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Multi-Way Conventional loudspeakers with crossovers

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Old 5th March 2011, 07:43 AM   #341
Westy37 is offline Westy37  Australia
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Thanks for the fast response John and thank you for documenting this build. I whipped up a quick baffle for today using "jermone69's" slightly shorter baffle and an LCR trap for the woofers' break up node.

So far I'm pretty impressed. This speaker sucks up power like nothing else! But it's worth it for that balanced bass response. I'll post up some pictures when I get a chance and maybe start a new thread when I start tinkering with it a bit more.
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Old 5th March 2011, 01:02 PM   #342
Pano is offline Pano  United States
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Quote:
Originally Posted by Westy37 View Post
This speaker sucks up power like nothing else!
From that alone, I know you've done it right.

The low efficiency is the trade off you must make for good bass in an open baffle speaker of that size. Not many people realize this - at least judging by many of the open baffle projects I've heard. One nice thing about that Peerless woofer is that it can take the power needed.
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Old 6th March 2011, 12:11 AM   #343
Westy37 is offline Westy37  Australia
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Thanks for all your contributions to this thread Pano. I've realised that this is a trade off I'm more than happy to live with. The only other speaker I have to compare these with is some B&W 602 S3s and so far I'm putting the mini OB a good way in front. There is a beautiful clarity to the bass. Sure it doesn't delve down into 20hz territory but it's not designed to and it's more than adequate for my listening.

My next venture is likely to involve an attempt at a floorstanding version, slightly wider baffle using four of the peerless woofers (wow I've been impressed by these) crossed over actively to a 4-5" extended range driver (possibly an Alpair from the MarkAudio range) with a ribbon as a supertweeter coming in at 7-8k or thereabouts.
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Old 6th March 2011, 06:13 AM   #344
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Westy37
Big passive OB project
KS-009
(DIY archive of Kimmo Saunisto)

CLS
I know a French specialist (sorry in French but take a look to the schema)
Asservissement d'un HP - De la puce l'oreille
http://ddata.over-blog.com/xxxyyy/1/...ack_Ch3_M1.pdf
I saw result of the level of distortion in the bass 10x better. But I am not convinced because a lot of amplifiers can't supply current in the bass. The current feedback is just a compensation of lack of current. I don't want to hijack the thread. I stop talking about this.
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Old 17th March 2011, 03:17 AM   #345
dayvo is offline dayvo  United States
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For my second speaker project, I humbly submit these which are heavily influenced by this thread. They use the same Peerless SLS 12" woofers. The high frequencies are handled by CSS FR125SR's. Crossovers are active using a MiniDSP. The baffles are 15" wide by 32" tall with 24" tall side supports (winglets) that vary from 6" wide at the bottom to 2" at the top. Right now, the drivers are breaking in -- they have about 18 hours on them.

The crossover is centered at just over 200 hz for the initial set-up and PEQ filters in the MiniDSP are great for compensating for rising baffle response. They are basically flat down to 40 hz (but, as Pano and others have mentioned, you really have to pump the gain on the woofer amp to feed them with this sort of compensation).

So far, I'll just say that the bass is really tight and well defined. The mids and highs are also very detailed. They're very enjoyable to listen to -- not tiring at all. I love open baffle sound.

Thanks very much to everyone who has contributed to this thread. These aren't exactly Manzanitas, so if folks have any interest in discussing these further, let me know if I should set up a new thread or if it's okay to talk about them here.
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Old 17th March 2011, 04:36 AM   #346
Westy37 is offline Westy37  Australia
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Dayvo, those speakers look great! I trust that you're enjoying them. I would agree that there is something truly magical to OB bass using that SLS 12" peerless woofer.
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Old 17th March 2011, 05:38 AM   #347
Pano is offline Pano  United States
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Looks very nice! Thanks for posting.

Yes, that Peerless woofer is a great driver.
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Old 27th March 2011, 02:05 PM   #348
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Hi, thank you for this great Manzanita project.
I've been lurking at this thread for some weeks, waiting for that excellent+simple+affordable variation.
This would be my first DIY speaker project, and I hope my last for a long time, as I have little time & less knowledge to DIY different variations.

Manzanita looks as made to measure for me, but, besides cost issues, I have a big doubt, regarding to placement.
My listening room is very irregular, opening to other spaces. The left speaker would be placed at most 12' (30 cm.) to the side wall -now treated with a 24'x24' absorbing panel-.

Is/How could be this project viable in this room?
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Old 27th March 2011, 02:21 PM   #349
Pano is offline Pano  United States
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Hi! The side walls matter the least. As with all dipole speakers, the sound coming from the sides is the lowest. Behind the speaker is important, to the side is much less important.

12" off the side wall is not great, but a speaker like this isn't too sensitive to side walls. You'll need to experiment with it once you get it built.
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Old 5th April 2011, 04:07 AM   #350
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Any thoughts on an alpair7 on top
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