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-   -   full range box size when using a subwoofer (http://www.diyaudio.com/forums/full-range/140752-full-range-box-size-when-using-subwoofer.html)

pforeman 19th March 2009 01:58 PM

full range box size when using a subwoofer
 
So many choices, each one changes what the other best choice might be!
I was planning on using either a AN super 10 or Fostex unit, but I wanted to use an active subwoofer with it.
If I use a subwoofer, and the AN super 10, do I need to worry about which one of "their boxes" to use (one port, two ports, as suggested by scottmoose- lengthening the port(s) on the double port, or is this a non issue
Also If I am using a sub, and instead of using a BSC, couldnt I tune the box a little higher to raise the output of the upper bass, lower mids?
I'd rather get the highest sensitivity speaker I can and not lose any more than I have to b/c I will be running them with a low powered triode
Thanks,
Paul

human.bin 19th March 2009 02:53 PM

I`m not the most helpful guy to give an answer, but if you read customer comments on CSA website, you`ll find the most enthusiatic one is for a pair of AN 10 openbaffle crossed to active sub, you can probably ask david dicks about that one too.

i was thinking of doing it myself with my pair of super 8, but have no time these days...

btw if one has an appropriate room, and doesn`t plan to take bass out of the fullrange units, what advantage can come from building boxes for them?? i`m asking this because i never heard a serious horn design, would one miss something going OB? something that can`t be done from an appropriate sub, maybe horn loaded one?

hm 19th March 2009 03:21 PM

"because i never heard a serious horn design"

what about my range of satellite horns for active
sub moduls down to~100 Hz
HORN
TRUMPET
SCHALMEI

with measurements and feedback + plans.

for a sat 8" is a max.

best in size and sound the Schalmei

http://www.abload.de/img/sathornaussen2web6eyk.jpg

http://www.abload.de/img/fostexelephant2webwkqo.jpg

http://www.abload.de/img/schalmeisat1yn1v.jpg

Scottmoose 19th March 2009 03:26 PM

Unless I've missed something obvious, he's not asking for one Horst, or for any self-promotion: he's simply saying he hasn't heard a serious example of the breed, and asking if there are any reasons to run monopole rather than dipole if the wide-band unit is not expected to handle bass frequencies.

Anyway, it rather depends. Not everybody likes the sound dipoles provide, and even when crossing to bass units you still have to be a bit careful. Baffles are the least mechanically efficient way of running a driver, and most FR units don't have a whole load of linear excursion to play with. If you need fairly high SPLs, you'll likely need to hand over to supporting drivers at a higher frequency than a simple subwoofer can be / should be run to keep distortion within acceptable boundaries, especially for heavier material (orchestral, prog rock etc).

Quote:

If I use a subwoofer, and the AN super 10, do I need to worry about which one of "their boxes" to use (one port, two ports, as suggested by scottmoose- lengthening the port(s) on the double port, or is this a non issue?
Don't go bringing me into this! At least, not without a strict context... ;)

FWIW, as a personal choice, I'd probably look at going with an AN10 or FE206E, sealed, and cross to 15in HE woofers either at 200Hz or 500Hz depending on where your priorities lie, at least 2nd order. Assuming that's a little OTT for you, then I'd probably end up with an AN10 or FE207E in a BR, and support with (preferably) twin subs. That way you won't need an especially low tuning for the main units, which is all to the good.

planet10 19th March 2009 06:03 PM

If you have woofer support, why not get a smaller driver with better top.

I finally got to hear AN10s on the WE, they have potential (they were hindered somewhat by the David Dick's style box), but need a tweeter IMHO.

dave

Scottmoose 19th March 2009 06:16 PM

Interesting. Out of interest, which box were they in -2.8?

Good point -if the XO is high enough, a smaller driver will likely be more refined (unless insane SPLs are needed of course... :devilr: )

planet10 19th March 2009 08:57 PM

2 Attachment(s)
Quote:

Originally posted by Scottmoose
Out of interest, which box were they in -2.8?
Yes. John just brought out his AN10 & AN12 for measure TSP. Here is the modeled response using measured parameters of the AN2.8 cab with AN10 with 6" port (2 3" ports have a less dramatic bump). I sent John home with a length of 6" PVC pipe. I suggested extending the port to 10 1/2".

dave

planet10 19th March 2009 08:59 PM

2 Attachment(s)
The impedance curves were revealing... that ripple train has to be quite audible... they could explain the need i felt for a tweeter... it could well be that the top end is there but very confused.

dave

chrisb 19th March 2009 09:07 PM

Quote:

Originally posted by planet10
The impedance curves were revealing... that ripple train has to be quite audible... they could explain the need i felt for a tweeter... it could well be that the top end is there but very confused.

dave


As I recall the whizzer cone material looked rather thick, and the phase plug a bit short ?

Scottmoose 19th March 2009 10:45 PM

2 Attachment(s)
Ha! That coincides almost exactly what I've been predicting for the past year or so, with a ruddy great peak at Fb. I don't have the exact dimensions for the 2.8 box, but this is what MathCAD predicts, with the dimensions fudged from the site, a 6in vent, & the claimed driver specs...

Welcome to the house of fun. :rolleyes:


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