Let's say you want to make a subwoofer 40" long.
To tune it correctly you need a 4" tube 36" long.
So the 4" tube end is 3" from the inside wall. Does this constrain the sound?
What if the tube is by a corner so 2 sides are close to or against it, and the inside wall is 3" away?
How would this affect the sound?
To tune it correctly you need a 4" tube 36" long.
So the 4" tube end is 3" from the inside wall. Does this constrain the sound?
What if the tube is by a corner so 2 sides are close to or against it, and the inside wall is 3" away?
How would this affect the sound?
That is how I've heard it as well.
I know you did not ask or might not care but I'm curious why you cant use a shorter 3" port? Also, 40" is the quarter wave resonance of 83hz is there a reason the box is so long?
Since I know nothing about the design these q's sort of popped into my head. Is this a theoretical question, or is this an actual design, if so we all enjoy details.
I know you did not ask or might not care but I'm curious why you cant use a shorter 3" port? Also, 40" is the quarter wave resonance of 83hz is there a reason the box is so long?
Since I know nothing about the design these q's sort of popped into my head. Is this a theoretical question, or is this an actual design, if so we all enjoy details.
Making it real
Project: Two 15" subwoofers, prefer ported.
Drivers: Dayton 15" reference series High Fidelity drivers. (Ordered expecting in a couple of days. )
Dayton 15" High Fidelity
Space available: Area under Front projection screen to left and right of center channel. Approximately 40" by 29" and 15" deep (need to be a bit shallow).
Materials: 1" think mdf. Well braced. 4" pvc pipe. Walls lined with convoluted foam. Bracing is routed out, details not shown in drawing.
Volume: 185L (approx, accounting for bracing, damping, speaker displacement... etc.)
Vents: Two 4"x 36" pvc tubes, tuning around 16-17hz.
Room is 13' wide by 20' long. Dedicated theater with 108" front projection screen.
Subwoofers will be powered by a pro-amp QSC USA 370 with 185 watts per speaker. I could upgrade to a QSC RMX 1450 or 2450 in the future, if I feel I need it.
Project: Two 15" subwoofers, prefer ported.
Drivers: Dayton 15" reference series High Fidelity drivers. (Ordered expecting in a couple of days. )
Dayton 15" High Fidelity
Space available: Area under Front projection screen to left and right of center channel. Approximately 40" by 29" and 15" deep (need to be a bit shallow).
Materials: 1" think mdf. Well braced. 4" pvc pipe. Walls lined with convoluted foam. Bracing is routed out, details not shown in drawing.
Volume: 185L (approx, accounting for bracing, damping, speaker displacement... etc.)
Vents: Two 4"x 36" pvc tubes, tuning around 16-17hz.
An externally hosted image should be here but it was not working when we last tested it.
Room is 13' wide by 20' long. Dedicated theater with 108" front projection screen.
Subwoofers will be powered by a pro-amp QSC USA 370 with 185 watts per speaker. I could upgrade to a QSC RMX 1450 or 2450 in the future, if I feel I need it.
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