Hi Guys.
I was planning a speaker project and wondered if anyone could help me with the calculation for a dual-woofer transmission line design.
I can find online calculators for single woofers but not dual, so I'm thinking I need some advice from your expertise 🙂
Many thanks for considering my request.
I was planning a speaker project and wondered if anyone could help me with the calculation for a dual-woofer transmission line design.
I can find online calculators for single woofers but not dual, so I'm thinking I need some advice from your expertise 🙂
Many thanks for considering my request.
On-line TL calculators should be considered a joke. Like any other box, it should be modeled, TL modelers thou are scarce on the ground. There is much more design space than for typical modelers.
For a dual driver TL, double the Vas. Fs, Qt remain the same. Zd should be set the average position of the drivers.
Do you have drivers in mind? What are your goals?
One of ours:
dave
For a dual driver TL, double the Vas. Fs, Qt remain the same. Zd should be set the average position of the drivers.
Do you have drivers in mind? What are your goals?
One of ours:
dave
Looking at something with a big, clear, classic speaker sound but compact enough to keep my wife happy. That's why I thought of the *2 TL design
Nice looking driver. Hornresp can model 2 drivers if you go that way. And spicytl too I believe.
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Seems tiny to me 😉, especially once stretched into a MLTL if no significant series R and/or use the late Professor Leach's preferred Qes and even then only pumps it up to 112.64 L/3.98 ft^3/38 Hz Fb:
T/S max flat alignment:
Vented net volume (Vb) (L) = 20*Vas*Qts'^3.3 = 30.86 L*2 = 61.71 L/2.18 Ft^3
Vented box tuning (Fb) (Hz) = 0.42*Fs*Qts'^-0.96 = 45.4 Hz
F3 (Hz) = Fs*0.28*Qts'^-1.4 = 51.4 Hz
(Qts'): (Qts) + any added series resistance (Rs): http://www.mh-audio.nl/Calculators/newqts.html
T/S max flat alignment:
Vented net volume (Vb) (L) = 20*Vas*Qts'^3.3 = 30.86 L*2 = 61.71 L/2.18 Ft^3
Vented box tuning (Fb) (Hz) = 0.42*Fs*Qts'^-0.96 = 45.4 Hz
F3 (Hz) = Fs*0.28*Qts'^-1.4 = 51.4 Hz
(Qts'): (Qts) + any added series resistance (Rs): http://www.mh-audio.nl/Calculators/newqts.html
The Seas unit does a pretty good job. The TLDesign tool gives convenient starting options for the sizing of the enclosure if you don't already have something in mind. Longish line length can be reduced by a reasonable taper. The ripple can be modelled and smoothed to taste.
Models nearly everything without hurting the brain :
https://www.aj-systems.de/indexe.htm
https://www.aj-systems.de/Pictures/Frontloaded2.png
https://www.aj-systems.de/indexe.htm
https://www.aj-systems.de/Pictures/Frontloaded2.png
Like @planet10 said "Zd should be set the average position of the drivers.". This covers both wiring options:
