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-   -   RCF pro subwoofer - what kind of enclosure ? (http://www.diyaudio.com/forums/subwoofers/178432-rcf-pro-subwoofer-what-kind-enclosure.html)

Mordor 3rd December 2010 01:26 PM

RCF pro subwoofer - what kind of enclosure ?
 
Hi, i have my old ( but new :) ) RCF L15P200AK ( im italiannnn ).
Is a 4ohm 15" pro woofer, whit 800 wrms ( but in my car was powered whit 1000 w rms reflex enclosure without problem ).
Now i want to make an enclosure for use in pubs or indoor ( i've a metal band ) or for home cinema use ( lol :D ).

im thinking about a 4th or 6th order box, but qts is 0.35: low for 4th and high for 6th. i havent try 4th or 6th order box on my project, but i must optimize linearity and efficiency..
Some ideas and knowledge about?
Sorry for my bad english

Some value:

Resonance frequency: 38 Hz
DC resistance: 5.9Ω
Mechanical factor: 6.8
Electrical factor: 0.38
Total factor: 0.35
BL Factor: 21.2 T m
Effective Moving Mass: 121 g
Equivalent Cas air load: 139 liters
Effettive piston area: 0.083 m
Max. linear excursion (mathematical): 9.8 mm
Voice - coil inductance @ 1kHz: 2.2 mH
Half-space efficiency: 1.93%

bjorno 4th December 2010 03:34 PM

1 Attachment(s)
Hi Mordor,

This driver of yours is IMO very good for both home or PA use as using a very favorable compression ratio:

This property makes it possible to lightly damp ~half of the airways for a TH that would move possible SQ into the HiFI area realm without loosing low end efficiency and sounding like an T_TQWT.

b:)

Mordor 4th December 2010 04:02 PM

Thank u so much... i will go with horn enclosure... Band pass is not good for eff?

Ive seen "cubo15" project.. is a small enclosure..

Xoc1 4th December 2010 10:09 PM

Hi Mordor
Have you read this thread
http://www.diyaudio.com/forums/subwo...-horn-rcf.html
Your RCF driver is slightly less efficient when put into the sim but still looks OK.

Rademakers 5th December 2010 05:49 PM

Hi,

The RCF L15P200AK will work in Cubo 15 and take 800 - 1000 Wrms mechanically (with a ~40 Hz high pass). Cubo 15 will work well with PA drivers intended for reflex use but you will have to find something else for HT use ;)

Regards Johan

Mordor 6th December 2010 06:33 AM

Why? Linearity problems?

djk 6th December 2010 03:41 PM

That driver would make a great home theater subwoofer in a tapped horn design.

Here is a design for a similar Electro-voice driver, it should be able to hit 130dB in the corner of your room, and is useable to 20hz.

http://i56.photobucket.com/albums/g1...ch/EVX150A.gif

Rademakers 7th December 2010 05:40 PM

I meant Cubo 15 isn't suited for HT (it's meant for 40 Hz and up), however the driver is. I'll second djk, that the driver itself in a tapped horn could be used as a neet 20 -25 Hz and up sub (even in 2,0 pi).

Best regards Johan


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