High-end 3 way dáppolito with aluminiumcone

[Helmuth]

sph250ctc

Kevlar?...looks more like carbon to me

Your right Tinitus sorry for my poor English.

 

[tinitus]

Kevlar is medium light and somewhat "soft" and flexible with the highest streching strength

Carbon is super light and hard with superiour stiffness

If epoxy is used as resin hardening with moderate heat is possible

To my limited knowledge 😉

 

[Helmuth]

When I am building I can look for hours to it.😀

These quality loudspeaker poles I like no bling bling no-nonsense.

 

[Helmuth]

Hello,

I've got some problems here, I order two monacor subs by bmm-elektronics.

After ordering I pay direct with Ideal. The order was send 2.5week later.

Direct was clear one sub was defective the second seemed OK but after testing it in the box this week it has the same problems as the first one. Manufacturing fault or transport damage on the outside they look ok.

I will keep you updated with the Guaranty completion of BMM. Till now I send one back and send after that three emails without reaction😕

Till then the project stops.

 

[Nanook]

Helmuth, sorry to hear of your driver problems...

if they persist, perhaps a different driver?

Monacor drivers are reputably excellent , considering their price. Not sure what else is available in Europe that may be similar (brands available here vs. there are different....).

In what way are they defective? if just dustcap glue. you can peel the dustcaps off (usually) and replace or re-glue them.

What is the calculated volume for the sub enclosure?

stew

 

[BERENO]

Re: Helmuth, sorry to hear of your driver problems...

Monacor drivers are reputably excellent , considering their price...
In what way are they defective? if just dustcap glue. you can peel the dustcaps off (usually) and replace or re-glue them.

Is it common for these drivers to be found defective? Or did he just have some really bad luck? 😕

Didnt he say it is sitting off-center and rubs the pole piece?

 

[Nanook]

BERENO, I re-read the info...

and yes the voice coils are reportedly rubbing...

probably just a poorly glued driver surround pulling them off centre, but if Monacor offers a warranty, well, use it of course.


stew

 

[Helmuth]

The nett enclosure volume is 68 liter.

Listing to to sub it actually did have response down to 26Hz and keeps on working down to 18Hz.

So I am very content with the sub it is really a impressive performing chassis.

I hope it only a quality problem off the manufacturer. And the that the shop helps to solve this problem quick.

 

[meanman1964]

Hi Helmuth,

Nice looking speakers but I've one question.The foam you're using is that coming from a store called Gamma?If yes don't use that foam it doesn't work at all.A friend and I did measure that together with real Pritex.

 

[Helmuth]

Nice looking speakers but I've one question.The foam you're using is that coming from a store called Gamma?If yes don't use that foam it doesn't work at all.

Hi meanman,

Yes it comes from the gamma and I did use it before. And can hear it damped the reflexions.

So can you explain what you did measure.

Witch effect did you want to have of it.

 

[meanman1964]

You see the diffirence just by looking at it when you hold it against the light,you see the light coming trough the Gamma foam.The damping of pritex is much higher you can realy hear it.You can mail me than we could write in dutch.

 

[speakerdoctor]

I think the foam must be open cell type and of reasonable density to be an effective absorber.
Illbruck's Sonex* Pyramid stype acoustic foam has a density of 0,5 to 0.7 lbs/cu. ft. and doesn't do much absorbtion below 500 hz. Above that it improves quickly from .5 to about 1 in the 4-5 kHz range.

See http://www.illbruck-sonex.com/pdfs/Pinta_Product_Sheets/PSpinta_SNXpyramid.pdf

* Illbruck is a long recognized leader in the manufacture of acoustic foam panels.

 

[Helmuth]

Hi,

Both chassis sph250ctc are send back to Monacor. Hope they will respond whit a new set. Because these one's a can't use.

I have to wait a wile.

Greetz, Helmuth

 

[kukuruku]

hi helmut i look your project and that is interesting for me, what you say about dt-25n, ms-150, sph-250ctc for speaker system. Ms-150 maybe better beacouse it is close construction 🙂

 

[Helmuth]

hi helmut i look your project and that is interesting for me, what you say about dt-25n, ms-150, sph-250ctc for speaker system. Ms-150 maybe better beacouse it is close construction 🙂

Why ms150 for that price mutch nicer chassis are to find. I do not restrict my self to monacor.

And witch frequency you want to filter?

 

[kukuruku]

I want made active system with Balance input, frequency at active crossover 350Hz, 2500Hz. price 17.7euro middle choise and ms-150 have matching closed volume dampened - we are haven't problem with midrange driver ,
Can't lowrange interact at midrange then we need to additional correct system

 

[Helmuth]

I want made active system with Balance input, frequency at active crossover 350Hz, 2500Hz.

price 17.7euro middle choise and ms-150 have matching closed volume dampened - we are haven't problem with midrange driver , Can't lowrange interact at midrange then we need to additional correct system

If you want high quality balanced input amplifiers see here. Super low distortion.
http://www.bmm-electronics.com/Product.asp?Product_ID=4709

I don't want to filter at 2500Hz. Phase fault, sound pressure level variation interference distortion. And that all in the part where the ears are the most sensitive.

I will filter in a aria were the sensitivity of our ear has reduced largely.

Here the figure of our hearing. And I have marked the aria where I don't want to filter.

That is why it is very important to find a High quality midrange driver because this aria is our ear the most sensitive.

So the midrange driver makes or brakes the response of your system IMO.

Regards Helmuth

 

[kukuruku]

If you want high quality balanced input amplifiers see here. Super low distortion.
http://www.bmm-electronics.com/Prod...Product_ID=4709
Thankyou for the propouse, i will make balance, active crossover and amplifier (lm3886) myself

 

[Helmuth]

Thankyou for the propouse, i will make balance, active crossover and amplifier (lm3886) myself

When your searching for a very good low price midrange from monacor I advise you The msh115. Nice flat response up to 10kHz.

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And as tweeter a ribbon rbt95sq. Not expensive top performance above 5kHz. (I advise 8kHz.)

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I hope I help you with this tip Kukuruku .

 

[kukuruku]

the ears are sensitive to diferent sound presure level ( msh115 and rbt95sq). that situation needed second additional corect - i look way where is easy speaker system (box and speaker)