C/E/X PA Flat to 30 (FT30) PA TH Awesomeness

[epa]

The disadvantage he can not use 600Watts but 450 watts max per driver but he will reach 130dB from a stack of 3.

Edit: Where do you put S4 in your drawing from post #557?

schetsje

 

[Djim]

Did some calculations, but if you want to go from 1250cm^2 to 5000cm^2 it needs to be 56,3 cm deep.

 

[epa]

56 cm deep cavity wil make the cab to big imo.
you would be better of with a "normal" fold ,me thinks.
comparing sim 557 to 559 looks pretty simular below 80 hz.
except the cavity is much less .
why not bild a flh with detachable wings,that wil give at least 135 db from 32hz up

 

[Djim]

Going for a smaller opening in S4 or reducing the cavity, like usual TH's, will end in a pipe not a horn. Going complete FLH style and you'll end up with even bigger cabs and these cones are not up for that task.So somewhere down the line some concession needs to be made. The last cavity (extension section) can be made as an attachable unit to safe weight.

 

[Djim]

This will be the TH without the extension. S3 sits exactly where the opening starts. S5 (opening) is 40cm high and 62.5cm wide.

Everything is still transportable and he even can use them in singles for small gigs if needed. With 400Watts per cab he reaches physical Xmax (based on 3dB power compression). 3 cabs still have a max SPL output of 130dB. Low cut filter (at excursion dip) 34Hz - 24dB/oct.

 

[Djim]

The optional extension is still possible. The difference in SPL doesn't seem much improvement for all the extra's.

But to see the real value of such extension you have to look at the differences in efficiency and its relation to losses (power compression) that don't turn up in the SPL response.

The efficiency is >2 times higher at 38Hz... with the extension.

 

[Djim]

HornResp input for the extension;

 

[NEO Dan]

HornResp input for the extension;

Switch to TH1 driver placement, double click on TH.

 

[Djim]

Thanks Dan, looks like I was still chewing on that old horse...

 

[NEO Dan]

You fellas are attempting to squeeze blood from a fragile stone methinks. I PM'd Justin in a in effort to get him onto drivers with more displacement.

 

[Djim]

I know, but Crescendo seems to have limited financial sources at the moment. We already suggested to him to sell his drivers half year ago, but he wants to know what is possible with these 3015lf's (and probably decide than).

 

[NEO Dan]

If they are not beat up he should be able to sell them to SS15 builders for a reasonable profit, more than enough to cover the driver I have in mind($125).

 

[Djim]

What driver do you have in mind if I may ask, I guess they are more expensive here in Europe?

 

[NEO Dan]

Unfortunately it is not a driver with worldwide distribution, about like getting BMS in the US.

 

[CRESCENDO]

I need to play catch-up tomorrow.

A little big, but before I turn off my computer:

 

[salzburgsoundsystem]

Drivers with more displacement

You fellas are attempting to squeeze blood from a fragile stone methinks. I PM'd Justin in a in effort to get him onto drivers with more displacement.

May I ask which ones?

Regards, Ben

 

[Djim]

An externally hosted image should be here but it was not working when we last tested it.

 

[epa]

that looks doable,cab dims 43x122x85=445 lts netto
but with or w.o. wings like post 562 ?

 

[NEO Dan]

try this, see what you can get out of it.

--- mechanical ---
Fs           26.057  Hz       Free air resonance
Qms        12.247           Q mechanical
Vas         490.364l        Suspension compliance
Cms        223 um/N      1/(suspension stiffness)
Mms        167.28 g       Moving mass
Xmax       6mm           Maximum acoustic linear motion
Xmech     20mm        Mechanical displacement
Sd           1244.10  cm^2      Piston area
--- electrical ---
Qes        .295808            Q electrical
Re           5.556  ohms     Voice coil DC resistance
Le           2.77                 Inductance @1 kHz
Z           23.696  ohms     Impedance @1 kHz
BL          22.681  Tm       Motor force - Newtons/Amp
--- electro-mechanical ---
Qts        .288832           Q total
no           2.756  %        1/2-space ref efficiency @ 1m/1W
1-W SPL     96.42  dB       sensitivity at 1m on-axis 
2.83V SPL   98.004  dB       sensitivity at 1m on-axis 
  --- motor constants ---
Krm        686.604E-06 ohms     constant resistive motor impedance
Erm          1.100E+00          exponent resistive motor impedance
Kxm         36.159E-03 Henries  constant reactive motor impedance
Exm        709.172E-03          exponent reactive motor impedance

 

[Djim]

that looks doable,cab dims 43x122x85=445 lts netto
but with or w.o. wings like post 562 ?

Hi Eric,

Wings or Ears can still be used to improve directivity and gain a little low end. >60cm (per side) will do and can also be used as cover for the front for instance.