John_JLtZD
Grip
- Joined
- Dec 3, 2002
- Messages
- 16
Hello,
My name is John, I'll be attempting to construct my 1st speaker soon and I can definitely use advice.
I'm starting with a subwoofer because that is what I most need. I used to use an old pair of pioneer tower speakers with 10" drivers as my mains and they worked well with subwoofer set to off on my JVC rx-884v receiver. I got a great deal on a pair of Infinity 2000.4's and used them as surrounds with a Cerwin Vega cc-240 as my center channel (tonal balance be damned . My original intent was to replace the Pioneer towers with a big pair of Infinities but that got axed soon after I upgraded my girlfriend to wife status.
After we bought our 1st house the old school pioneers got exiled to the basement from where I fear they will never return. Which leaves the small infinities pulling front speaker duties and very little bass in my system. It took hooking the old pioneers up as temporary subs and playing a few DVD's to convince everyone involved that a dedicated subwoofer is desperately needed.
I've been reading every DIY page I can find and I think I'm self-educated enough now to ask for advice and get started.
I've decided to build a ported sonotube with a 12" driver based off of my room dimensions and my current system setup. I use my system 80/20, HT/Music.
**The Room**
http://www.digitalfarm.com/sonotube/room.jpg
Placement of a large sub in my living room might prove tricky. The blue circles mark the two spots I can think of; 1 - a tall, top ported tube placed behind my entertainment center (which is a solid cabinet with doors) 2 - a shorter, wider, bottom ported tube used as an end table between my couch and an overstuffed chair. Both are in corners, 2 has more space around it but is positioned behind/beside the listeners, 1 is centered between my front speakers but crammed behind the cabinet.
Any thoughts on which placement would work best would be greatly appreciated. I've even thought of taking the 10's out of the old pioneers and building a sealed box to put behind the entertainment center with the sonotube in position #2. I have an old stereo amp and equalizer I could use to drive them but really can't afford to put anymore money into a second sub aside from MDF and glue and I have no clue if that setup would sound right.
**The Driver**
I spent some time with WinISD and PartsExpress to find a 12" driver in my budget range. I've got around $200USD to spend on the Driver and the amp combined. I would have a little more but I need to buy a router/accessories and well, it's the holidays so I'm broke.
The PartsExpress amp is $119 so that leaves about $80 to spend on the driver.
I'm not sure that I'm using WinISD properly but here is what I came up with.
http://www.digitalfarm.com/sonotube/gain_plot.jpg
http://www.digitalfarm.com/sonotube/spl_plot.jpg
http://www.digitalfarm.com/sonotube/box.jpg
http://www.digitalfarm.com/sonotube/vents.jpg
A) Is that a good gain plot?
B) Is that an accurate gain plot for this driver in this box?
C) What exactly is QI and what should I do with it in WinISD?
D) Should I be tuning it to a lower frequency?
E) Is there a better way?
**The Tube**
The diameter and length will be dictated by which of the two placements in the room makes the most sense. The plan is to use two layers of 3/4 mdf for the ends with a 1/4 sheet of plywood on the inside so that the T-nuts will have something to bite in to. Tons of liquid nails, silicon caulk, 'rope' caulk around the speaker, flared ports from partsexpress, a lot of wood glue, drywall screws, and a heavyduty terminal plate.
I'm going keep the amp external in it's own box. The speaker is rated @ 220w rms, 8ohm, the amp specs state that it puts out 180w at 8ohm - should that be enough?
**General**
Should I spray the interior down with rubber? It sounds like a good idea and I read that the 'decron' will stick to it while it's still wet.
When I calculate the internal volume do I want it to end up a bit shy of the desired mark due to the stuffing that will be lining the walls? I'm concerned that if I account for every internal element exactly that the stuffing will make the driver see it as being too big. If the stuffing can increase the effective size of the box by 40% is it safer to build it a little small?
If I'm going to use stuffing should I build in a net to keep the stuffing off of the rear of the driver?
Should I put in any 'poles' between the endcaps to help hold them on?
If I use pannel connectors instead of T-nuts can I skip the layer of plywood?
I've had some impressive systems at work so I _should_ be able to tell if it comes out right but the building is all new territory. Any help no matter how basic it may seem will be greatly appreciated. After this I'll need to upgrade that center channel
Thanks in advance,
John
I would like to mention all of the people who have passively helped me along so far but it would be easier to just say that if you are cool enough to have posted step-by-step instructions I have probably read them and learned from you, so thanks
My name is John, I'll be attempting to construct my 1st speaker soon and I can definitely use advice.
I'm starting with a subwoofer because that is what I most need. I used to use an old pair of pioneer tower speakers with 10" drivers as my mains and they worked well with subwoofer set to off on my JVC rx-884v receiver. I got a great deal on a pair of Infinity 2000.4's and used them as surrounds with a Cerwin Vega cc-240 as my center channel (tonal balance be damned . My original intent was to replace the Pioneer towers with a big pair of Infinities but that got axed soon after I upgraded my girlfriend to wife status.
After we bought our 1st house the old school pioneers got exiled to the basement from where I fear they will never return. Which leaves the small infinities pulling front speaker duties and very little bass in my system. It took hooking the old pioneers up as temporary subs and playing a few DVD's to convince everyone involved that a dedicated subwoofer is desperately needed.
I've been reading every DIY page I can find and I think I'm self-educated enough now to ask for advice and get started.
I've decided to build a ported sonotube with a 12" driver based off of my room dimensions and my current system setup. I use my system 80/20, HT/Music.
**The Room**
http://www.digitalfarm.com/sonotube/room.jpg
Placement of a large sub in my living room might prove tricky. The blue circles mark the two spots I can think of; 1 - a tall, top ported tube placed behind my entertainment center (which is a solid cabinet with doors) 2 - a shorter, wider, bottom ported tube used as an end table between my couch and an overstuffed chair. Both are in corners, 2 has more space around it but is positioned behind/beside the listeners, 1 is centered between my front speakers but crammed behind the cabinet.
Any thoughts on which placement would work best would be greatly appreciated. I've even thought of taking the 10's out of the old pioneers and building a sealed box to put behind the entertainment center with the sonotube in position #2. I have an old stereo amp and equalizer I could use to drive them but really can't afford to put anymore money into a second sub aside from MDF and glue and I have no clue if that setup would sound right.
**The Driver**
I spent some time with WinISD and PartsExpress to find a 12" driver in my budget range. I've got around $200USD to spend on the Driver and the amp combined. I would have a little more but I need to buy a router/accessories and well, it's the holidays so I'm broke.
The PartsExpress amp is $119 so that leaves about $80 to spend on the driver.
I'm not sure that I'm using WinISD properly but here is what I came up with.
http://www.digitalfarm.com/sonotube/gain_plot.jpg
http://www.digitalfarm.com/sonotube/spl_plot.jpg
http://www.digitalfarm.com/sonotube/box.jpg
http://www.digitalfarm.com/sonotube/vents.jpg
A) Is that a good gain plot?
B) Is that an accurate gain plot for this driver in this box?
C) What exactly is QI and what should I do with it in WinISD?
D) Should I be tuning it to a lower frequency?
E) Is there a better way?
**The Tube**
The diameter and length will be dictated by which of the two placements in the room makes the most sense. The plan is to use two layers of 3/4 mdf for the ends with a 1/4 sheet of plywood on the inside so that the T-nuts will have something to bite in to. Tons of liquid nails, silicon caulk, 'rope' caulk around the speaker, flared ports from partsexpress, a lot of wood glue, drywall screws, and a heavyduty terminal plate.
I'm going keep the amp external in it's own box. The speaker is rated @ 220w rms, 8ohm, the amp specs state that it puts out 180w at 8ohm - should that be enough?
**General**
Should I spray the interior down with rubber? It sounds like a good idea and I read that the 'decron' will stick to it while it's still wet.
When I calculate the internal volume do I want it to end up a bit shy of the desired mark due to the stuffing that will be lining the walls? I'm concerned that if I account for every internal element exactly that the stuffing will make the driver see it as being too big. If the stuffing can increase the effective size of the box by 40% is it safer to build it a little small?
If I'm going to use stuffing should I build in a net to keep the stuffing off of the rear of the driver?
Should I put in any 'poles' between the endcaps to help hold them on?
If I use pannel connectors instead of T-nuts can I skip the layer of plywood?
I've had some impressive systems at work so I _should_ be able to tell if it comes out right but the building is all new territory. Any help no matter how basic it may seem will be greatly appreciated. After this I'll need to upgrade that center channel
Thanks in advance,
John
I would like to mention all of the people who have passively helped me along so far but it would be easier to just say that if you are cool enough to have posted step-by-step instructions I have probably read them and learned from you, so thanks