Go Back   Home > Forums > Loudspeakers > Full Range

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 18th August 2004, 05:51 PM   #1
diyAudio Member
 
Join Date: Jan 2004
Location: Minnesota
Default questions on a FE167 TQWT design.

After more studying... I have decided on a FE167 design.

I was reading a little about these and have decided that the flare shall be out of the top like these:

http://www.melhuish.org/audio/DIYTQ8.html

question is: where do i find out about enclosure dimensions for this style.. ?

Of course I will add an BSC circuit and a zobel network..

any help would be appreciated.
  Reply With Quote
Old 18th August 2004, 06:03 PM   #2
MJK is offline MJK  United States
Account disabled at member's request
 
Join Date: Feb 2002
Location: Clifton Park, NY
Before building a TQWT design, I suggest reading Bob Brines' site for an excellent tutorial on tapered pipe designs. His site is linked from mine and he has a design for the FE-167E already done.

Or you might want to consider my ML TQWT design. The FE-167E is a drop in replacement for the discontinued FE-164 driver. Many people have built this design and provided very positive feedback. Several examples can be seen in my gallery where there are e-mail links so that you can ask the builder questions directly.

Hope that helps,
  Reply With Quote
Old 18th August 2004, 06:04 PM   #3
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
The dimensions for Terry's enclosure are given in the
text of his article, which are 7 x 14 x 70 inches and he
gives additional details on driver location and internal
baffle.

BTW, it's my experience that if you are out in the room
with such an enclosure (as opposed to the corner or
perhaps against the wall) you should consider turning
them upside down and see what you get. If they are
firing into the floor carpet, you can get a pretty nice effect.
Of course they must be elevated to create an opening, but
you can tune the opening by varying the height.
  Reply With Quote
Old 18th August 2004, 06:14 PM   #4
diyAudio Member
 
Join Date: Jan 2004
Location: Minnesota
Default 40-1354

Is this RS driver similar to the FE167??

Also, what about stuffing the line?... any rules of thumb?

Thanks!
  Reply With Quote
Old 18th August 2004, 06:41 PM   #5
diyAudio Member
 
Join Date: Jan 2004
Location: Minnesota
Default going to use this design:

http://geocities.com/rbrines1/

Click on the straight pipe info.

question is this: this design uses a 5 1/4 driver with throat = Sd and mouth area = 4 Sd.

where are these areas in the diagram?

for a 6in driver like the FE167... how much do I need to increase the size of this enclosure?

Thanks!
  Reply With Quote
Old 18th August 2004, 08:18 PM   #6
MJK is offline MJK  United States
Account disabled at member's request
 
Join Date: Feb 2002
Location: Clifton Park, NY
Quote:
Is this RS driver similar to the FE167??
No, don't waste your time with the RS driver. The Fostex FE-167E is a much better driver.

Quote:
Also, what about stuffing the line?... any rules of thumb?
The drawings all show the location and stuffing density. Why would you want to do something different?

Quote:
question is this: this design uses a 5 1/4 driver with throat = Sd and mouth area = 4 Sd.
S0 = 1 x Sd is at the top of the enclosure, the small pointed and closed end.

SL = 4 x Sd is at the bottom of the enclosure, the larger end with the opening.

Bob's plans show the dimensions at each end and the location of the stuffing.

Quote:
for a 6in driver like the FE167... how much do I need to increase the size of this enclosure?
To answer this question you will need to rerun the MathCad simulation with the properties of the FE-167E driver. This is a complete redesign of Bob's RS 1354 pipe and will be a bigger enclosure and a different BSC circuit. Are you willing to take on the effort required to redesign the enclosure? I am not sure where you are headed.
  Reply With Quote
Old 18th August 2004, 08:44 PM   #7
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Certainly it's easy enough to play with the stuffing location
and density.

I stuff the enclosures to taste. In addition to the vagaries
of the location and room, your own subjective needs need to
be considered.
  Reply With Quote
Old 18th August 2004, 10:06 PM   #8
diyAudio Member
 
Join Date: Jan 2004
Location: Minnesota
Default redesign

Yeah... i want to re-design the enclosure.

I am D/L the mathcad software as we speak.

How does the port or slot loading at the mouth area or SL come into play?

For the FE167 the S0 is 20 square inches, SL is 80 square inches.

correct?

The BSC circuit doesn't bother me... I can design that with zobel and baffle step compensation.
  Reply With Quote
Old 18th August 2004, 10:53 PM   #9
MJK is offline MJK  United States
Account disabled at member's request
 
Join Date: Feb 2002
Location: Clifton Park, NY
Quote:
How does the port or slot loading at the mouth area or SL come into play?
If you look at the cabinet design section of my Project #4, there is a write up that describes how the port works in a ML TL. The same idea is true for the ML TQWT.

Quote:
For the FE167 the S0 is 20 square inches, SL is 80 square inches. correct?
Looking at the drawing in my Project #2 article.

S0 = 2.5 x 10 = 25 in^2

SL = 14 x 10 = 140 in^2

L = 60 in (height of my enclosure)

r_port = 1.5 in

L_port = 2 in (in my final configuration)

That is what I ended up building.
  Reply With Quote
Old 19th August 2004, 12:02 PM   #10
diyAudio Member
 
Bob Brines's Avatar
 
Join Date: Jan 2003
Location: Hot Spring Village AR
Since my name is getting thrown around here, I guess I should comment.

My experiece is that any driver that will work in a TQWT will work in a rectangular MLTL. The only reason for choosing the TQWT is aesthetic, bacause the MLTL will be much more compact. My current enclosure for the FE167E is 40"x8.5"x8.5", the driver 11.5 down from the top and a 3"x4" port 4.5" up from the bottom. I'll update my web page someday.

These dimensions were chosen to minimize ripple an still get F3 down to 40Hz. Wiht a lining of 1/2" yellow fiberglass, very little additional stuffing is needed.

Before you do the "Bigger is Better" or a scaled up version, run a MathCAD sim on it. You may be surprised.

Bob
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Newbe questions TQWT using fostex FE206E LazyJones Full Range 8 30th October 2007 03:27 PM
Basic ML TQWT Questions Shae Full Range 1 8th October 2007 08:14 AM
Another FE-127e ML-TQWT Design eeyore Full Range 0 25th July 2007 11:38 PM
Searching for FE167 Karlson Design bluegti Full Range 14 11th March 2007 07:42 AM
TQWT W4-656S A few questions. swirv Multi-Way 14 5th October 2002 10:57 PM


New To Site? Need Help?

All times are GMT. The time now is 09:30 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2