Cheapie Dai-1chi 8" FR driver in an isobarik box?
Following up on a previous thread, here
diyaudio.com/forums/showthread.php?postid=271555#post271555
I'm intrigued to know if anyone thinks it's worth trying two of these in a ported box, mounted isobarik-fashion, coaxially, nose to tail, with a small pressure chamber.
What box size?
What pressure chamber size?
Connected in serial? or in parallel?
What port dia & length?
Any benefit in giving the inner unit a whizzer-ectomy?
Recapping the specs:
Dai-1chi SDC8-30 8" unit
Fo 54 Hz
Sens 91dB
30W nom
Qms 2.32
Qes 0.91
Qts 0.65
Vas 47.11 L
Z 8 Ohm Zo 24 Ohm
Sd 0.022 sq M
Any thoughts? javascript:smilie('')
Following up on a previous thread, here
diyaudio.com/forums/showthread.php?postid=271555#post271555
I'm intrigued to know if anyone thinks it's worth trying two of these in a ported box, mounted isobarik-fashion, coaxially, nose to tail, with a small pressure chamber.
What box size?
What pressure chamber size?
Connected in serial? or in parallel?
What port dia & length?
Any benefit in giving the inner unit a whizzer-ectomy?
Recapping the specs:
Dai-1chi SDC8-30 8" unit
Fo 54 Hz
Sens 91dB
30W nom
Qms 2.32
Qes 0.91
Qts 0.65
Vas 47.11 L
Z 8 Ohm Zo 24 Ohm
Sd 0.022 sq M
Any thoughts? javascript:smilie('')
Geoff H said:Hi Brisso57, They wouldn't be the ones from ebay a few weeks back with the cloth surrounds by chance?
Either way, probably not the best thing for an isobaric sub. I don't think there's much in the Xmax department.
Geoff.
No. They're not. (At least I don't recall that listing.)
I was just wondering if I could get better bass than in, say, a BR box.
Doug
Attachments
what is the practical way of reliably separating volumes of differing density?
Hi Dough,
I use insect screening net with similar mesh size like:
http://www.diyaudio.com/forums/showthread.php?postid=1171590#post1171590
The divider damping purpose is smoothing the dip at about 125 Hz and is not critical at all; I doubt you will hear the dip at all if left out.
This box should be designed as a very loosely filled box (acoustic compliance of the box paralleled acoustically with an acoustic resistance), i.e. ported (acoustic résistance, no mass) with the inside rear wall covered with ¼” felt or foam and only the external port is critical stuffed to convert.
The aperiodic external port is 1/3 x Sd = minimum size and can be made larger but I prefer this enlarging only if the air velocity is too high.
Small named this box type to The Leakage-damped Closed-box System, B3 aligned and is probably the easiest method to tame high Qtc for a WR or FR enclosure with high driver Qts besides the more difficult but superior Driver Qm damping method that also saves full bandwidth when done right.
b
1(1)
Attachments
Straight from the Wagner catalogue? I have 'em highlighted!
I would be keen to pick up a pair (or more) of the drivers to mess about with.
How much are they? My catalogue has no prices in.
The information published shows a nasty peak (typical) around 2 - 3kHz, with falling response there after. Might stick a little tweeter in the mix for the sparkle.
I am thinking of mounting on open baffle maybe.
Keep us updated with your ideas and results.
I would be keen to pick up a pair (or more) of the drivers to mess about with.
How much are they? My catalogue has no prices in.
The information published shows a nasty peak (typical) around 2 - 3kHz, with falling response there after. Might stick a little tweeter in the mix for the sparkle.
I am thinking of mounting on open baffle maybe.
Keep us updated with your ideas and results.
bobhayes said:Straight from the Wagner catalogue? I have 'em highlighted!
I would be keen to pick up a pair (or more) of the drivers to mess about with.
How much are they? My catalogue has no prices in.
The information published shows a nasty peak (typical) around 2 - 3kHz, with falling response there after. Might stick a little tweeter in the mix for the sparkle.
I am thinking of mounting on open baffle maybe.
Keep us updated with your ideas and results.
You can get them here
www.digitalmegahouse.com.au/speakers.html
which is where I first saw them.
I, too think that I'll try them first on an open baffle ... because I have two sheets set aside to try with another pair of drivers in any case. Serendipity!
I'll likewise keep reporting back ...
Doug
WES May 2005 catalogue lists the DC8-30 at $14.50. For OB use, look at the DC65-30 with a bass helper.
And this looks like the RS - Foster 4" dual cone, complete with cloth surround. 8ohm version in the WES catalogue.
http://www.digitalmegahouse.com.au/dc4-40.html
WES still don't have prices on the site.
http://www.wagner.net.au/Catalogue/wagner0020.html
Geoff
And this looks like the RS - Foster 4" dual cone, complete with cloth surround. 8ohm version in the WES catalogue.
http://www.digitalmegahouse.com.au/dc4-40.html
WES still don't have prices on the site.
http://www.wagner.net.au/Catalogue/wagner0020.html
Geoff
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