what size enclosure for vented celestion tf1020

[charlie2]

parameters

http://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CEEQFjAA&url=http%3A%2F%2Fcelestion.com%2Fproduct%2F107%2Ftf1020%2F&ei=Pl-JVbXvDunW7QbZl4H4BQ&usg=AFQjCNHx3tSP2aasVhEFqNbKo2OH7wC3Tg&bvm=bv.96339352,d.ZGU

hi i have two speaker boxes which i can butcher the internal measurements are 220mm X 235mm X 770mm
external 250x800x265mm

i have two spare drivers to play with and two ports 75mmD x 150mmL what is the best i can do here.

compression driver and wave guide to sit on top




thanks

 

[Lojzek]

Hi,

according to TS parameters, you are good in 30-40 liters vented
for 1 woofer. Expect F3/F6/F10= 60/50/45 Hz. Vent length of 3-4"
will get you there. A 1" compression driver in a constant directivity
waveguide sounds like a good idea, crossed at 1,6 kHz or so. Would
not hurt to experiment with the tuning of the box (Fb) to your taste.

 

[charlie2]

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

does this look right?????

 

[Lojzek]

That's unnecessary loss of the bass in a too small of a box (17 lit).

 

[charlie2]

thanks just trying to use online calculators (free)

did not think it was right

much appreciated

 

[Lojzek]

Check out free software (Excel based) "Unibox" or "Woofer
box and circuit designer". You will probably be overwhelmed.

 

[charlie2]

the plan is to add a new false front baffle but what width??? (existing)

the waveguides are pyle PH-612 12"wide jbl clones, existing boxes are (9.75")250mm wide

if i like the sound i may cut into the baffle to mount the waveguide and compression driver

does this make sense

 

[Lojzek]

For best results, mount the waveguide in the baffle flush, the diameter
of the rounded edges should be large enough for least diffraction issues
and fill the voids between the baffle and waveguide with a putty or
something. Just make it smooth. It would be better if your waveguide
had smoother transition from the mouth to the outside.

Your success will depend massively on how you will do the XO filter.
Without measurements, I don't think you stand a chance of building a
good sounding PA speaker.

 

[charlie2]

this is my version of an econowave will do a price list later in thread

miniDSP for xover ecm8000 when i get round to ordering one

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

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

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

 

[sreten]

That's unnecessary loss of the bass in a too small of a box (17 lit).

Hi,

I wouldn't agree. No point chasing bass for a 60Hz driver,
and ~ half Vas is fine for Vbox for a Qts of 0.32 driver.

This is PA stuff I assume, and oversized boxes are bad.

rgds, sreten.

 

[Lojzek]

I agree, there is nothing wrong with having a Qts of 0,32 in a volume
of half of Vas. I assumed it would have been used at moderate levels
in a home, so why not squeeze more juice out of it.

 

[charlie2]

home use but i do like to crank it up once in a while.

their will be a sub for lower cut off

 

[sreten]

Hi,

Home use with a sub is probably best compact sealed.

rgds, sreten.

 

[charlie2]

Hi,

Home use with a sub is probably best compact sealed.

rgds, sreten.

hi sreten

when i say sub there will be one knocked up. from previous posters and measurements. to compliment my open baffle

two subs are available at the moment, but to be honest my past experience is subs are graining upon me not nice sort of speak(probably not very well implemented) integrated

 

[charlie2]

baffles cut

glued temp screws

port hole will be low so that if need be enclosures can be cut down in size to be sealed or portwd but less internal volume.

thanks for comments so far and appreciate further input

 

[charlie2]

Hi,

Home use with a sub is probably best compact sealed.

rgds, sreten.

EBF of 168.7 suggests ported ?????

 

[Richard Ellis]

Plugging in the parameters & tweaking the fb & Volume, I get 48L with an fb of 68.
-3.04 Db gets me 61.65 Hz.....falling at a rate of 16Db per octave after that.




_______________________________________________________Rick.........

 

[sreten]

EBF of 168.7 suggests ported ?????

Hi,

All depends on the x/o frequencies to the sub(s).

rgds, sreten.

 

[freddi]

those boxes are plenty big - larger after driver and horn displacement than a Zu Druid

my fake Druid lined not stuffed

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

 

[Richard Ellis]

baffles cut

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

glued temp screws

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

port hole will be low so that if need be enclosures can be cut down in size to be sealed or portwd but less internal volume.****** What is the inner port diameter? What kind of volume did you "best guess" you'll be working with?? ***###Rick..........

thanks for comments so far and appreciate further input