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Author Topic: Back to Speakers... Again! (Dirt Cheap Open Baffle Speaker Project)  (Read 17364 times)

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Donald North

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Re: Back to Speakers... Again! (Dirt Cheap Open Baffle Speaker Project)
« Reply #50 on: February 12, 2014, 06:30:43 PM »

Your Sequence speakers are at the top of my list of things I want to hear most, Donald. Do you take them to shows?

I'm pretty much set on making the jump to speakers. It's mostly just a question of when now....

I haven't exhibited the Sequences at a show in years. I have them nicely setup at my home and you're welcome to come to Los Angeles and hear them here.
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Marvey

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Re: Back to Speakers... Again! (Dirt Cheap Open Baffle Speaker Project)
« Reply #51 on: February 12, 2014, 07:30:50 PM »

I'm still due over one of these days...
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OJneg

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Re: Back to Speakers... Again! (Dirt Cheap Open Baffle Speaker Project)
« Reply #52 on: February 12, 2014, 10:30:05 PM »

Did you try to chamfer the baffle cutouts? Or was it beyond your abilities/worries? I can't tell from the pics.
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Marvey

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Re: Back to Speakers... Again! (Dirt Cheap Open Baffle Speaker Project)
« Reply #53 on: February 13, 2014, 03:14:33 AM »

I chamfered (badly) one cutout of the 8" driver ... until I realized the construction of the frames in the back of both the 15" and 8" drivers did not necessitate such.
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Maxvla

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Re: Back to Speakers... Again! (Dirt Cheap Open Baffle Speaker Project)
« Reply #54 on: February 26, 2014, 07:04:39 AM »

Was visually bored while listening to music tonight and did some perfunctory searches about DIY open baffle and came up with several results I skimmed through but then came across an AVS thread that had a good discussion and read it in full. I didn't want to get into the nuts and bolts of open baffle, but wanted to see what happened when opinions clashed, as that is a good opportunity to learn from both sides. Take a look:

http://www.avsforum.com/t/1470169/open-baffle-speakers

One person mentions a proper OB setup is 4 drivers, dipole tweeters, a mid, and bass woofer a la Linkwitz Orion. I know Donald's Sequence is dipole on the bass woofer only so it's interesting to see how both of those setups can sound good. Something I also noticed on Linkwitz site was magnet mounting the mids driver to make it more nimble. Basically the cone side is not mechanically connected to the baffle, just a strip of foam type material to seal it, and the rear is magnetically attached to a metal plate that is secured into a wooden support. Something like this could be done on your setup, Marv, to make the full range driver more precise, if that is in fact what effect magnetic mounting has.

It's interesting to see all these OB designs. They seem more varied than sealed speakers or horns.

Something else mentioned in the AVS thread is that, contrary to what I imagined, OB speakers tend to have a smaller sweetspot, but that sweetspot is much sweeter than more traditional speakers due to the timed reflections more accurately imitating instruments that, of course, don't just radiate forward, but backward as well. This last point makes me even more curious about OB speakers as it seems box speakers killing or dramatically reducing backwave defeats the purpose of trying to sound real. Even ported designs don't do enough. Horns (of reasonable size/cost) try to use this effect, but the reflection comes from mostly the speaker's footprint, not the surrounding walls as it would with live musicians. I think this point has a lot to do with why I like my speakers I have now, but find them to be too cannon like in delivery and thus not all that realistic.
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DaveBSC

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Re: Back to Speakers... Again! (Dirt Cheap Open Baffle Speaker Project)
« Reply #55 on: February 26, 2014, 08:04:08 PM »

Something else mentioned in the AVS thread is that, contrary to what I imagined, OB speakers tend to have a smaller sweetspot, but that sweetspot is much sweeter than more traditional speakers due to the timed reflections more accurately imitating instruments that, of course, don't just radiate forward, but backward as well. This last point makes me even more curious about OB speakers as it seems box speakers killing or dramatically reducing backwave defeats the purpose of trying to sound real. Even ported designs don't do enough. Horns (of reasonable size/cost) try to use this effect, but the reflection comes from mostly the speaker's footprint, not the surrounding walls as it would with live musicians. I think this point has a lot to do with why I like my speakers I have now, but find them to be too cannon like in delivery and thus not all that realistic.

Keep in mind that many people with dipoles like OBs or ESLs try to essentially neutralize the back wave by lining the front wall with absorption. The idea that dipole = real and monopole = not real is just not accurate. The helpfulness of reflections, both from the front wall and side walls, is very dependent on when they arrive. If you place dipoles too close to untreated walls, the sound will be considerably worse than monopoles. Forward radiators are also capable of very wide, very stable sweetspots, particularly those with extremely narrow cabinets like the Dynaudio Confidence series. In terms of the sound absolutely filling the room and extending far beyond the speakers themselves, the Confidence C4 easily outperforms the VAST majority of dipolar panel speakers that I've heard.

True omnis like Duevels or MBLs more closely approximate how instruments behave than dipoles do, but there's usually a trade off there in terms of imaging. There really is no magic bullet.
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OJneg

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Re: Back to Speakers... Again! (Dirt Cheap Open Baffle Speaker Project)
« Reply #56 on: March 22, 2014, 12:59:24 AM »

Here it is finally. Going to evaluate the woofer before adding the mid/tweeter:



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Marvey

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Re: Back to Speakers... Again! (Dirt Cheap Open Baffle Speaker Project)
« Reply #57 on: March 22, 2014, 02:04:34 AM »

Haha nice!
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Maxvla

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Re: Back to Speakers... Again! (Dirt Cheap Open Baffle Speaker Project)
« Reply #58 on: March 22, 2014, 02:26:42 AM »

Bet those sound just like LCD-2s as is.
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Marvey

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Re: Back to Speakers... Again! (Dirt Cheap Open Baffle Speaker Project)
« Reply #59 on: March 22, 2014, 02:49:00 AM »

LMAO! You really crack me up sometimes.
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