Cinema speaker with PAudio components

[MarinZ]

HI to everyone!

I do have one situation, in 60's ex. Yugoslavian company ISKRA did producing some speaker for cinema, they were big bass-reflex cabinets about 230litre with one 15'' unit, on top it was Altec 811B horn with 802D driver for HF, that did sound pretty good. Now, I do own still some boxes and wanting to upgrade them for one cinema (don't have drivers inside). Was thinking of use cheap PAudio drivers. For start I would be using biggest PAudio HF driver, BM-D750 it has 3'' coil, 2'' open and will be mounted on their PH-2380 horn, which is 90X40 degree, like most cinema horns used in 2 way.

But now is problem what to use on cabinet and how it will work, it's 91X70X42 cm, wood is 2cm tick, and there is open for 15'' bas, and 39X15 bass reflex vent above speaker.

A drivers I wanna use are:
E-15LF
800W/8Ohm
96dB 1w/1m
50Hz-1500Hz
Fs 50Hz
Vas 92Litre

C15-600El
600W/8Ohm
98dB 1w/1m
30Hz-1200Hz
Fs 42Hz
Vas 169Litre


Please advice me in any kind, as I'm not some great mind in speaker building!

[enigmaticEntity.]

If those dimensions are measured on the outside, then the volume of the cabinet is 218L.
If they are inside dimensions, volume is 267L.

Do you have the Qts for the drivers? It will make the selection a little easier.

Using Qts = 0.40 (which may NOT be correct) the C15-600El will be better due to its larger volume requirement.

I'm not very experienced with speakers either, but here is a page with some simple formulae. That should be a start, as long as you can get the driver Qts.

Also check out WinISD for modelling the response for <1,000Hz.

I hope this helps somewhat, but you may need someone with more experience to point you in the right direction.

[MarinZ]

The C15-600El driver I was think to use....it has Qts=0.31, and as you said there are outside dimensions so volume is 218 litres.

[MarinZ]

As you pointed volume is 218L, as I give outside dimensions. Also, the C15-600EL has Qts = 0.31