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Old 12th November 2002, 03:21 AM   #1
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Default Martin King's Lowthers

Martin has just posted the initial stage of his Lowther project. Includes measurements of T/S and FR of DX2, DX3, & DX4 models.

http://www.quarter-wave.com/Project04/Project04.html

It will be really interesting to see how this project turns out.

dave
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Old 12th November 2002, 03:36 AM   #2
BrianGT is offline BrianGT  United States
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Man, those are expensive driver...

from http://www.lowther-america.com/
DX series
DX2 $695
DX3 $795
DX4 $1700

It will be interesting to see the results. The initial driver measurements look good. It is strange how having the drivers slightly off axis makes them almost perfectly flat.

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Brian
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Old 12th November 2002, 06:21 AM   #3
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Default Martin has just posted the initial stage of his Lowther project

I guess we should call him Martin Lowther King then.


Please don't PUNish me,
Fred
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Old 12th November 2002, 06:41 AM   #4
halojoy is offline halojoy  Sweden
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Default Re: Martin has just posted the initial stage of his Lowther project

Quote:
Originally posted by Fred Dieckmann
I guess we should call him Martin Lowther King then.
Precise my thought.
Now I do not have to write it.
Thanks Mr Dickman
---------------------------------------------

A question:
What happens if I put a Lowther in a normal sealed enclosure?
Why did it have to be horn?
Will I be spitted on, if I do?
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Old 12th November 2002, 09:20 AM   #5
peterr is offline peterr  Netherlands
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I wish Martin good luck with his project.
I owe a lot to Martin's TL simulation software. It enabled me to design my TLsub, and it works great.
I was wondering about his design philosophy with 200 watt SS as opposed to low wattage SEamps in order to be able to use passive correction. If you were to use ACTIVE correction would you not be able to have the best of both worlds?
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Old 12th November 2002, 09:25 AM   #6
halojoy is offline halojoy  Sweden
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Default I agree

That was my thinking also, when I read the project.
Use active filter, before the amplifier.
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Old 12th November 2002, 11:39 PM   #7
MJK is offline MJK  United States
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Thanks for the comments. I'll just add a couple of responses to some of the items above.

1) I think that Lowthers will work in a variety of enclosures, if you had a sub I think that a closed box would work well. I have a couple of new worksheets built around my quarter wave equations that will include internal acoustic filters and vibration absorbers so the enclosures I am planning on exploring will not necessarily be easily categorized.

2) Passive vs Active filtering, a couple of thoughts on why I am using passive. First I am not an amp designer or tweaker so putting an active circuit ahead of the amp is a little beyond my experience. Second, I would like my speakers to be self contained, they eventually will have to find new homes so they need to work in whatever system is available. Third, I am designing these speakers to work with a solid state amp so they will not be optimized for a tube amp. If I am using a solid state amp with the higher powers available I do not see any real disadvantage in using a passive set of filters.

3) Martin Lowther King? I guess I have been called worse. There are a whole group of guys that think the fibers move in a TL that are still calling me worse names.

OK, thats my take on things. Thanks again for the feedback.

Martin
www.quarter-wave.com
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Old 12th November 2002, 11:50 PM   #8
halojoy is offline halojoy  Sweden
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Quote:
Originally posted by MJK
Thanks for the comments. I'll just add a couple of responses to some of the items above.

2) Passive vs Active filtering, a couple of thoughts on why I am using passive. First I am not an amp designer or tweaker so putting an active circuit ahead of the amp is a little beyond my experience. Second, I would like my speakers to be self contained, they eventually will have to find new homes so they need to work in whatever system is available. Third, I am designing these speakers to work with a solid state amp so they will not be optimized for a tube amp. If I am using a solid state amp with the higher powers available I do not see any real disadvantage in using a passive set of filters.
Martin
www.quarter-wave.com
Yes, it became quite obvius to me just after my post.
To provide the speakers along with active filters for putting somewhere before the end-stage, would be a soution for the chosen few.
As a do-it-yourselfer, you can become blind for the practical reality.
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Old 13th November 2002, 01:34 AM   #9
MJK is offline MJK  United States
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Sorry, I am not sure I understand your post. I am afraid I am not real sharp and the point you were trying to make zipped right over my head. Could you help me out a little?

Thanks in advance,

Martin
www.quarter-wave.com
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Old 13th November 2002, 03:12 AM   #10
halojoy is offline halojoy  Sweden
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Quote:
Originally posted by MJK
I would like my speakers to be self contained, they eventually will have to find new homes so they need to work in whatever system is available.
Martin
www.quarter-wave.com
The above,
become obvious to me, right after I had written my post.
halojoy
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