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View Full Version : The Return of the TL...part deux



JimJ
02-23-2005, 09:58 PM
Now that I've gotten in touch with the seller, it looks like I can afford to get this thing after all...a possible home for my homeless 15" TC Sounds TC9. It's 9 cubic feet overall, 2.7 cF in the sub chamber. Definitely looks like a quarter wave transmission line. Power will be around 500-750W from a rack amp. Questions are as follows:

1) Would a transmission line such as this work well in home? I'm a little worried that the tuning is too high at 30Hz, but I'm not sure. I guess I should probably clarify my goals for this setup - 75% rock music, with 20% being rap/hip hop and the other 5% being HT.

2) If the tuning is alright for home use, how would this box spec out to the TC9+? According to the spec sheet I have from TC, this driver has a pretty low Qts - something that would be good for a pipe system such as this.

Box gurus are welcome to answer.

diagram of the box here:

http://memimage.cardomain.net/member_images/2/web/698000-698999/698298_53_full.jpg

http://memimage.cardomain.net/member_images/2/web/698000-698999/698298_54_full.jpg

all CAD work was not done by me...so don't blame me if it's off or something :)

Buckshot
02-23-2005, 10:12 PM
all CAD work was not done by me...so don't blame me if it's off or something :)

Hey your missing a line in your drawing :p: You took the picture away last night, so noone else got to see :p:

JimJ
02-23-2005, 11:25 PM
26 views and 1 reply = sad panda.

Mizah Mar
02-24-2005, 12:21 AM
depending on the physical dimensions of that enclosure, it may not extend low enough for ht applications but will be fine for your musical preferences. if you have the t/s parameters for you driver, bbp6, and the dimension of that enclosure, i can show you how to model it. well thats if the ratio of exit area to port taper is constant and doesnt gradually increase/decrease.

JimJ
02-24-2005, 12:35 AM
well thats if the ratio of exit area to port taper is constant and doesnt gradually increase/decrease.

One of the internal walls is slanted, although by how much I don't know...I'll try to get a detailed plan showing dimensions from the builder. T/S params for my driver are available on TC's website...http://www.tcsounds.com as a pdf for the TC9 series.

Mizah Mar
02-24-2005, 12:44 AM
One of the internal walls is slanted, although by how much I don't know...
ahh i know exactly what your talking about now. no problem. i'll walk you through modeling it.

jellyfish420
02-24-2005, 12:50 AM
how do you model slanted port walls on bbp6?

Mizah Mar
02-24-2005, 12:57 AM
baffles in a slot ported enclosure will act like additional resonant devices depending on there positioning. usually its like a regular box. distance from edge of the baffle to the corner x height is the port area, then measure down the center out towards the exit. this only applies if the port area of the "slant board" is the smallest area throughout the entire port length. if there is an area after the "slant board" port/valve that is less than or equal in area, it will become a resonant chamber kinda like a dbr (double chambered reflex).

JimJ
02-24-2005, 01:00 AM
I don't have BBP6 :) if you could be so kind to run a sim...and post graphs :D :D

Mizah Mar
02-24-2005, 01:05 AM
i'll see what i can do, but with this kind of enclosure...there is some phasing issues that i cannot take into account with the programs i have access to. it'll give you a pretty good idea though. a straight baffle, on the other hand, will be possible.

80INCHES
02-24-2005, 01:21 AM
wow jack frost.....that sub u have IS perfect for tl applications.....its has a qts of .18 and a fs of 21hz ****...u should tune that badboy in the 20's and your real good

80

Mizah Mar
02-24-2005, 02:04 AM
if you want a low freq monster, design a box with fb=f3=fs and put a slant baffle so that the 1/4 wave line length is = to fb/f3/fs. now with the slant baffle, make sure that if you model the volume before the slant as the vb and slant corner as the port area with entrailing port length measured down center out towards the exit, that its tuned higher or equivalent to the fb/f3/fs/quarter wave.

JimJ
02-24-2005, 10:19 PM
detailed cut sheet here:

http://www.theaao.com/pics/box/design.jpg