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Multi-Way Conventional loudspeakers with crossovers

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Old 29th July 2008, 10:07 PM   #11
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somebody can describe the listen results of this speakers ?

is there good bass ? how is the midrange ?

thanks !
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Old 30th July 2008, 12:17 AM   #12
peter_m is offline peter_m  Canada
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Andy Graddon,
do you have more details on you speaker build? Is it a TransLam?

kaiser38,
you can make the SR-71 into a floor stander as long as you don't modify the width of the cabinet. No need to modify the x-over as long as you don't change the cabinet width and don't change the driver location on he baffle. As for internal volume, you will need to put a barrier to reduce the internal volume back to the 14L of the original design. From what I understood, 14L was basically the available volume of the Madisound enclosures and Zaph might have hinted he would have preferred slightly larger volume at 16L but that is splitting hairs.

From what I've read it's a great sounding speaker. Just might build a pair some day.

Peter

Edit: http://htguide.com/forum/showpost.ph...1&postcount=89
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Old 30th July 2008, 03:59 AM   #13
Jay_WJ is offline Jay_WJ  United States
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Actually, "you can freely change the baffle height---simply keep the width as specified" is sort of a general guideline because it doesn't make a big difference in general. But the fact is, not only baffle width but also height affects baffle step. In the case of SR71, a tall baffle should make a noticeable difference because the original design has already incorporated real "full" baffle step compensation. This is shown in the following sim result in my web page:

Effect of tall baffle on ER18RNX 2-way response

My crossover is not "very different" from Zaph's. Mine just has a little bit (1 dB) less BSC, and a little lower (1.55 vs 1.75 kHz) xover point than his.

If you're interested, here's a review from a Polish person who used my crossover for his build (27TBFC/G version):

SEAS ER18RNX / 27TBFCG MT 2-way: Listening impressions

He was very satisfied with the result.

-jAy
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Old 30th July 2008, 06:03 AM   #14
Andy G is offline Andy G  Australia
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Quote:
Originally posted by peter_m
Andy Graddon,
do you have more details on you speaker build? Is it a TransLam?
Yes its a translam, using solid "Jarrah" timber (from Western Australia). Built up using curved staves for the sides and some flat plank for the top an bottom. This is lined with 'caneite' (sugar cane board) then a layer of barium rubber, then foam, and some wadding. Very inert, and heavy !!!

The highlight is a 8mm layer of Tasmanian Oak.

The narrow back is actually 1" mdf (Jarrah is quite expensive and I didn't really want to use it for the back), and the detachable baffle is also 1" mdf.
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Old 30th July 2008, 09:05 AM   #15
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Hello,

Jay, I saw the curves on your website

Why do you down the xover point from 1750hz to 1550hz?

Could I use your BSC to compensate the height of the floorstanding, and keep the originaly xover point of John's design

A question, to make my cabinet :
Somebody have the exact width and size of the madisound cabinet in centimeters ?

Thanks,

PS : I don't understand the sentence in the xover plan on the zaph website. What does mean "this resistance is part of the inductor" ?
It means that I don't need to buy the R3 & R8 resistance (red color) ?

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Old 30th July 2008, 04:09 PM   #16
Jay_WJ is offline Jay_WJ  United States
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Quote:
Originally posted by kaiser38
Why do you down the xover point from 1750hz to 1550hz?
The answer is also in my web page.
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Old 30th July 2008, 08:21 PM   #17
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OK I saw !

I don't know what I'll do.

Now, I try to design the cabinet for my project.
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Old 30th July 2008, 09:59 PM   #18
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Quote:
Originally posted by Jay_WJ
Actually, "you can freely change the baffle height---simply keep the width as specified" is sort of a general guideline because it doesn't make a big difference in general. But the fact is, not only baffle width but also height affects baffle step. In the case of SR71, a tall baffle should make a noticeable difference because the original design has already incorporated real "full" baffle step compensation.
I agree. From a previous experience with Ellis 1801b, standed and floorstanded (same drivers location, same width, same internal shape and volume, only the baffle was prolongated under the woofer), listening results were quite different.
Edit: the b version of the ellis also used a big (full?...)BSC filter.
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Old 31st July 2008, 09:46 AM   #19
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I would like to have the opinion of john about the really diffence between the kit with MD14 enclosure and floorstanding cabinet.

In his website, we can read this : ".
Quote:
You may be able to build a floorstanding version of a stand mounted system, provided the width and driver positioning relative to the top and sides is close to the original. In this situation, there will only be about one dB of variation in the frequency response
Lastly, Do you think that the depth of the enclosure are important or not ?
The internal depth of the MD14 enclosure is 8.75", I would reduce this to 8" (less 3/4")

If it's a problem, I won't do this !


thanks !
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Old 31st July 2008, 10:48 AM   #20
sreten is offline sreten  United Kingdom
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Hi,

FWIW you should use all the information available to you.

i.e. that from Zaph and WJ.

The crossovers are barely different and WJ extends Zaphs options.

A floorstander will afffect BSC which can be ameliorated by making
it somewhat narrower, but more likely choose a c/o option for this.

The floorstander does not have to be 14L. Around 17L is optimum
and basically 14L to 20L will all work with the same dimensioned
port, which will adjust automatically for the different cases.
The larger sizes, 17L to 20L will give drier but more extended bass.

As the cabinet size is not large for a floorstander :

Consider reducing hieght and an angled baffle to point the
tweeter towards ear hieght at the normal listening distance.

Consider a closed off section in the base to be filled with sand.
This could also house the crossover.

/sreten.
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