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post #31 of 253 Old 12-15-2011, 02:10 PM - Thread Starter
 
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I'm opening up the back for the crossover recess.







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post #32 of 253 Old 12-15-2011, 02:21 PM
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Quote:
Originally Posted by Dusty Shopfloor View Post

BeerParty--Chris, I'd really like to see these in a curved cabinet and I really don't think it will be much extra effort.

I should have some time to spend with Sketch-up next week, so I'll draw up my vision and post it for all to see. I'll need some feedback from the design gurus here to see if my design will fly or not.

Chris

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post #33 of 253 Old 12-15-2011, 02:29 PM
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Quote:
Originally Posted by Dusty Shopfloor View Post

tuxedocivic--I'm not sure if Curt has had a chance to update his measurements and conclusions yet, but he might if he gets the chance. The price for these makes them worth a try. And if they disappoint, there's always another build ahead, right? Yeah, that's what I'm talking about!

Oh, absolutely. Dirt cheap. I was taking a look thinking "hmm, my current build does all that in a smaller package". Then I realized it's almost half the price Pretty good value. Curt's an established designer. I'm sure the write up just needs some finishing touches.
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post #34 of 253 Old 12-15-2011, 03:13 PM
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Quote:
Originally Posted by LTD02 View Post

i don't understand how all these frequency responses are the same speaker.

http://speakerdesignworks.com/NS6project_5.html

Trust me, they all the same speaker, but measured using different methods, and/or a different design axis.

Picture 1 (the 1/3 octave smoothed one)

This was measured later in the design process with the mic about 10 degrees off orthogonal with respect to the baffle, and centered between the tweeter and the lower woofer. I don't recall if I used a sweep or MLS for this plot.

Picture 2

Early in the design process where I was verifying the crossover frequencies and power response. The difference is due to a slightly different crossover, and the fact it was measured on the tweeter axis orthogonal to the baffle. The key piece of information here is not the absolute response, but the relatively small variation in response even off 60 degrees. If you look at a Stereophile measurement, they show the on axis response as 0, and show the off axis responses as changes from the nominal value. This then shows only the difference in response, and results in a much nicer looking plot. Yes, the little Vifa tweeter has a bump on axis, but as you can see, it behaves much better when measured off axis. Sure, from a purest sense, it is not an audiophile design. -But then it was never intended to be.

Picture 3

This was measured using stepped sine waves at 1/12 octave spacing. Due to the difference in measurements format, it will not necessarily look like an MLS or swept sine measurement, as the excitation frequencies may, on may not coincide with the response variations of the driver under test.

Measurements are not, and never will be the panacea we would like them to be. The results are all too often dependent on the measurement conditions and methods under which they were obtained.

Quote:
Originally Posted by tuxedocivic View Post

It is strange, but Curt says right on the page he had a hard time measuring this speaker. Still funny that most of the anomolies between measurements are in the upper frequencies, where getting a reliable measurement shouldn't be hard.

I'm confused by some of the things said on his write up. He says the speaker is 92 to 94db/2.83V sens, and that 20watts yields 109db. That would take at least 32 watts??? I would think Curt can do math better than that. It's also a 4ohm speaker, so that further adds to 20 watts NOT netting 109db. Hmm.

He also says the sensitivity is approaching pro audio... I'm not so sure. Approaching I suppose, but still a ways off the mark.

Cool design anyways, and cheap too! Look forward to watching the build!

The USPL of the Aura driver is 90 dB/2.83volts/meter. Three sets in parallel will increase that sensitivity by approximately 9.5 dB. Depending on how close they are placed to the front wall determines their ultimate sensitivity. I intentionally conservatively rated their basic sensitivity, but modeled the drivers in CAD to determine their max SPL.

-I never was any good at math

C
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post #35 of 253 Old 12-15-2011, 04:29 PM - Thread Starter
 
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There you have it from the Designer himself.
Thanks for stopping by, Curt.
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post #36 of 253 Old 12-15-2011, 04:57 PM
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Thanks Curt!
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post #37 of 253 Old 12-15-2011, 07:20 PM
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I have to thank my friend James, (exojam) for pointing this thread out to me. I don't seem to have much free time for the forums these days, but my email is always open...

I look forward to hearing your impressions of them, and do hope you find them acceptable.

C
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post #38 of 253 Old 12-15-2011, 10:02 PM
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Cant wait to see what you think of these bad boys.
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post #39 of 253 Old 12-16-2011, 03:37 AM - Thread Starter
 
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Last night I happened across a thread at HTG where a guy (clubby) did a real nice Sketchup of the Stentorians. It's in post #30 and it's worth a look.
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post #40 of 253 Old 12-16-2011, 03:49 AM - Thread Starter
 
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I goofed and cut the brace for the MTM portion of the cabinet too short. Easy to fix.

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post #41 of 253 Old 12-16-2011, 06:04 AM
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I have to give the Sten's the absolute value build of all time. Madisound has the kit for $240 for both speakers.

An audiophile likes to talk about how much they spent and how good it sounds.

A DIY'er likes to talk about how little they spent and how good it sounds.

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post #42 of 253 Old 12-16-2011, 06:35 AM - Thread Starter
 
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Quote:
Originally Posted by Jinjuku View Post

I have to give the Sten's the absolute value build of all time. Madisound has the kit for $240 for both speakers.

Link?

I found the MTM version (the Sten II) at Mad for $139, but I didn't see the full Stentorians at Mad. I'm sure I just didn't look in the right place.
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post #43 of 253 Old 12-16-2011, 07:06 AM
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Here is a link to PE where you can add everything needed at once to your cart (for 2 speakers). Total is 182.34, but one resistor is on back order.

Link did not work but if you go to the speakers projects and find the Stentorians, you can add everything to the cart with one click.

James
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post #44 of 253 Old 12-16-2011, 07:22 AM
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Quote:
Originally Posted by Jinjuku View Post

I have to give the Sten's the absolute value build of all time. Madisound has the kit for $240 for both speakers.

Quote:
Originally Posted by Dusty Shopfloor View Post

Link?

I found the MTM version (the Sten II) at Mad for $139, but I didn't see the full Stentorians at Mad. I'm sure I just didn't look in the right place.

If you go to the Madisound page for the MTM version, there is a pull down box under 'Kit Package'. The Stentorian kit is the second option in the pull down list. Select it and the price will update.

Chris

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--Despair, Inc. "Regret"

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post #45 of 253 Old 12-16-2011, 07:26 AM
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Quote:
Originally Posted by exojam View Post

Here is a link to PE where you can add everything needed at once to your cart (for 2 speakers). Total is 182.34, but one resistor is on back order.

Link did not work but if you go to the speakers projects and find the Stentorians, you can add everything to the cart with one click.

James

Link: http://stories.parts-express.com/sto...9/redirect.htm. The "add all parts" button is at the bottom of the page.

Chris

"It hurts to admit when you make mistakes - but when they are big enough, the pain only lasts a second."
--Despair, Inc. "Regret"

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post #46 of 253 Old 12-16-2011, 09:13 AM - Thread Starter
 
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Thanks for the links, guys.




Dry fit check.




I joined a front to a side and used some brads to keep things aligned during clamping.





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post #47 of 253 Old 12-16-2011, 09:16 AM
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Thanks for the fix Chris.

PI, you just kill me with this stuff. Less than 2 days and you are clamping

James
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post #48 of 253 Old 12-16-2011, 09:27 AM
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Quote:
Originally Posted by exojam View Post

PI, you just kill me with this stuff. Less than 2 days and you are clamping

James

Santa's got the pressure on me for this build.
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post #49 of 253 Old 12-16-2011, 11:32 AM - Thread Starter
 
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Thankfully, I was never in danger of running out of clamps.



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post #50 of 253 Old 12-16-2011, 12:49 PM - Thread Starter
 
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Woo-hoo! PE delivered already!

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post #51 of 253 Old 12-16-2011, 01:28 PM
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You can never ever have enough clamps...

C
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post #52 of 253 Old 12-16-2011, 01:50 PM
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So how is it you do 10x as much woodwork as I do, yet your shop is 10x as clean / organized? Hmm, maybe there's a lesson there...
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post #53 of 253 Old 12-16-2011, 02:32 PM
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Dusty, your shop/garage is like... Porno, I think...
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post #54 of 253 Old 12-16-2011, 02:46 PM
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Quote:
Originally Posted by Brad Horstkotte View Post

So how is it you do 10x as much woodwork as I do, yet your shop is 10x as clean / organized? Hmm, maybe there's a lesson there...

He once told me it takes 3 hours to take each picture because he has to clean up all the clutter before framing the shot!


Uhhhh, did anyone else see the hinged cabinet full of clamps?

Mr. Dusty Shopfloor, what date do these cabinets have to be done by?
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post #55 of 253 Old 12-16-2011, 05:15 PM - Thread Starter
 
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Erich knows me so well!

I have to deliver them by Christmas Eve at the latest. Sooner is better. These are a secret surprise Christmas gift that a good friend will give to her son.
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post #56 of 253 Old 12-16-2011, 06:07 PM
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re #34:

great to see your reply curt. props for weighing in.

if i might push back a little on this design...won't that tweet get blown out by most folks in pro audio applications? seems like the week link in the chain.

Listen. It's All Good.
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post #57 of 253 Old 12-16-2011, 07:49 PM
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Quote:
Originally Posted by Dusty Shopfloor View Post

tuxedocivic--I'm not sure if Curt has had a chance to update his measurements and conclusions yet, but he might if he gets the chance. The price for these makes them worth a try. And if they disappoint, there's always another build ahead, right? Yeah, that's what I'm talking about!

Edit: Okay, I shouldn't have been flippant in my reply. I guess I was tired. The fact is, I am fully confident that these babies will impress, or I wouldn't waste my time building them.

It is your thread and your build, you can be flippant if you want to!

Chris

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--Despair, Inc. "Regret"

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post #58 of 253 Old 12-16-2011, 07:51 PM
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Quote:
Originally Posted by Dusty Shopfloor View Post

Thankfully, I was never in danger of running out of clamps.

Show off!

( See? I can be flippant too! )

Chris

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--Despair, Inc. "Regret"

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post #59 of 253 Old 12-16-2011, 08:35 PM
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Quote:
Originally Posted by Erich H View Post

Uhhhh, did anyone else see the hinged cabinet full of clamps?

At first, I scrolled down and though "Hey, he reloaded that shelf with bar clamps", but then I saw the hinge..

YID DIY
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post #60 of 253 Old 12-17-2011, 05:14 AM
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Quote:
Originally Posted by LTD02 View Post

re #34:

great to see your reply curt. props for weighing in.

if i might push back a little on this design...won't that tweet get blown out by most folks in pro audio applications? seems like the week link in the chain.

I was thinking the same thing. Wouldn't a CD be a better choice for HT?

Dumb enough to spend lots of cash on this junk!
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