OPEN BAFFLE QUERY for Aussies

Moondog55 · 18th August 2008, 10:42 AM

I just bought a pair of Magnavox 8WR speakers as a whim, they cost me a dollar.
I have in the shed a panel of MDF 1220 X 450 and enough scrap to add wings about 300 deep.
I also have 2 pair of "Jaycar" 12 inch paper cone woofers, I know that the stated power handling of the Jaycars is optimistic but the Magnavox will probably take 15-20 watts if I remove some of the bass and send most of the LF to the 12 inch woofers.
I am actually surprised at how nice the Magnavox sound even if a little ragged. As a dedicated mid they may sound a little better.
I'm asking for a little help with a simple crossover to suit this combination of drivers and baffle.
They will be a gift for friends and I have spent as much as I can really afford so I'm hoping I can use what have in stock as far as inductors and caps go.
Will a second order at around 200 be OK???

Brisso57 · 18th August 2008, 11:28 AM

I've also toyed with a pair of 16ohm 8WR's.
Wanting a bit more sparkle, I added a piezo supertweeter, using a cap for a 1st order XO.
I used an L-pad on the piezo.
No too bad.

cheers

Doug

PS, did you see the 8WR's in the open-rear cabinet on fleaBay?

Brisso57 · 18th August 2008, 11:39 AM

Quote:

Originally posted by Brisso57

PS, did you see the 8WR's in the open-rear cabinet on fleaBay?

Here's the link:
cgi.ebay.com.au/Vintage-Wooden-Floor-standing-Speakers-Magnavox-8WR_W0QQitemZ230281979740QQihZ013QQcategoryZ14990Q QssPageNameZWDVWQQrdZ1QQcmdZViewItem

Follow the link on the eBay page and you can get a dimensioned picture of the cabinets.

cheers

Doug

Moondog55 · 18th August 2008, 11:54 AM

Hi Doug, these were in a small 19litre sealed box and they are the 8Ohm version, I'll add a super tweeter if I need to.
These were from Ebay but pick-up in Melbourne

Moondog55 · 18th August 2008, 11:59 AM

Doug I just followed thru on that link, mine are same but slightly newer vintage, what do ya reckon 2nd order L/R at 200?? the jaycar 12's are smooth enough but I dont think first order will cut it,

Brisso57 · 18th August 2008, 12:04 PM

Quote:

Originally posted by Moondog55
Doug I just followed thru on that link, mine are same but slightly newer vintage, what do ya reckon 2nd order L/R at 200?? the jaycar 12's are smooth enough but I dont think first order will cut it,

I've not tried them with a subwoofer. I really liked them as a single driver. The point-source thing. Just wanted a bit of sizzle on top. I don't think they'll be metal rock speakers, but with Ricki-Lee Jones singing live on "Naked Songs" ... :-)

Doug

Brisso57 · 18th August 2008, 12:09 PM

Quote:

Originally posted by Moondog55
Doug I just followed thru on that link, mine are same but slightly newer vintage, what do ya reckon 2nd order L/R at 200?? the jaycar 12's are smooth enough but I dont think first order will cut it,

*** What if you got a second pair of 8WR's and set them as a 1.5?
ie close together vertically on the baffle, with the lower one a first-order low-pass?
Maybe enough bass without trying to blend two completely different drivers ...

?

Doug

PeteMcK · 18th August 2008, 09:54 PM

"2nd order L/R at 200?? " - I used 1st order at around 150 and didn't have a problem (3mH and 150uF), but 2nd order's only a couple of extra parts, try both...

Moondog55 · 19th August 2008, 04:42 AM

Hi Peter, that was my initial thought.
OK I'll try first on the woofer, second on the full range ( I have 3mH on the shelf, if I use standard values for the second order and use the 9mH coil I have, then that should be close enough for trial listening.
And if I need some top end sparkle I'd add that later

Brisso57 · 21st August 2008, 11:47 AM

Another pair of 8WR's have just appeared on fleaBay (Melbourne).
... if you wanted to try the 1.5 route ...

cheers

Doug

18th August 2008, 10:42 AM	#1
Moondog55 diyAudio Member Join Date: Jun 2007 Location: Norlane; Geelong: Victoria: Australia	OPEN BAFFLE QUERY for Aussies I just bought a pair of Magnavox 8WR speakers as a whim, they cost me a dollar. I have in the shed a panel of MDF 1220 X 450 and enough scrap to add wings about 300 deep. I also have 2 pair of "Jaycar" 12 inch paper cone woofers, I know that the stated power handling of the Jaycars is optimistic but the Magnavox will probably take 15-20 watts if I remove some of the bass and send most of the LF to the 12 inch woofers. I am actually surprised at how nice the Magnavox sound even if a little ragged. As a dedicated mid they may sound a little better. I'm asking for a little help with a simple crossover to suit this combination of drivers and baffle. They will be a gift for friends and I have spent as much as I can really afford so I'm hoping I can use what have in stock as far as inductors and caps go. Will a second order at around 200 be OK??? __________________ QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"

18th August 2008, 11:28 AM	#2
Brisso57 diyAudio Member Join Date: Sep 2005 Location: the leafy west of Brisbane	I've also toyed with a pair of 16ohm 8WR's. Wanting a bit more sparkle, I added a piezo supertweeter, using a cap for a 1st order XO. I used an L-pad on the piezo. No too bad. cheers Doug PS, did you see the 8WR's in the open-rear cabinet on fleaBay? __________________ A speaker-builder's parable: "That burned down, fell over, then sank into the swamp. But the fourth one stayed up. And that's what you're going to get, Lad, the strongest castle of all."

18th August 2008, 11:54 AM	#4
Moondog55 diyAudio Member Join Date: Jun 2007 Location: Norlane; Geelong: Victoria: Australia	Hi Doug, these were in a small 19litre sealed box and they are the 8Ohm version, I'll add a super tweeter if I need to. These were from Ebay but pick-up in Melbourne __________________ QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"

18th August 2008, 11:59 AM	#5
Moondog55 diyAudio Member Join Date: Jun 2007 Location: Norlane; Geelong: Victoria: Australia	Doug I just followed thru on that link, mine are same but slightly newer vintage, what do ya reckon 2nd order L/R at 200?? the jaycar 12's are smooth enough but I dont think first order will cut it, __________________ QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"

18th August 2008, 09:54 PM	#8
PeteMcK diyAudio Member Join Date: Feb 2002 Location: Sydney	"2nd order L/R at 200?? " - I used 1st order at around 150 and didn't have a problem (3mH and 150uF), but 2nd order's only a couple of extra parts, try both... __________________ ‘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


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19th August 2008, 04:42 AM	#9
Moondog55 diyAudio Member Join Date: Jun 2007 Location: Norlane; Geelong: Victoria: Australia	Hi Peter, that was my initial thought. OK I'll try first on the woofer, second on the full range ( I have 3mH on the shelf, if I use standard values for the second order and use the 9mH coil I have, then that should be close enough for trial listening. And if I need some top end sparkle I'd add that later __________________ QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"

21st August 2008, 11:47 AM	#10
Brisso57 diyAudio Member Join Date: Sep 2005 Location: the leafy west of Brisbane	More 8WR's on fleaBay ... Another pair of 8WR's have just appeared on fleaBay (Melbourne). ... if you wanted to try the 1.5 route ... cheers Doug __________________ A speaker-builder's parable: "That burned down, fell over, then sank into the swamp. But the fourth one stayed up. And that's what you're going to get, Lad, the strongest castle of all."

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