Altronics 8" on special

PeteMcK · 10th November 2008, 08:39 PM

http://www.altronics.com.au/index.as...=item&id=C3088

at AUD29.50 pretty cheap, look good in an EBS alignment, Vas a bit on the high side for good WAF, an Isobaric pair give box size less than 30L though...

Moondog55 · 10th November 2008, 09:07 PM

Hi Peter, if WAF is the major factor then 2 off in sealed boxes seems better, crossing to subs of course.
Haven't heard them but look like your average"generic" Chinese/Taiwanese woofer.

TheSeekerr · 10th November 2008, 10:03 PM

Doesn't look like it'd handle the power required to run EBS, and sealed will give a pretty high -3dB point of about 68hz.

WinISD is suggesting ported with a box around 1 cubic foot, tuned to 35hz will give reasonable response to 41hz or so, so maybe that's the way to go?

(Wait, maybe I've mis-typed a specification somewhere, but for a single driver in a sealed box, I'm getting 19L, and 30L for a single driver in a ported box......where are you getting your large box sizes from?)

ttan98 · 10th November 2008, 11:24 PM

At this price those DIYers interested in building Line Array speakers may see their wish come true.

PeteMcK · 11th November 2008, 01:10 AM

Re: 'where are you getting your large box sizes from?' I was assuming 2 drivers EBS, I get around 114L, & different numbers to you for the other alignments, maybe I mis-typed...
Altronics specs are a bit like Jaycar's, a bit optimistic... the drivers would need to be tested. I'd buy a couple of pairs if I didn't have so many other drivers to deal with already, & I'm getting tired of large cabinets...

GM · 11th November 2008, 03:47 AM

Yeah, using the apparently measured specs in the pdf, a Vb = Vas, Fb = Fs EBS looks reasonable, so for two, a ~126.3 L net tuned to ~34.8 Hz and depending on the room/location, tuning as low as 25 Hz may work well. Configured as a MLTL would be even better.

For small, a Pi Align ~18.3 L (36.6 L for dual) tuned to ~45 Hz seems a good choice.

GM

10th November 2008, 08:39 PM	#1
PeteMcK diyAudio Member Join Date: Feb 2002 Location: Sydney	Altronics 8" on special http://www.altronics.com.au/index.as...=item&id=C3088 at AUD29.50 pretty cheap, look good in an EBS alignment, Vas a bit on the high side for good WAF, an Isobaric pair give box size less than 30L though... __________________ ‘today… there lives alongside the twentieth century the tenth or thirteenth. A hundred million people use electricity and still believe in the magic power of signs and exorcisms” Trotsky

10th November 2008, 09:07 PM	#2
Moondog55 diyAudio Member Join Date: Jun 2007 Location: Norlane; Geelong: Victoria: Australia	Hi Peter, if WAF is the major factor then 2 off in sealed boxes seems better, crossing to subs of course. Haven't heard them but look like your average"generic" Chinese/Taiwanese woofer. __________________ QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"

11th November 2008, 01:10 AM	#5
PeteMcK diyAudio Member Join Date: Feb 2002 Location: Sydney	Re: 'where are you getting your large box sizes from?' I was assuming 2 drivers EBS, I get around 114L, & different numbers to you for the other alignments, maybe I mis-typed... Altronics specs are a bit like Jaycar's, a bit optimistic... the drivers would need to be tested. I'd buy a couple of pairs if I didn't have so many other drivers to deal with already, & I'm getting tired of large cabinets... __________________ ‘today… there lives alongside the twentieth century the tenth or thirteenth. A hundred million people use electricity and still believe in the magic power of signs and exorcisms” Trotsky

11th November 2008, 03:47 AM	#6
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Yeah, using the apparently measured specs in the pdf, a Vb = Vas, Fb = Fs EBS looks reasonable, so for two, a ~126.3 L net tuned to ~34.8 Hz and depending on the room/location, tuning as low as 25 Hz may work well. Configured as a MLTL would be even better. For small, a Pi Align ~18.3 L (36.6 L for dual) tuned to ~45 Hz seems a good choice. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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10th November 2008, 10:03 PM	#3
TheSeekerr diyAudio Member Join Date: Jan 2008	Doesn't look like it'd handle the power required to run EBS, and sealed will give a pretty high -3dB point of about 68hz. WinISD is suggesting ported with a box around 1 cubic foot, tuned to 35hz will give reasonable response to 41hz or so, so maybe that's the way to go? (Wait, maybe I've mis-typed a specification somewhere, but for a single driver in a sealed box, I'm getting 19L, and 30L for a single driver in a ported box......where are you getting your large box sizes from?)

10th November 2008, 11:24 PM	#4
ttan98 diyAudio Member Join Date: Apr 2006 Location: Melb	At this price those DIYers interested in building Line Array speakers may see their wish come true.

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