large quarter wave, HELP!!

psychosteve · 6th October 2004, 04:14 PM

ive just been given, yes for free!! an eminence Beta15, the new 350 watt ones, its got a bit of scuff dammage on it, the shop was ram raided!!
so i was thinking, could i build a quarter wave box, to use as a centre speaker. i know i could!! but ive never been good at designing things, and dont have much computing and design stuff, i only got abacus last week!! so any help with plans and or plots would be great. cheers guys, steve.. ..

Timn8ter · 6th October 2004, 05:17 PM

Uh....

Why would you want to use a large woofer as a center channel speaker? It's mid-range response is going to be pretty ragged and HF is non-existent.

psychosteve · 7th October 2004, 11:25 AM

because its backed up with motorola mid / high horns and apt80 compression tweeters. and i want to see if i can do it, if i can, i may go and buy another beta15 and move them to front pair. c u later, steve.. ..

BillFitzmaurice · 7th October 2004, 12:58 PM

A Beta 15 has usable specs for a QWTP, but you're going to end up with a minimum 6 cu ft box, which frankly is silly for a center channel. It could be made good to 30 Hz in a ten foot pipe- but that's what subs are for. Even L/R mains don't need to go below 80 Hz.

psychosteve · 8th October 2004, 11:39 AM

at the moment its in a 200 litre box, but the box is damaged, 6 cu.ft. is ok. but now your talking with a 10ft pipe!! yum, yum. what sizes would you recomend? or what software that is easy to use, and freeware!! so i can model it myself? see you soon, steve.. ..

joensd · 8th October 2004, 02:08 PM

http://www.quarter-wave.com/
You´ll need to download the sheets you need and the mathcad-explorer.
You should also read the articles there ,check out Bob Brines homepage and just search here through the forum.

6th October 2004, 04:14 PM	#1
psychosteve diyAudio Member Join Date: Sep 2004 Location: coventry england	large quarter wave, HELP!! ive just been given, yes for free!! an eminence Beta15, the new 350 watt ones, its got a bit of scuff dammage on it, the shop was ram raided!! so i was thinking, could i build a quarter wave box, to use as a centre speaker. i know i could!! but ive never been good at designing things, and dont have much computing and design stuff, i only got abacus last week!! so any help with plans and or plots would be great. cheers guys, steve.. .. __________________ you all laugh because im different, i laugh because youre all the same.. ..

7th October 2004, 11:25 AM	#3
psychosteve diyAudio Member Join Date: Sep 2004 Location: coventry england	to see if i can? because its backed up with motorola mid / high horns and apt80 compression tweeters. and i want to see if i can do it, if i can, i may go and buy another beta15 and move them to front pair. c u later, steve.. .. __________________ you all laugh because im different, i laugh because youre all the same.. ..

8th October 2004, 11:39 AM	#5
psychosteve diyAudio Member Join Date: Sep 2004 Location: coventry england	at the moment its in a 200 litre box, but the box is damaged, 6 cu.ft. is ok. but now your talking with a 10ft pipe!! yum, yum. what sizes would you recomend? or what software that is easy to use, and freeware!! so i can model it myself? see you soon, steve.. .. __________________ you all laugh because im different, i laugh because youre all the same.. ..

8th October 2004, 02:08 PM	#6
joensd diyAudio Member Join Date: Dec 2001 Location: Germany	http://www.quarter-wave.com/ You´ll need to download the sheets you need and the mathcad-explorer. You should also read the articles there ,check out Bob Brines homepage and just search here through the forum. __________________ jens

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6th October 2004, 05:17 PM	#2
Timn8ter diyAudio Member Join Date: Jul 2003 Location: Seattle, WA	Uh.... Why would you want to use a large woofer as a center channel speaker? It's mid-range response is going to be pretty ragged and HF is non-existent.

7th October 2004, 12:58 PM	#4
BillFitzmaurice Banned Join Date: May 2004 Location: New Hampshire	A Beta 15 has usable specs for a QWTP, but you're going to end up with a minimum 6 cu ft box, which frankly is silly for a center channel. It could be made good to 30 Hz in a ten foot pipe- but that's what subs are for. Even L/R mains don't need to go below 80 Hz.

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