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Tweeters to pair with Trusonic 15" speakers?

Here are, I'd opine, three reasonable Fostex choices (in order of increasing unreasonableness in terms of price):

http://www.madisound.com/catalog/product_info.php?products_id=286
http://www.madisound.com/catalog/product_info.php?products_id=290
http://www.madisound.com/catalog/product_info.php?products_id=295

Now, having said all of this, here are my favorite supertweeters. These are mid-1980s Radio Shack 40-1375 planar tweeters (copies or OEM versions of a much-respected JVC planar of the time). These are very sweet sounding and sensitive enough to use with Altec Valencias. My super-custom enclosures :-) (Hammond boxes) have 8-ohm PartsExpress L-pads and PartsExpress Dayton XO caps (1st order @ 10 kHz IIRC) and they are dandy to sweeten up the top-end of more or less vintage "full range" speakers. They're also not particularly hard to find (I found my drivers at the dump).

40-1375.jpg

openvalencia.jpg

PA070004.jpg



Unless you've heard the EV T-35 and you like it, I'd really recommend avoiding it like the plague :-P They are not extended and they're awfully harsh sounding. I say this as a person with about seven of them in the basement (but none of those is actually in use)!
 
mhardy6647...

so if you were me, and you had to choose between the CTS KSN 1141 piezo tweeter and the first Fostex you listed (most reasonable according to your list....Fostex FT17H), what would you choose?

-Brian
 
You would need to measure to see if your could get the in cabinet to work with the waveguide. As good as mine are sounding I would be hard pressed to vote for anything else, but that is just my opinion and these are the 150W's as opposed to the 150FR's. The FR's can be crossed over lower and made to sound quite nice. The question is of course how much work are you willing to put in to the building of said beasts. :D

My inside dimensions for the cut is 10 3/4 by 5 1/8 the measurement of the outside is 12 by 6 1/2.

Bill

Edit: I thought Jackgiff had tried this before and here is his post on it in the Ewave thread.
 
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C'mon gang, y'all know the drill here:

What is a 150FR? A pseudo duplex thingy? What's "Free cone?"

How high do they play, and do they do it worth a whit?

Can somebody link to the specs?

How big is the tweeter cutout?

Does it have to be recessed?

Do we guess that duct is optimum for this driver and cab volume?

The front baffle is apparently removable, and if so, can be reconfigured as required to make something of these, once the parameters are known.

Those certainly look like Barzilay cabs to me; a half-dozen or so VERY nice eWaves have already been built in them, if so.... :yes:
 
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Zilch said:
C'mon gang, y'all know the drill here:

What is a 150FR? A pseudo duplex thingy? What's "Free cone?"

How high do they play, and do they do it worth a whit?

How big is the tweeter cutout?

Does it have to be recessed?

Do we guess that duct is optimum for this driver and cab volume?

The front baffle is apparently removable, and if so, can be reconfigured as required to make something of these, once the parameters are known.
Click to expand...

I am VERY new to the DIY speaker club. So all the things you mentioned above.... like "What is a 150FR? A pseudo duplex thingy? What's "Free cone?""... I am not sure what that means exactly. Where those marketing ploys from back-in-the-day? Is the FR model not so great?

How do I figure out of the duct is optimum?

Would it be worth it to actually measure these things... figure out the cubic feet and measure the tweeter cutout?

Would there be a big difference between doing what you described above or just getting some tweeter/horns w/ properly matched XO's? Should I take the front baffles off?

Remember.. i'm a complete novice! Thanks again for the help!
 
I am appealing to others to come up with the requisite info for your project. There are members here well familiar with TruSonics.

You can certainly answer the question as to whether the front baffles are removable (it appears so,) and the size of the space available for a tweeter.

The larger question is whether augmenting what's there with a tweeter crossed at 3, 5, or 10 kHz is the appropriate approach, even.

Did you find anything relevant in a search of this forum?

Yes, we'd know more if you disassembled one of these and posted pics of the front of the woofer.... :yes:


Edit:

Bsujeep has found many of the answers, including the frequency response of that woofer as measured by Jackgiff:

bsujeep said:
Edit: I thought Jackgiff had tried this before and here is his post on it in the Ewave thread.
Click to expand...

Send Jack a PM with a link to this thread asking him to advise.... :yes:
 
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Hey Zilch.......

yeah, I know you are appealing to the others... but i think you need to dumb it down for me :) I'm totally fidning tons of info here... and, of course, some of it is over my head. I have some reading to do!

This weekend, I'll pull (try to pull) the fronts off, take pics, get some inside dimensions and post 'em. Maybe that will help you, help me, figure out what to do with these things! :)

Seriously..... thanks for all the help and info!

-Brian
 
The baffle removes from the rear, not the front, I believe you'll find.

The grilles are likely fragile; I wouldn't mess with those 'til someone here familiar with them tells us how they might be removed without damage. Once the baffle is out, it may be apparent. Dad maybe remembers, as well.... :thmbsp:
 
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Forgive me if I misremember what your first posts said since I read them a while back, but it seems to me that you got the speakers from your father who put them together. I'm curious why you are sure that they would be better with a port or a duct -- presumably your father chose not to use one for some reason. So maybe it would make sense to start by getting used to the speakers and see if they actually do need a different bass alighnment
Incidentally, I think the free cone refers to the cone being a high compliance design, which might possibly suggest that a sealed box would be a good option.
As to your interest in extending the high end, that makes sense to me. A 15 inch driver is unlikely to have all that much extension into the high end, and dispersion will be fairly limited. So I would guess that you'd want a high frequency driver that goes relatively low and is quite efficient. Horn tweeters would be a fairly obvious choice, and vintage appropriate too, and if you don't want to do much woodworking, you can always mount the horn on top, perhaps in a nice looking housing if appearence is an important consideration. The econowave option might be a good one -- not cheap as dirt, but I'm guessing that it would come in under your price limit.
JBL 075s might work too, and in the cabinet easily. PM me if that option is of interest.
 
Zilch said:
The baffle removes from the rear, not the front, I believe you'll find.

The grilles are likely fragile; I wouldn't mess with those 'til someone here familiar with them tells us how they might be removed without damage. Once the baffle is out, it may be apparent. Dad maybe remembers, as well.... :thmbsp:
Click to expand...

HAHAHAHA.... see... told you that you need to dumb it down for me ;) (where is the embarrassed emoticon?) :stupid:

Yes.. those baffles are just sitting in there and I can remove them easy peasy. :)
 
Nat said:
Forgive me if I misremember what your first posts said since I read them a while back, but it seems to me that you got the speakers from your father who put them together. I'm curious why you are sure that they would be better with a port or a duct -- presumably your father chose not to use one for some reason. So maybe it would make sense to start by getting used to the speakers and see if they actually do need a different bass alighnment
Incidentally, I think the free cone refers to the cone being a high compliance design, which might possibly suggest that a sealed box would be a good option.
As to your interest in extending the high end, that makes sense to me. A 15 inch driver is unlikely to have all that much extension into the high end, and dispersion will be fairly limited. So I would guess that you'd want a high frequency driver that goes relatively low and is quite efficient. Horn tweeters would be a fairly obvious choice, and vintage appropriate too, and if you don't want to do much woodworking, you can always mount the horn on top, perhaps in a nice looking housing if appearence is an important consideration. The econowave option might be a good one -- not cheap as dirt, but I'm guessing that it would come in under your price limit.
JBL 075s might work too, and in the cabinet easily. PM me if that option is of interest.
Click to expand...

Hey Nat! Thanks for the reply!

So the story is..... my father in law built these cabinets for his father in law (wife's grandfather). The grandfather (Gordon, a SUPER cool guy) passed away several years ago and his wife didn't want the stereo equipment. I got these speakers w/ an amp and an old reel to reel. My father in law visited several months ago and said that he remembers building these cabinets w/ Gordon. They researched the speakers and bought the cabinets as a kit and put them together. My father in law said that Gorden was suppose to have upgraded in future and put tweeters in there... but never did.

I didn't ask him about the baffling, and why it was a tube and anything toooo specific about the choices made when building it. Aesthetics is somewhat important, which is why a large horn on top isn't my first choice. So, here I am with some 1/2 way decent speakers and relatively pleasant looking cabinets that I would love to sound nice. Plus, it gives me an excuse to upgrade my components ;)

But again.. I kinda don't know what I am doing.
 
OOPS -- forgot to renew my membership...
Oh the shame of the instantly overfilled message box! But all taken care of now. Hadn't realized that the renewal message isn't about a distant future, but is instead about the next day or two.
 
I think they are cool. If the price doesn't get bid up to crazy levels, they'd certainly bring all kinds of autheticity to your project.
 
I'm totally asking you Zilch! (I'm asking everybody). You guys (gals?) know way more than I do.

Okay, I got some time to get some measurements. These are all inside dimensions.

24 1/2"H x 22 1/2"W x 15" D. The baffle (that's the open hole for the air.... right?) is 5" DIA. The Tube that slides in is 14" Long. The cutout for the tweeter square is 10"W x 4"H.

The 15" Trusonic is about 8" deep +/- a 1/4" or so.

What do you guys think?

1) Given these dimensions, which is the best way to proceed?

2) Do you think those trusonic tweeters listed on ebay are worth it? I was looking at the brochures that were posted. Granted, they are from the 50's-70's, the brochure said one could pair those tweeters w/ the 150FR's. I wonder what it would sound like?

3) Should I still consider other options that were thrown out?

Zilch, I know you are suggesting the e-wave thing, is there really a way to fit an e-wave solution inside this cabinet? Do you have any links to anyone who has modified a similar cabinet for into an e-wave?

Thanks again for all the help!
 
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