Port on MJK's ML TQWT?

leadbelly · 27th May 2003, 12:48 AM

I seem to remember this being asked and answered a while back, but I just can't find it with Search, so...

Can I move the port on Martin King's FE164 ML TQWT design from the front to the rear with no other changes?

planet10 · 27th May 2003, 03:48 AM

Quote:

Originally posted by leadbelly
Can I move the port on Martin King's FE164 ML TQWT design from the front to the rear with no other changes?

Or the bottom as long as it is at the end off the line. Martin tends to like his on the front thou -- most of my recent efforts have had it out the bottom and everything jacked up a bit on a stand to get a bit more height.

dave

leadbelly · 27th May 2003, 04:30 AM

Thanks Dave,

I prefer the aesthetics of port in the back myself.

Does the base slab weight or density have a significant impact on sound? I haven't cut pieces yet, and can cut them out of either 1" or 3/4" MDF, or even other things like cheap pine or cheap plywood if acceptable.

planet10 · 27th May 2003, 09:02 AM

Mostly building out of plywood these days, and the speakers tend to be tall, skinny, & top-heavy (where the drivers are). So the prime purpose of the base is to get a little wider footprint. Using something with some mass is also useful in helping them from tipping. With the bipoles we build, rocking from the speaker moving in and out is not an issue, but it could be with a box with front firing only speakers.

Aesthetically we like the base offset from the speakers with copper pipe, so when we need it we put the port on the bottom.

dave

Bricolo · 27th May 2003, 10:18 AM

is there any difference in sound quality between a front port and a back port? (not only for TL ports, BR too)

planet10 · 27th May 2003, 05:02 PM

Quote:

Originally posted by Bricolo
is there any difference in sound quality between a front port and a back port? (not only for TL ports, BR too)

In a BR a port is often put on the back so that any higher frequency garbage is in the shadow of the box. In a well designed TL that garbage should have been killed by the geometry or the stuffing.

dave

Bricolo · 27th May 2003, 07:46 PM

and with no HF garbage, is there any difference in sound quality?

pinkmouse · 27th May 2003, 07:51 PM

It's down to taste, some people like it direct, (front), some like it diffuse, (rear).

A rear port can also minimise the chuffing sound of a box or port worked too hard.

27th May 2003, 12:48 AM	#1
leadbelly diyAudio Member Join Date: Dec 2002 Location: Calgary, Alberta	Port on MJK's ML TQWT? I seem to remember this being asked and answered a while back, but I just can't find it with Search, so... Can I move the port on Martin King's FE164 ML TQWT design from the front to the rear with no other changes? __________________ Aerodynamics are for people who can't build engines. Enzo Ferrari

27th May 2003, 04:30 AM	#3
leadbelly diyAudio Member Join Date: Dec 2002 Location: Calgary, Alberta	Thanks Dave, I prefer the aesthetics of port in the back myself. Does the base slab weight or density have a significant impact on sound? I haven't cut pieces yet, and can cut them out of either 1" or 3/4" MDF, or even other things like cheap pine or cheap plywood if acceptable. __________________ Aerodynamics are for people who can't build engines. Enzo Ferrari

27th May 2003, 09:02 AM	#4
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 5	Mostly building out of plywood these days, and the speakers tend to be tall, skinny, & top-heavy (where the drivers are). So the prime purpose of the base is to get a little wider footprint. Using something with some mass is also useful in helping them from tipping. With the bipoles we build, rocking from the speaker moving in and out is not an issue, but it could be with a box with front firing only speakers. Aesthetically we like the base offset from the speakers with copper pipe, so when we need it we put the port on the bottom. dave __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

27th May 2003, 07:51 PM	#8
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	It's down to taste, some people like it direct, (front), some like it diffuse, (rear). A rear port can also minimise the chuffing sound of a box or port worked too hard. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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27th May 2003, 10:18 AM	#5
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	is there any difference in sound quality between a front port and a back port? (not only for TL ports, BR too)

27th May 2003, 07:46 PM	#7
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	and with no HF garbage, is there any difference in sound quality?

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