Anyone built Linkwitz PMT1 or PMTM1?

MtnBob · 31st March 2005, 01:26 AM

I'm thinking about these designs, but there are a couple of questions.
Does the brace on the rear serve a purpose acoustically, or is it just a brace?
The drawing shows some stuffing, I believe, but how dense?
TIA

MB

Davey · 1st April 2005, 04:24 AM

The brace holds the drivers in the baffle since they mount from the rear with no mechanical fasteners. With the weatherstripping lining the mounting rebates and the RTV between the brace and magnets there is no "hard" mounting of any kind. You could mount the drivers conventionally (from the front) if you wanted to simplify the construction a bit.

You don't really need any stuffing.

Cheers,

Davey.

MtnBob · 4th April 2005, 03:13 AM

Thanks, I went back and saw that I needed to go to the Pheonix page for the mounting details.

MB

pelanj · 2nd November 2008, 10:02 PM

Bringing this topic up again

Has anyone built PMT1? I am slowly getting to make something similar...but wery slowly

And I will have to use another drivers as well. Are there some Monacor or Visaton alternatives to the drivers? These two brands I can get locally.

gainphile · 3rd November 2008, 12:44 PM

Having done a few OBs and slowly learning their characteristics, I think this design would seriously lacks Bass.

Davey · 3rd November 2008, 12:54 PM

There's a woofer that's designed to go with it. The PMT1 was never intended to reproduce bass.

http://www.linkwitzlab.com/proto.htm#PW1

The only person I'm aware of that has built the PMT1's is Bruce Coppola. Google his name and you'll find some photos.

Dave.

pelanj · 3rd November 2008, 03:22 PM

I am not afraid of lack of bass, I listen usually at very low levels and I plan a subwoofer (dipole? Or even some cheap one

) at a later time - I plan to use these more or less as satellites. I have found some rough and cheap alternatives from TVM, at the same time I am going to try two different tweeters (I have already one pair at home) at one baffle (cone-dome - not at the same time).

I saw Bruce's speakers yesterday - and that finally forced me to dig deeper into this project.

31st March 2005, 01:26 AM	#1
MtnBob diyAudio Member Join Date: Dec 2003 Location: 8800 ft above sea level	Anyone built Linkwitz PMT1 or PMTM1? I'm thinking about these designs, but there are a couple of questions. Does the brace on the rear serve a purpose acoustically, or is it just a brace? The drawing shows some stuffing, I believe, but how dense? TIA MB __________________ "Whenever you find you are on the side of the majority, it is time to pause and reflect." Mark Twain

4th April 2005, 03:13 AM	#3
MtnBob diyAudio Member Join Date: Dec 2003 Location: 8800 ft above sea level	Thanks, I went back and saw that I needed to go to the Pheonix page for the mounting details. MB __________________ "Whenever you find you are on the side of the majority, it is time to pause and reflect." Mark Twain

3rd November 2008, 12:44 PM	#5
gainphile diyAudio Member Join Date: Dec 2007 Location: Melbourne the sunny city!	Having done a few OBs and slowly learning their characteristics, I think this design would seriously lacks Bass. __________________ http://gainphile.blogspot.com

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1st April 2005, 04:24 AM	#2
Davey diyAudio Member Join Date: Dec 2001 Location: Bremerton, WA.	The brace holds the drivers in the baffle since they mount from the rear with no mechanical fasteners. With the weatherstripping lining the mounting rebates and the RTV between the brace and magnets there is no "hard" mounting of any kind. You could mount the drivers conventionally (from the front) if you wanted to simplify the construction a bit. You don't really need any stuffing. Cheers, Davey.

2nd November 2008, 10:02 PM	#4
pelanj diyAudio Member Join Date: Jul 2008	Bringing this topic up again Has anyone built PMT1? I am slowly getting to make something similar...but wery slowly And I will have to use another drivers as well. Are there some Monacor or Visaton alternatives to the drivers? These two brands I can get locally.

3rd November 2008, 12:54 PM	#6
Davey diyAudio Member Join Date: Dec 2001 Location: Bremerton, WA.	There's a woofer that's designed to go with it. The PMT1 was never intended to reproduce bass. http://www.linkwitzlab.com/proto.htm#PW1 The only person I'm aware of that has built the PMT1's is Bruce Coppola. Google his name and you'll find some photos. Dave.

3rd November 2008, 03:22 PM	#7
pelanj diyAudio Member Join Date: Jul 2008	I am not afraid of lack of bass, I listen usually at very low levels and I plan a subwoofer (dipole? Or even some cheap one ) at a later time - I plan to use these more or less as satellites. I have found some rough and cheap alternatives from TVM, at the same time I am going to try two different tweeters (I have already one pair at home) at one baffle (cone-dome - not at the same time). I saw Bruce's speakers yesterday - and that finally forced me to dig deeper into this project.

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