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Old 15th January 2012, 09:13 PM   #31
tb46 is offline tb46  United States
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Hi 2009thread1,

Do you have any idea on a preferred size? When I simulate a TH (for a single JBL GTO804D) in Hornresp I get something around 95/110 L_net. For a tapped horn with a long folded horn path that may mean 125/130 L_gross. Your preferred external size will determine the folding.

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Old 15th January 2012, 09:20 PM   #32
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if i can get it out of one sheet of mdf that would do, if it needs to be big for the sound i should be able to fit in somewhere
if you can sketch it up and email it to me on google sketchup i'd really appreciate it
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Old 15th January 2012, 09:34 PM   #33
tb46 is offline tb46  United States
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Hi 2009thread1,

I haven't found time (or reason, I use ACAD) to learn Google sketchup, maybe NEO Dan can help. I'll attach a first try Hornresp input and spl window:

Regards,
Attached Images
File Type: jpg JBL_GTO804D_TH_Input.jpg (34.9 KB, 360 views)
File Type: jpg JBL_GTO804D_TH_SPL.jpg (30.1 KB, 355 views)
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Old 15th January 2012, 09:38 PM   #34
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thanks, if the tapped horn idea is going to be really big i'll go with the t-line enclosure
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Old 15th January 2012, 09:46 PM   #35
ODougbo is offline ODougbo  United States
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Default P2D28 8"

Just had thought, I have a couple of these unused.

Rockford Fosgate

Fs (Hz): 40.0
Re (Ohms): 3.50
Le (mH): 2.5
Qts: 0.45
Qes: 0.48
Qms: 6.00
Cms (m/N): 0.18
Vas (L): 10.0
Mms (g): 88.5
Mmd (g): 86.9
Rms (kg/s): 3.7
Airload (g): 1.6

SPL (dB - 1W/1M): 84.0
BL (T*M): 13.0

Woofer Displacement: 0.85 0.030 liters | cubic ft
Power Rating: 200 400 RMS | Peak
Linear Excursion, pk-pk (Xmax): 0.315 8.0 inches | mm
Sd (cm2): 200
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Old 15th January 2012, 10:12 PM   #36
tb46 is offline tb46  United States
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Hi 2009thread1,

The sketchup TL looks like 72.38 L_gross, that is a lot smaller. But which one is better? :-)

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Old 15th January 2012, 11:02 PM   #37
tb46 is offline tb46  United States
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And for what it's worth the SPL response of the sketchup TL:

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Attached Images
File Type: jpg JBL_GTO804D_sketchup_TL_SPL.jpg (33.8 KB, 303 views)
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Old 16th January 2012, 06:17 AM   #38
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Quote:
Just had thought, I have a couple of these unused.

Rockford Fosgate
i live in the uk so buying from america will be expensive, how would the rockford fosgates hold out on 250 watts rms ?
Quote:
The sketchup TL looks like 72.38 L_gross, that is a lot smaller. But which one is better? :-)
ive never heard a t-line before, but from videos they're really loud on the lows, but ive never heard an 8" tapped horn before
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Old 16th January 2012, 01:33 PM   #39
NEO Dan is offline NEO Dan  United States
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Quote:
Originally Posted by tb46 View Post
Hi 2009thread1,

I haven't found time (or reason, I use ACAD) to learn Google sketchup, maybe NEO Dan can help. I'll attach a first try Hornresp input and spl window:

Regards,
Don't be looking at me - your the one with AutoCAD

It's not like you need AutoCAD to get good looking output either:
Click the image to open in full size.

Go have a look and VOTE
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Dan
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Old 16th January 2012, 02:07 PM   #40
ODougbo is offline ODougbo  United States
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Amen Brother Neo.
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