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Stephens Trusonic 120cx speakers - Best type of enclosure design?
Stephens Trusonic 120cx speakers - Best type of enclosure design?
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Old 29th July 2019, 12:58 AM   #11
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Quote:
Originally Posted by bentoronto View Post
+1 although I thought my plain-language description was all that was needed. Not logical to "design for" as GM suggests than simply to make biggest box that's feasible and get the most you can.
You didn't define 'largish'. Relative to what? Many folks here think 5 ft^3 is unacceptably large whereas this was pretty small for us folks that grew up with speakers 2-6x larger, hence my very 'logical' response.

But all this is irrelevant since the OP has some specific alignments in mind, so, smart guy, design him an Onken, BLH, Karlson or any other technically optimized cab he may show interest in using your way.

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Old 29th July 2019, 01:08 AM   #12
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Originally Posted by vishalk View Post
This was interesting, bet in Japan they've built some good enclosures for these.
Having reverse engineered many Japanese alignments for local use [not worldwide] along with some others on various forums; overall, 'we' weren't impressed. Not surprising really when one considers typical local living space, construction, etc.. Pretty much what some of us refer to as 'girl and a guitar' type speaker.

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Old 29th July 2019, 04:09 AM   #13
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Stephens Trusonic 120cx speakers - Best type of enclosure design?
Quote:
Originally Posted by GM View Post
...But all this is irrelevant since the OP has some specific alignments in mind, so, smart guy, design him an Onken, BLH, Karlson or any other technically optimized cab he may show interest in using your way
Sealed boxes have no optimize* only maximize. The bigger the better. And better yet, is to make a largish box with lots of stuffing and leave the back off. I think the Stephens would like that.

I think an engineering analysis of such a box placed in a room a foot or two from the wall would challenge the capability of ordinary master's theses.

I'm not sure the beautiful high-tech trick tweeter would compare to a modern $30 silk dome. Dunno. Best to study how it (and tired old crossover components) perform.

Stephens has a glorious history originating - if I recall - with a Lansing break-away.

B.
*sim programs have Official Pronouncements of what's best for you in sealed boxes. My impression is the Official Pronouncement for sealed boxes will be a nonsense tiny box that is lousy in your room. Too bad it is forbidden to have insight into what criteria are being addressed by the sim or how that might relate to quality sound in your room. Don't the sim makers play their speakers in rooms?
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Last edited by bentoronto; 29th July 2019 at 04:15 AM.
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Old 29th July 2019, 07:44 AM   #14
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Ok guys seems like the best thing to do is get some results up here of the speakers. I'll put them in a simple baffle board and do some frequency sweep measurements.



I actually have some enclosure designed and made for some goodmans axiom 301 may just put them in there see how they respond.
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Old 10th August 2019, 08:02 PM   #15
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Default Trusonic TS measurements

ok guys i got some results in, i used the dayton dats software and dats v2 device with the added mass option to get some TS measurements. This is just the woofer, i disconnected the concentric tweeter.

trusonic.jpg

* This data was exported from the Dayton Audio Test System: DATS
*
* Piston Diameter = 279.4 mm
* f(s)= 41.72 Hz
* R(e)= 7.069 Ohms
* Z(max)= 78.34 Ohms
* Q(ms)= 5.938
* Q(es)= 0.5889
* Q(ts)= 0.5357
* V(as)= 295.3 liters (10.43 cubic feet)
* L(e)= 1.118 mH
* n(0)= 3.473 %
* SPL= 97.51 1W/1m
* M(ms)= 26.02 grams
* C(ms)= 0.559 mm/N
* BL= 9.048
* K(r)= 0.2046
* X(r)= 0.4097
* K(i)= 0.02258
* X(i)= 0.616
*
*
Please see attached txt file for further results.
Attached Files
File Type: txt trusonic.txt (11.9 KB, 1 views)
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Old 10th August 2019, 08:45 PM   #16
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Stephens Trusonic 120cx speakers - Best type of enclosure design?
Seems unlikely that the resonance is anywhere as high as 42 Hz (50% too high???) or the Bl as low as 9. Which would raise questions about the other measurements.

I like to do what might be called a sensitivity analysis where you bias the measurement in some way (say, adding some weight or using a precision weights to a weight measurement) and see if the new result is coherent.

I like to know lots about my tools, tend to be skeptical about the illusion of 3-decimal accuracy, and try to know when it matters or not.

B.
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Old 10th August 2019, 11:03 PM   #17
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Ben i don't know how accurate the results are, all i know is that is what has been measured by the said device.

But agreed i should try different weights and see how the results change, i think the next thing to do is get my mic and use REW to do some frequency response measurements.

I have some horn cabinets which were made for the goodmans axiom 301's, i am just going to install them and listen.

I even have a pair of goodans ARU 172's which i was planning to use in the future, thinking may use the goodmans recommended enclosure size of 7800cu.ins see how it sounds.
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Old 10th August 2019, 11:20 PM   #18
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How else can i do it? I can't find any information on cabinet designs, speaker parameters, recommended enclosure designs, easiest thing to do is just design some baffle speakers and use these as my midrange and tweeter which would be excellent.
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Old 10th August 2019, 11:52 PM   #19
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Quote:
Originally Posted by bentoronto View Post
Sealed boxes have no optimize* only maximize. The bigger the better.
Once again wrong and irrelevant based on vishalk's postings so far, there's more to consider than available box size in a complete speaker system and continuing to be totally off topic.

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Old 11th August 2019, 12:36 AM   #20
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Originally Posted by vishalk View Post
ok guys i got some results in
Hmm, these fall in line with other brand's driver's specs back in the days of wanting to make replacement drivers in other brand's cabs, so curious when these were made, but if these specs are after considerable [re] breaking in to loosen them up and them still warm, then probably fine.

Do need to measure both though. Note that it advertised 30 Hz Fs, yet measures 40+ many decades later, implying it's frozen up some, but back in the day Altec drivers tended to be 10+ Hz above advertised, so inclined to accept yours if the other measures within +/- 10% if the above criteria is met on both.

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