass on the dipoles to keep their excursion down
Vent noise
I believe the amount of vent noise, and at what level it becomes audible are very dependant on frequency. You probably wont hear the vent breathing while the sub is pounding away at 50 hz or some plainly audible frequency, but at below 20hz, you cant hear much of the actual tone being played. You'll hear the walls rattle and what else, vent noise. If you get the walls to rattle enought, you probably wont notice the vent whistling. I dont know how true this is with the shiva, as I've never listened to one. But with speakers I've had before I only noticed vent noise at infrasonic frequencys.
I believe the amount of vent noise, and at what level it becomes audible are very dependant on frequency. You probably wont hear the vent breathing while the sub is pounding away at 50 hz or some plainly audible frequency, but at below 20hz, you cant hear much of the actual tone being played. You'll hear the walls rattle and what else, vent noise. If you get the walls to rattle enought, you probably wont notice the vent whistling. I dont know how true this is with the shiva, as I've never listened to one. But with speakers I've had before I only noticed vent noise at infrasonic frequencys.
Andy, for dipole or IB use things are very different to monopole vented subs. A high excursion driver with a stamped basket and without a pole vent or other alternative will have a lot of turbulence when the cone starts moving. Normally this is kept in a box and masked by output, but in a dipole this is critical.
Paul,
why do you keep calling me andy bro? Its Awdyo (pronounced audio) anyways, I do understand that there is quite a difference with dipole designs. Using subs isobaric in a monopole with a magnet and pole vent exposed has given me a slight idea about the effects of pole vent noise. Like I said before, I've only had pole vent noise issues at infrasonic frequencys where there is no sound to cover over the noise of a pole vent. I guess with dipoles the amount of output near the low frequency cutoff of the ear is even lower despite the drivers having to excursion further. Anyhow, I had an idea. Perhaps there is a way to attach a flanged jet to the end of the vent which would lower turbulence and vent noise. When a port whistles rounded flanges typically help, so perhaps they would also help with pole vents
why do you keep calling me andy bro? Its Awdyo (pronounced audio) anyways, I do understand that there is quite a difference with dipole designs. Using subs isobaric in a monopole with a magnet and pole vent exposed has given me a slight idea about the effects of pole vent noise. Like I said before, I've only had pole vent noise issues at infrasonic frequencys where there is no sound to cover over the noise of a pole vent. I guess with dipoles the amount of output near the low frequency cutoff of the ear is even lower despite the drivers having to excursion further. Anyhow, I had an idea. Perhaps there is a way to attach a flanged jet to the end of the vent which would lower turbulence and vent noise. When a port whistles rounded flanges typically help, so perhaps they would also help with pole vents
mazeroth said:
If you want a really good sonotube design for the Shiva, contact me at skephart@adireaudio.com.
Steven Kephart
Adire Audio
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