The more insightful approach is choosing the drivers, their position in space
and the crossover net .
As the crossover is very importatnt, it's the real heart of the LS, and often behind an easy design (by the outside) you'll see a complex work .
So instead of buying drivers only...buy coils and caps .
Also resistors ...
and the crossover net .
As the crossover is very importatnt, it's the real heart of the LS, and often behind an easy design (by the outside) you'll see a complex work .
So instead of buying drivers only...buy coils and caps .
Also resistors ...
It is an unconventional approach but not unique. When using an inexpensive speaker like the SB mid-woofer there may be variations in response that are not represented on a chart. Using speakers with different inherent characteristics tends to minimize and smooth any resonances or nuances. For $30 a piece for the Silver Flutes, I can put them in a vented box for another project if they don't work out. Not a big deal.
I don't have the crossover points 'figured out' they are only generalized as one can tell by the ~. That's a reasonable approach.
Not saying this will be the final design, it is an experiment. A lot of the final design will be empirical using test equipment to quantify the results.
You said, "...Your plan is completely flawed from the start..."
I don't believe that what you have pointed out substantiates that assertion.
I've looked at the design I mentioned -AR 10 p revisited- and both the original woofer and the (new) 10" have a resistor before the crossover net
guess... the choice of a high Qm speaker that permits to adapt the response
in this case also a resistance in parallel helps in lowering (Qt ...? ) and the relative highpass with the 5-10 l enclosure, ok it's not very clear
So I would look toward the Pro department.
And choose the dome mid and tw.
The (sub) woofer already has a chamber .
Try what happens with a resistance in series .
guess... the choice of a high Qm speaker that permits to adapt the response
in this case also a resistance in parallel helps in lowering (Qt ...? ) and the relative highpass with the 5-10 l enclosure, ok it's not very clear
So I would look toward the Pro department.
And choose the dome mid and tw.
The (sub) woofer already has a chamber .
Try what happens with a resistance in series .
The basic plan was inspired by the AR LST design. I heard a pair of these at an AR exhibition around 1975 or so and they sounded incredible.
I chose the SB 12" woofer because it looked good on paper and fit really well with a sealed box design. The SB 12" woofers don't stay clean very much past 300 ~ 400 hz and I very much want to use dome midranges because a good dome midrange has very good presence and off axis response.
The Morel dome midranges don't go down to 400 hz well so I suspect I will need something to fill in that hole. The SB mid-woofers should do that.
Silk dome tweeters are smooth and pleasant, again with good off axis response.
The LST crossed over at 5khz too so nothing unusual about doing that.
Thanks for the suggestion, I may get a few more caps to speed things along.So instead of buying drivers only...buy coils and caps .
Also resistors ...
I have a bunch of resistors and high end caps and will wind my own coils as I have a Sencore inductance analyzer.
the multi tweeter arrangement is seldom viewed, and those cases are by people who really didn't understand what they were doing
The mids and tweeters are going to be at ear height, thats the plan anyhow.
Check out the pics with the grill cover off.
Vintage Acoustic Research AR LST Speaker in Immaculate Condition | eBay
Each design is ...peculiar !?!
The chamber has wrong dimensions, as the near panel is too reflective.
So if you stuff it and try with a 1-2Ω resistor you should raise or lower some factor
Try with 3rd order. I see that Le of the SB woofer is 1.2 mH, so it must be calculated as part of the filter
So about 5-6 mH and 2.5 mH for a start ...some 100 uF caps...
The chamber has wrong dimensions, as the near panel is too reflective.
So if you stuff it and try with a 1-2Ω resistor you should raise or lower some factor
Try with 3rd order. I see that Le of the SB woofer is 1.2 mH, so it must be calculated as part of the filter
So about 5-6 mH and 2.5 mH for a start ...some 100 uF caps...
Are you suggesting the 10" mid woofer with a parallel resistor in place of the 12"?
Yes a resistor would definitely lower the Q.
That said, I prefer to have the speakers inherent characteristics define the response rather than trying to electrically alter it to try and make it work outside it's frequency range.
Bose was great at that but I never liked them.
As a previous owner of a pair of Allison Four
I'm a little biased towards Allison's approach
Allison designed the AR LST too.
I owned a pair of AR 3a's.
But...nowadays you don't see them often.
My steps into DIY happened when a tweeter of the Allisons departed.
I acquired a pair of Infinity RS 4000, then another tweeter departed
(bad distortion from clipping ).
But that happened after I blew the midranges when I played them fullrange
So first lesson learned ....Then I replaced all the drivers -after the foam died-
and so on .
Guess... today I was listening with Canton bookshelves
From you tube
So I'm not in the mood for multi-multi-multi way
Just some honest, 'present' sound
My steps into DIY happened when a tweeter of the Allisons departed.
I acquired a pair of Infinity RS 4000, then another tweeter departed
(bad distortion from clipping ).
But that happened after I blew the midranges when I played them fullrange
So first lesson learned ....Then I replaced all the drivers -after the foam died-
and so on .
Guess... today I was listening with Canton bookshelves
From you tube
So I'm not in the mood for multi-multi-multi way
Just some honest, 'present' sound
Nothing wrong with that. I'm currently using the SB woofers with a pair of reworked AR 18's with Vifa silk dome tweeters in them.
I see Mark Levinson was inspired by the LST and made these multiple mid-high freq driver systems. They cross at the near the exact frequencies that the LST does.
Cello Grand Master Speakers - Cello Technologies Seattle
I see Mark Levinson was inspired by the LST and made these multiple mid-high freq driver systems. They cross at the near the exact frequencies that the LST does.
Cello Grand Master Speakers - Cello Technologies Seattle
probably great woofer
and most likely need a very big closed box
new SB Satori tweeter looks great too
only missing a good midrange
probably great woofer
and most likely need a very big closed box
new SB Satori tweeter looks great too
only missing a good midrange
The SB 12" needs about 4.5 cu.ft for a sealed box. So far I am quite happy with their low end response.
I have another SB 12" in a box that I did not post that is stuffed and all.
Having fun experimenting with this stuff in my semi-retirement.
Have you seen the Satori mid-woofer? It looks like it can handle up to ~2khz, likely high enough to cross a Satori tweeter but no published distortion spec charts.
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