R evenge C omes with F orce

[Djim]

hi djim
group delay and impulse look verry good,at least in the sim.
i added a chamber to damp the out of passband peaks a bit.
still think you need a power plant to get to the max of them

I like your explanation "at least in the sim". The trouble is not the sim, but the reality of surface versus panelflex and keep everything in transportable weights. A 700liter cab is going to be quiet heavy with all extra bracing...

And since the request was 35Hz and he has only 2000W per channel it sounds more interesting to use double 18's and get more SPL from it.

 

[olsound]

I like your explanation "at least in the sim". The trouble is not the sim, but the reality of surface versus panelflex and keep everything in transportable weights. A 700liter cab is going to be quiet heavy with all extra bracing...

And since the request was 35Hz and he has only 2000W per channel it sounds more interesting to use double 18's and get more SPL from it.

Which 18 do you have in mind
The rcf price is $500.00

 

[Djim]

Which 18 do you have in mind
The rcf price is $500.00

Even cheap ones can beat your RCF with just 2000 watts. Like Epa said you'll need a serious power plant cause your 2Kw is just going to 'tickling' the 21"

Look for 18" (8Ohm) with an Fs of <35Hz and a AES power rating of at least 700Watt continue and Xmax of > 7mm.
Or 18" (4Ohm) with an Fs of <35Hz and a AES power rating of at least 1200 Watt continue and a Xmax of >9mm

 

[olsound]

Even cheap ones can beat your RCF with just 2000 watts. Like Epa said you'll need a serious power plant cause your 2Kw is just going to 'tickling' the 21"

Look for 18" (8Ohm) with an Fs of <35Hz and a AES power rating of at least 700Watt continue and Xmax of > 7mm.
Or 18" (4Ohm) with an Fs of <35Hz and a AES power rating of at least 1200 Watt continue and a Xmax of >9mm

Thanks for the info I wil keep it in mind
In the future I will invest in a more powerful amps for the rcf.
If you want you can assist with this project your knowledge is welcome.

 

[epa]

first ruf sketch

 

[Djim]

Which 18 do you have in mind. The rcf price is $500.00

In the future I will invest in a more powerful amps for the rcf.

You seem to worry about 130$ difference between 2 x18"drivers over one 21" while you don't have a problem investing several hundreds to thousand$ for an heavier amp

(Ah, I see the 'Epa folding style' is returning )

 

[olsound]

first ruf sketch

That look good,anymore up your seleve

 

[epa]

i have a moddeled a lot.
you sugested to go for the symetrc aproach.
if you click my nickname>find more post from epa,you wil find many more .
if you find a model that you like i can scale it up to your likings.
start here or here f.i.

 

[olsound]

first ruf sketch

This one is ok

 

[epa]

i got a long free weekend coming up.
if u like this model i can work it out in detail.
how are your "skilz" ?

 

[olsound]

Yes I like this model.

My carpenter skill sucks.

 

[weltersys]

Yes I like this model.

My carpenter skill sucks.

Then use lots of paintable caulk to fill the gaps .

 

[olsound]

Then use lots of paintable caulk to fill the gaps .

[image][/image]
The last time I try to build a midrange box I lose my girlfriend and hurt my finger.oh and the midrange box look like sht

 

[epa]

Yes I like this model.

My carpenter skill sucks.

ok ,i wil make it as simple as possible.
what size's (and thickneses)of wood are availeble where you live ?

 

[olsound]

ok ,i wil make it as simple as possible.
what size's (and thickneses)of wood are availeble where you live ?

4x8 ply 3/4 and 1/2 are available

 

[epa]

i got 2 models here
the one on the left has a bigger chamber shorter hornpath.
i like to here the experts on pro's /con's for these 2 models.
the width is 4' wich would be 121.92 cm correct?
hight 70 cm ,depth 87.5 cm.

 

[olsound]

I would go with the one that give off a smoother response. which one is better

 

[olsound]

i got 2 models here
the one on the left has a bigger chamber shorter hornpath.
i like to here the experts on pro's /con's for these 2 models.
the width is 4' wich would be 121.92 cm correct?
hight 70 cm ,depth 87.5 cm.

I also like the design on the right

 

[epa]

if we make it 65 high ,we need only 1x bracings horizontal.
responce would be verry close to the 75 high box,but we improve on transportabilety
also more economical 2x hight of 4'
i think we can make it from 2 sheets.

 

[epa]

I also like the design on the right

my favorite would be the richt one.
it has a better groep delay,and better impulse.
lets wait and see what the experts say about that.