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2 18's in 1/4 Wave T-Line / Isobaric HELP?


Yates

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I tried using sketch up but really sucked I got a bit of work done but I want some help because Im not sure if Im doing it right want it to be loud and clean all help will be so appreciated please please please

SUB SPECS

Diameter (mm) 460
Peak power handling capacity 5400 watts
Nominal power handling capacity 1800 watts
Sensitivity 94 dB (2.83V/1m)
Frequency response Hz 20 - 200 Hz
Impedance 2 x 2 Ohm
Cone material Carbon/fibreglass
Installation depth 245.0 mm
Installation Ø 420.0 mm
Hole circle 452.0 mm
Included Design cover

Thiele/Small parameters
Fres 37 Hz
Qts 0.6
Qes 0.71
Qms 3.8
Vas 36.7 l
Xmax + / - 15.0

​Physical measurements

470mm whole thing

420mm size speaker hole

245mm mounting depth

250mm bottom width

Max measurements

Length 790mm

Height 540mm (can go a bit higher prefer not though)

W 960mm

What I have done so far I

Tuned to 37 Hz change if you think its better (want to stay around 35 to 45 if possible)

1130ft per second is 344424mm per second so 344424 divide by 37 is 9308.756757 divide by 4 = 2327.189189

I was going to use 30mm MDF with duel thickness baffle and was going to mount the subs top inverted bottom one normal and add like a spacer and make sure is totally sealed

Any help would be most apreciated feel free to ask any questions I will do my best to answer the sub specs is all I could get

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I changed it to inches if it makes you happy lol

Diameter (mm) 460
Peak power handling capacity 5400 watts
Nominal power handling capacity 1800 watts
Sensitivity 94 dB (2.83V/1m)
Frequency response Hz 20 - 200 Hz
Impedance 2 x 2 Ohm
Cone material Carbon/fibreglass
Installation depth 9.64567 inches


Installation Ø 16.5354 inches


Hole circle 452.0 mm
Included Design cover

Thiele/Small parameters
Fres 37 Hz
Qts 0.6
Qes 0.71
Qms 3.8
Vas 36.7 l
Xmax + / - 15.0

​Physical measurements

18.5039 inches whole thing

16.5354 inches size speaker hole

9.64567 inches mounting depth

9.84252 inches bottom width

Max measurements

Length 31.1024 inches

Height 21.2598 (can go a bit higher prefer not though)

Width 37.7953

What I have done so far I

Tuned to 37 Hz change if you think its better (want to stay around 35 to 45 if possible)

1130ft per second is 344424mm per second so 344424 divide by 37 is 9308.756757 divide by 4 = 91.621621614173 inches

I was going to use 30mm MDF with duel thickness baffle and was going to mount the subs top inverted bottom one normal and add like a spacer and make sure is totally sealed

Any help would be most apreciated feel free to ask any questions I will do my best to answer the sub specs is all I could get

And I almost forgot the subwoofer area is 180.4450759 cubic inches ( from middle of surround to middle of surround on opposite side that's what i got told to do for measuring )

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A T-Line for two 18's is going to be massive, what kind of vehicle you have? I couldn't imagine anything smaller than a B-pillar wall in an Explorer would be possible. I designed a 27Hz tuned T-Line for two 15's and it took up almost everything from the C-pillar back.

*New vehicle and system coming soon.*

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A T-Line for two 18's is going to be massive, what kind of vehicle you have? I couldn't imagine anything smaller than a B-pillar wall in an Explorer would be possible. I designed a 27Hz tuned T-Line for two 15's and it took up almost everything from the C-pillar back.

I was putting it in an isobaric enclosure so to the t-line its 1 18" woofer but power is more cause its two motors for like a single cone and the more the t-line is tuned low the longer it has to be

isobaric_1.jpg

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