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XTRMEASURES 1st February 2003 06:19 PM

speaker towers
this my first post but i've been comming hear for awhile.
i know very little about home audio so i neen all the help i can get.
i build sum towers for a freind but he does'nt wont them anymore. i was going to sale them or trash them, but i'm going to keep them. the towers are 43.5" x 9.5" x 8" for two speakers one 6.5 and a tweeter. it has a port at the bottom of the front. there is a baffle in the box above the port going up to the back of the speakers.
the question is what speakers to use, i like peerless and vifa but any cheap/good spk would work for me. they have to be 8ohms and handle around 100w each.

please help me


kelticwizard 1st February 2003 11:18 PM

Re: speaker towers
If you used 3/4" MDF, (frequently called particle board), your internal dimensions are 42" X 8" X 6.5" for a total of 2184 cubic inches. This equals 1.26 cu ft, or 35.6 liters for any Metric types who want to contribute to this thread.


Originally posted by XTRMEASURES
it has a port at the bottom of the front. there is a baffle in the box above the port going up to the back of the speakers.
I am not sure what you mean by the above. Do you mean that there is a board glued on the inside of the front board that makes it thicker, or what? Does this board somehow cut the tower into 2 interior sections? Please describe further.

PS: You mentioned that the holes are cut for a 6.5" woofer and tweeter. How big is the tweeter cutout, and how far is the center of the tweeter cutout from the center of the woofer cutout?

XTRMEASURES 2nd February 2003 12:33 AM

the port is a sloted port on the front bottom of the box, the baffel that is inside is like a port. it starts on top of the port and goes up twards the back of the box, but not all the way up just past the speaker.
the hole for the tweet are not cut yet. waiting to see what spk i get.
i pland on getting them and the x-over at madisound.

kelticwizard 2nd February 2003 01:02 AM

2 Attachment(s)
Hmmm, are you talking about something that looks like this? Is the interior board slanted or straight vertical?

I know you don't have the woofer yet, I just put it in there to show where I think the hole might be.

XTRMEASURES 2nd February 2003 02:11 AM

YES YES YES:nod: :nod: :nod:
thats what i was trying to say.
i just would like to know which speakers would work best in that box.

Ilianh 2nd February 2003 02:17 AM

Cant you ask your friend what drivers he had in mind when doing this design?

calculate the lenght of the line, then find a driver with the needed frequency of resonance.

check websites like and

then it could get to "try drivers randomly in simulation apps and see how it works" :)

those designs are not too easy to work with

kelticwizard 2nd February 2003 02:32 AM

You have a Transmission Line Enclosure.

You won't find many Transmission Line Enclosures commercially. that is because they are complex to build, and tuning them right takes some doing. However, the Transmission Line enclosure, when done correctly, gives a sound that many people consider far superior to the other types in use. So Transmission Line Enclosures might be rare, but are considered super hi fi.

I have some bad news and some good news.

First, the bad news. I never built a Transmission Line Enclosure, so I cannot really help you with this.

Now the good news. This board is fortunate to have two people who are not only members here, but also have their own websites devoted to the Transmission Line enclosure.

One is a moderator on this forum, Planet 10. Here is his Profile Page. You can Email him or go to his website from this page.

The other is Martin J. King. His nickname on this board is MJK. Here is his Profile Page. You can also Email him or go to his website from here.

These are definitely the guys you want to talk to.

There are also other people on this board who have successfully built Transmission Lines, and they might also drop in to give you some good advice.

Good Luck! :)

XTRMEASURES 2nd February 2003 02:37 AM

he's working out of state' but i think he was going to get vifa spk.
the woofer was the p17wj-00-04 and the tweet was d27tg-05-06. the spk don't have the same ohm loud. i'm looking for a 8ohm because the receiver has 100w @8ohm.
i was thinking maybe the peerless spk, woofer 850439 or 850467 and the tweet 810665 they both have a 8ohm load.

kelticwizard 2nd February 2003 02:44 AM

Just saw Ilianh's post. We are referring to the same two guys.

Since you built the boxes, you should know the dimensions at various points, what the dimensions are at the speaker cutout point, etc.

If the math gives you any trouble-such things as taper, etc., just post the box dimensions in this thread and I can tell what taper you have, what volume, etc. I won't be able to tell you if it is good or bad, just will do the math for you if that turns out to be an issue.

If your friend returned them because he couldn't make them work, or if the boxes become unworkable for some reason, you can always knock out that divider and make a ported box. I can help you with that.

But that shuld be strictly a last resort. I would try to make a Transmission Line Enclosure first. They really are supposed to be something special.

XTRMEASURES 2nd February 2003 05:54 AM

i think i'll just get the peerless spk and see who they sound. if i don't like it i'll build a new tower.
thankz guyz for the help.
i did'nt know the type of box was so hard to get spk for. i guess thats why my freind did'nt wont it anymore.
if i need any help i know were to look. thankz again.

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