New Open Baffles (Gift for friends )

Moondog55 · 8th November 2008, 11:49 PM

Started these a while ago after buying some close-out drivers from J***** and loosely based on Gainphiles first OB.

Woofers ar Jaycar 10inch, midwoofer is a cheap Taiwanese copy of Pioneer full range and the tweeter is also from J****** and unfortunately seems to have been deleted from range.

I had to buy a couple of chipboard sheets from Bunnings but every thing else came out of the shed

http://farm4.static.flickr.com/3137/...f60ea6.jpg?v=0

http://farm4.static.flickr.com/3237/...ae81c0.jpg?v=0

http://farm4.static.flickr.com/3178/...6a8011.jpg?v=0
http://farm4.static.flickr.com/3047/...7bd84d.jpg?v=0

As work progresses I'll let people know what they sound like in real baffles, but to start with I'll use the XO worked out on the foamcore trial baffle

ttan98 · 9th November 2008, 01:53 AM

Looks like you have lots of space to work with.

Also I saw a completed set of speakers behind the current speakers you building, are they OB too?

Cheers happy buiding.

Moondog55 · 9th November 2008, 02:20 AM

Yes they are ssort of hybrid. OB but with a sealed low bass, sort of .05 way; I'm rebuilding them for the second time with new/different midranges.
i'm lucky I have a soundproofed room with broadband and 30 Amps clean circuit to play with, but it;s not that big 3000 X 5100mm and sloping damped ceiling

Moondog55 · 9th November 2008, 06:53 AM

Whoops, my mistake Otto, the speakers in the background are my party mid-range, 80 litre ~Aperiodic with 2 Tandy 10 inch and a Jaycar tweeter, not really audiophile just clear and loud, I was thinking of another photo from a previous post

Moondog55 · 13th November 2008, 04:15 AM

A quick coat of Acrylic house paint hides a multitude of sins, they look like they were made from scraps;;and they were

http://farm4.static.flickr.com/3185/...62a62f.jpg?v=0

http://farm4.static.flickr.com/3140/...468756.jpg?v=0

Sound much better than they look

pacificblue · 13th November 2008, 05:13 AM

Quote:

Originally posted by Moondog55
Sound much better than they look

Really? Then wait until the drivers and cross-overs are mounted

Moondog55 · 13th November 2008, 06:37 AM

Cheeky.
Never thought to qualify that statement, but they are
"OPEN BAFFLES"
after all

SimontY · 14th November 2008, 10:48 AM

Good work, are they playing nicely then? How did you tackle the crossover?

Simon

Moondog55 · 14th November 2008, 09:40 PM

Crossover has been developed by listening only, based on components already in the shed.
Not the quickest and best way to do it but it works ( for me anyway) just takes time.
I started with low cut off on the woofer then chose arbitrarilly the highest value inductor I had (9mH) used a calculated LR second order and then ajusted capacitor values until it sounded OK.
Luckily some of those old paper full range cheapies have a gradual rolloff with little peaking.
They were a little dull at the top end so I added a tweeter afterwardjust a 2uFcap in series.
Baffle was played with over a weekend or three until bass sounded the best.
The advantage of using foamboard for test baffles is the ease of playing with different baffle sizes and shapes.

I am so happy with the sound of these that I am going to start on a bigger version usinfg 12 inch woofers.

gainphile · 14th November 2008, 09:59 PM

Very interesting and serious project

. I'm going to the path of "smallest OB possible" these days myself...

8th November 2008, 11:49 PM	#1
Moondog55 diyAudio Member Join Date: Jun 2007 Location: Norlane; Geelong: Victoria: Australia	New Open Baffles (Gift for friends ) Started these a while ago after buying some close-out drivers from J*** and loosely based on Gainphiles first OB. Woofers ar Jaycar 10inch, midwoofer is a cheap Taiwanese copy of Pioneer full range and the tweeter is also from J**** and unfortunately seems to have been deleted from range. I had to buy a couple of chipboard sheets from Bunnings but every thing else came out of the shed http://farm4.static.flickr.com/3137/...f60ea6.jpg?v=0 http://farm4.static.flickr.com/3237/...ae81c0.jpg?v=0 http://farm4.static.flickr.com/3178/...6a8011.jpg?v=0 http://farm4.static.flickr.com/3047/...7bd84d.jpg?v=0 As work progresses I'll let people know what they sound like in real baffles, but to start with I'll use the XO worked out on the foamcore trial baffle __________________ QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"

9th November 2008, 02:20 AM	#3
Moondog55 diyAudio Member Join Date: Jun 2007 Location: Norlane; Geelong: Victoria: Australia	Yes they are ssort of hybrid. OB but with a sealed low bass, sort of .05 way; I'm rebuilding them for the second time with new/different midranges. i'm lucky I have a soundproofed room with broadband and 30 Amps clean circuit to play with, but it;s not that big 3000 X 5100mm and sloping damped ceiling __________________ QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"

9th November 2008, 06:53 AM	#4
Moondog55 diyAudio Member Join Date: Jun 2007 Location: Norlane; Geelong: Victoria: Australia	Whoops, my mistake Otto, the speakers in the background are my party mid-range, 80 litre ~Aperiodic with 2 Tandy 10 inch and a Jaycar tweeter, not really audiophile just clear and loud, I was thinking of another photo from a previous post __________________ QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"

13th November 2008, 04:15 AM	#5
Moondog55 diyAudio Member Join Date: Jun 2007 Location: Norlane; Geelong: Victoria: Australia	A quick coat of Acrylic house paint hides a multitude of sins, they look like they were made from scraps;;and they were http://farm4.static.flickr.com/3185/...62a62f.jpg?v=0 http://farm4.static.flickr.com/3140/...468756.jpg?v=0 Sound much better than they look __________________ QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"

13th November 2008, 06:37 AM	#7
Moondog55 diyAudio Member Join Date: Jun 2007 Location: Norlane; Geelong: Victoria: Australia	Cheeky. Never thought to qualify that statement, but they are "OPEN BAFFLES" after all __________________ QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"


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9th November 2008, 01:53 AM	#2
ttan98 diyAudio Member Join Date: Apr 2006 Location: Melb	Looks like you have lots of space to work with. Also I saw a completed set of speakers behind the current speakers you building, are they OB too? Cheers happy buiding.

14th November 2008, 10:48 AM	#8
SimontY diyAudio Member Join Date: May 2003 Location: Sheffield, North England	Good work, are they playing nicely then? How did you tackle the crossover? Simon __________________ Fave. threads: Marantz CD63 \| Philips CD650 \| my 3-way dipoles \| T-bass for dipoles \| EnABL treatment \| Arcam Alpha (CD)

14th November 2008, 09:40 PM	#9
Moondog55 diyAudio Member Join Date: Jun 2007 Location: Norlane; Geelong: Victoria: Australia	Crossover has been developed by listening only, based on components already in the shed. Not the quickest and best way to do it but it works ( for me anyway) just takes time. I started with low cut off on the woofer then chose arbitrarilly the highest value inductor I had (9mH) used a calculated LR second order and then ajusted capacitor values until it sounded OK. Luckily some of those old paper full range cheapies have a gradual rolloff with little peaking. They were a little dull at the top end so I added a tweeter afterwardjust a 2uFcap in series. Baffle was played with over a weekend or three until bass sounded the best. The advantage of using foamboard for test baffles is the ease of playing with different baffle sizes and shapes. I am so happy with the sound of these that I am going to start on a bigger version usinfg 12 inch woofers. __________________ QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"

14th November 2008, 09:59 PM	#10
gainphile diyAudio Member Join Date: Dec 2007 Location: Melbourne the sunny city!	Very interesting and serious project . I'm going to the path of "smallest OB possible" these days myself... __________________ http://gainphile.blogspot.com

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