60ndown's Merged Subwoofer Thread

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#541
HK26147 said:
Filters ( 2nd order and above ) are combinations calculated for a particular "nominal" load.
The inductor values go up with frequency the cap values go down with frequency. So impedance change is not being correctly compensated.
The transfer function could be determined by a sim program like Pspice.
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And does Pspice also 'see' the individual loading for each specific cab as well? 😉 impedance = loading related
 
#542
Djim said:
And does Pspice also 'see' the individual loading for each specific cab as well? 😉 impedance = loading related
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My understanding is that there are sim programs that will model that additional inclusion of reactive data vs frequency.
To be honest I don't know if Pspice does.
And this is only for simulating the electrical side of the equation.
 
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#545
HK26147 said:
Marvin Glenn's Audio-Spice modeling method
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ok,

but even all that dosn't take into account how far off my cuts were when building the box 😀

which reminds me of something i was thinking while building the box yesterday,

"if a person doesnt build their own horns/boxes/transmission lines (i mean use a tape measure, cut the wood, glue and screw it all together) they will never know if the guy that built their box was off by 6% in some way, and the sound system will never be right, and you'd never know why"

in my opinion, very few people could build this accurately

http://www.diyaudio.com/forums/subw...s-merged-subwoofer-thread-50.html#post2620940

but many would charge $1000 to try.
 
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#547
m R g S r said:
How is that doing the math on this one? Those are plans for the anarchy...
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60ndown said:
it was meant as a joke, i said *2* drivers 🙂
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60ndown said:
having been listening (and playing) music A LOT for 30 years, i can attest, the results in this instance are VERY good.

almost exactly what i wanted (room shaking lows at low volume)
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From building a box designed for a single anarchy 6.5, you put in a mismatched pair of drivers, and are obviously really joking about doing the math... and it's exactly what you want???

Usually putting a pair of drivers in a TH cabinet designed for a single really goofs things up. It typically ends up with a rising response instead of flat -- which means eq is needed.

Doing the real math will get you oh, so much more.... AND we can have a real discussion about how to make things good, better, or maybe even close to best.
 
#548
60ndown said:
  1. "if a person doesnt build their own horns/boxes/transmission lines (i mean use a tape measure, cut the wood, glue and screw it all together) they will never know if the guy that built their box was off by 6% in some way, and the sound system will never be right, and you'd never know why"

  2. in my opinion, very few people could build this accurately

  3. but many would charge $1000 to try.
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  1. :scratch1: Just buy the flat pack and the correct driver

  2. With the flat pack even YOU can build one

  3. The flat pack is $72 of CNC'd goodness
 
#551
60ndown said:
ok,

but even all that dosn't take into account how far off my cuts were when building the box 😀

which reminds me of something i was thinking while building the box yesterday,

"if a person doesnt build their own horns/boxes/transmission lines (i mean use a tape measure, cut the wood, glue and screw it all together) they will never know if the guy that built their box was off by 6% in some way, and the sound system will never be right, and you'd never know why"

in my opinion, very few people could build this accurately

http://www.diyaudio.com/forums/subw...s-merged-subwoofer-thread-50.html#post2620940

but many would charge $1000 to try.
Click to expand...


FWIW, if someone is off by 6% then maybe woodworking, subwoofer or speaker building isnt for them.

Honestly its not hard to get all the cuts right. Measure 5 times before cutting, TAKE YOUR TIME!! You are never going to be out more then a precentage, its the gaps you need to fill that matter.
 
#552
jbell said:
1. From building a box designed for a single anarchy 6.5, you put in a mismatched pair of drivers, and are obviously really joking about doing the math... and it's exactly what you want???

2. Usually putting a pair of drivers in a TH cabinet designed for a single really goofs things up. It typically ends up with a rising response instead of flat -- which means eq is needed.

3. Doing the real math will get you oh, so much more.... AND we can have a real discussion about how to make things good, better, or maybe even close to best.
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1.sometimes even a blind dog finds a bone

2.sweet, a big fat low end at low volumes is exactly how i want my HT sub, and i didnt need to use 4 x 18s in 8 cubes each.

3.no need, there are a lot of great designs already out there, if im going to spend money ill spend it on the correct driver and plans for a popular design, not test equipment.
until them im having fun (are you?)
 
#553
Where did the 6% error figure on build tolerance come from?

A bigger source of variability is the driver tolerance itself.
I've measured as much as 15% variance in T/S specs and that is not uncommon.
The more sophisticated the tuned design the more important it is to be on spec.
 
#554
60ndown said:
.
until them im having fun (are you?)
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I get to install football stadiums, gymnasiums, fairgrounds pa, auditoriums, church's, basement theaters, and do sound for the occasional 'in the park' kind of deal. I did a 450 seat auditorium on a single amp, with no driver (sub or top) bigger than an 8" and I can easily accomplish a (measured) 110db from 40hz on up in every seat of the house. (oh, and that theater now has a 30' screen... that too was cool.)

yea... I have fun.

I just do the 'forum thing' to try to help others, as I have a learned from others and it needs to be shared.
 
#555
I think everybody on the forum has fun, why would they bother otherwise?...
Funny is, that you keep on asking questions, keep on getting answers and still have to question everything that everyone says. If you have so much insight, why aren't we learning from you instead? You should be the one teaching us!

Now please, go play with your tools and wood and at least show pictures and a drawing with notes on some observations, if you don't care about measurement and calculations. Help US out for a change and let us learn from your tests.

An externally hosted image should be here but it was not working when we last tested it.
 
#557
ßart West-VL. said:
Help US out for a change and let us learn from your tests.

An externally hosted image should be here but it was not working when we last tested it.
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the best advice i can offer anyone today is,

remember why you started all this,


MUSIC

its not about spending hours obtaining the last few % from a plywood box,


Josh Ricci said:
Because once you have heard, used and built enough cabs, figuring out how to get that last little 7% performance improvement out of a design is what is most interesting.
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it is about spending as much time per week listening to the endless amazing musicians that have been reorded,

YouTube - ‪Victor Wooten Bass Solo‬‏
 
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#558
60ndown said:
sounds like a lot of work to me,

im a 'handyman' but you wont find me on any handyman forums.
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I guess I wasn't clear.... that IS what I do for fun... I'm a geek by day, that's what pays the bills... I do acoustics, video and audio for 'fun.'

Now, installing subs on the home side of a football stadium, walking across to the visitors side and placing your hand on the aluminum bleachers, and feeling them vibrate.... what's not fun about that?

AND... that's not even the best part....

60ndown said:
it is about spending as much time per week listening to the endless amazing musicians that have been reorded
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you say it's all about the recorded music? My college degree is music, playing the saxophone.... it's even MORE about creating the music in the first place. RIP big man....
 
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