Scott Heaton
Auditioning
- Joined
- Jun 9, 2003
- Messages
- 6
I am planning on making 2 SVS type subwoofers (Sonotube with driver on one side and ports on the other) using Strike's TC Sounds AV12 driver. I plan to lay the subs on their sides behind the couch and drive them with a Sampson S1000 amp.
My goal is to be able to produce sound at near referance levels all the way down to at least 20 Hz.
I am looking at a 125 L volume tuned to 19 Hz.
I have enough 15.5" ID cardboard tube at work and a nearly unlimited supply of free 3 7/8 ID X 4 3/8 OD cardboard tubes that I will use as ports. I am figuring using free ends on the port, although, I may try to later put a bit of a flange into one end.
I calculate using ported.xls that I should use 2 of the ports about 37" long. This gives me a tube length of 48 1/8" long. I get about 5" of clearance from the back of the driver to the ends of the ports.
Questions:
1. Does it look like I am doing this right?
2. Are the ports too long? It seems like I would get chuffing if I used one shorter one.
3. Could someone check my calculations for me on a better program? I check mine on WinISD beta and got about the same numbers.
I guess I am just nervous that I am missing something or doing something wrong because this is my first attempt at DIY speakers and I am just going by everything I have learned on these threads.
I hope I am in bounds asking these questions in an advanced forum. I tried to read up as much as I could about this before posted so I didn't ask a "dumb" question.
Thanks for your help....
AV12
Fs: 21Hz
Qms: 4.41
Qes: .399
Qts: .366
Vas: 88 L
Re: 2.97 ohm
Z: 4 ohm
BL: 15 Tm
Cms: .25 mm/N
Mms: 228 g
Pe: 500W
1W/1m: 85.5dB
2.83V: 89.5dB
Xmax: 23 mm
Xsus: 30 mm
Sd: 498 sq cm
Vd: 2.33 L
My goal is to be able to produce sound at near referance levels all the way down to at least 20 Hz.
I am looking at a 125 L volume tuned to 19 Hz.
I have enough 15.5" ID cardboard tube at work and a nearly unlimited supply of free 3 7/8 ID X 4 3/8 OD cardboard tubes that I will use as ports. I am figuring using free ends on the port, although, I may try to later put a bit of a flange into one end.
I calculate using ported.xls that I should use 2 of the ports about 37" long. This gives me a tube length of 48 1/8" long. I get about 5" of clearance from the back of the driver to the ends of the ports.
Questions:
1. Does it look like I am doing this right?
2. Are the ports too long? It seems like I would get chuffing if I used one shorter one.
3. Could someone check my calculations for me on a better program? I check mine on WinISD beta and got about the same numbers.
I guess I am just nervous that I am missing something or doing something wrong because this is my first attempt at DIY speakers and I am just going by everything I have learned on these threads.
I hope I am in bounds asking these questions in an advanced forum. I tried to read up as much as I could about this before posted so I didn't ask a "dumb" question.
Thanks for your help....
AV12
Fs: 21Hz
Qms: 4.41
Qes: .399
Qts: .366
Vas: 88 L
Re: 2.97 ohm
Z: 4 ohm
BL: 15 Tm
Cms: .25 mm/N
Mms: 228 g
Pe: 500W
1W/1m: 85.5dB
2.83V: 89.5dB
Xmax: 23 mm
Xsus: 30 mm
Sd: 498 sq cm
Vd: 2.33 L