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Old 15th August 2010, 04:53 AM   #51
tb46 is offline tb46  United States
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Default Post #17

Hi jbell,

I tried your suggestion, and it defeats the purpose of that particular design by reintroducing the dip @ 160Hz. Increase S2, and you'll have to decrease S4-S5; anyway, your original design would be better for simplicity and low frequency extension.

As to the discussion about simulation v. reality: my simulation was derived from multiple iterations of the drawing, and in that particular case is about as close as I can get it. Don Snyder's drawings end up being tested builds that reflect the simulations well.

I have not had the time to look at your design from Posts #38/39/48, hope you'll get the dimensions finalized, it looks quite promising. It's amazing how many different wrinkles one can put on the same general design. :-)

Regards,
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Old 15th August 2010, 04:29 PM   #52
tb46 is offline tb46  United States
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Default Accurate simulation of singlesheet_2

Hi again,

After trying to reconcile the Hornresp Input w/ the drawing, and trying to draw what was there I'm at a bit of a loss. To get to a better simulation of what is actually being build I will need much better data, otherwise it's back to horseshoes and handgranates. :-)

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Old 15th August 2010, 11:20 PM   #53
jbell is online now jbell  United States
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Oliver:

I have issues translating what I draw to hornresp as well, it only makes sense that others have the same issue....

However the goal in this case was a dual taper TH with the main taper change at the upper back. My cell phone took a lousy pic the other day, so here is my layout with some additional dimensions called out.
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Old 16th August 2010, 12:38 AM   #54
jbell is online now jbell  United States
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yes it really does all get cut out of a single sheet....
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Old 16th August 2010, 12:44 AM   #55
freddi is offline freddi  United States
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re:jbell 1 sheet layout layout = kool ! - I luv 1-sheet speaker projects
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Old 16th August 2010, 08:04 PM   #56
jbell is online now jbell  United States
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Quote:
Originally Posted by freddi View Post
re:jbell 1 sheet layout layout = kool ! - I luv 1-sheet speaker projects
yep, so do I... And this one has the side benefit of having great looks. I'm thinking a PE square metal grill will complete the look.

Have to wait till the glue dries to know for sure what it sounds like. I glued up the 2nd side, so no tuning on this one, it is what it is. (gutsy or stupid -- don't know.)
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Old 16th August 2010, 09:55 PM   #57
tb46 is offline tb46  United States
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Default Hornresp for singlesheet2

Hi jbell,

Here is the first try at a Hornresp simulation from the box data you provided, your initial SPL curve is in grey.

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Old 16th August 2010, 10:56 PM   #58
jbell is online now jbell  United States
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Thanks oliver:
It'd be nice to be able to accurately sim this, as my initial 2.83v readings are AWESOME !!!!! I won't do any 28v readings until the glue has time to set for 24hours, so take this with a HUGE grain of salt, but still...... flat 105db from 50-120... no nasty dip at 160, smooth up through 200hz, and still 99db at 40hz.

I am in love.
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Old 17th August 2010, 01:01 AM   #59
jbell is online now jbell  United States
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If anyone wonders why I post readings this way -- it's so I'm consistent back to my first measurements. This way I always have an exact reference to what I've done before. I may not be 100% accurate in my measurements, but they are consistent from one sub measurement to the next.

I use sine waves, every 1hz, over grass outdoors, and then plot out the every 5hz increments. (no one really wants to see the readings for every 1 hz.) While I have smaart and other apps, I always come back to the same spl meter, volt meter, and sine waves.

There is a sharp narrow dip from 150-152hz down to about 100db, but other than that, everything is nice and smooth.

2 Boxes or more minimum to bring up the 40hz, and it's a party.
Anyone considering building cubes forget it.. this trounces the cube. Anyone considering building the big box, unless you REALLY need sub 40hz, forget it -- build this.

Here's the numbers:

40hz 98.5
45hz 100.5
50hz 102
55hz 103.5
60hz 105
65hz 105
70hz 105
75hz 104.5
80hz 104.2
85hz 104
90hz 104
95hz 104
100hz 104.5
105hz 105
110hz 105
115hz 105.5
120hz 106.5
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Old 17th August 2010, 01:40 AM   #60
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Thats pretty cute actually. I was looking at the original and I assume you adjusted for the saw cuts somewhere?
what does three of those stacked look like in horn response. You know me I like 3's.
Your inital numbers look better than the furysub. I like that it goes into mid bass territory.
Might be a really sweet compact system. Let us know how the cab flexes at 28v.

Last edited by screamersusa; 17th August 2010 at 01:48 AM.
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